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PDF Content Summary: Electro-Voice OPERATION MANUAL & SERVICE INSTRUCTIONS MODELA P 2 8 0 0 COLO 00 : 00 YO ACHANE 2 24:2: :00 CS: DUAL LOAD POWER AMPLIFIER WWWWWWWWWWWW XX . X . X .: Es de ANAS die . .PERSWALLOWING SERIE COBISSASSIN S ROSES DANS LES RESERVAS WO Sex N NEMAR NSORENOBLESSINA S A NOSSA DES NO SESSORS i do. S AWARDS TERRITOR IO SE DOWN ANY RESERVAS . WWW B ON BIBYTEROXX DE ERSAXOXO BUSSERENDO WERDER BRUSSEX E .02. 2 003 PRESSUR SE394332AX AL VERS BEAVESCOR ES DERSOS CHANNEL 2 :25 XUM 20 com XXXWWW WWW HIND : BELLA ANUP HUNTCOD . . 00 2 . Wesen 1318 EXCLU SIVE SEXE NE SANDRA S WEB ON: WESS SERVER SUNNAN CORO XX X . . WAREMOS PREVODOX SENSOREN LE D DNESNIEN WAARMANN BUXNXXBORA WATAN ENLAR N SAVASARIO M S TRANSPORTE : A NTES SEE MORE RECORDS : WOMEN 45 SAANEER 02: WERDEN KANSSASSI NAMENILOXANEWS. XX.XXX BANYO . T ORITOS: RORUSSIA D ADORA DESDEXCORT DOLA A SOSS: XSARASESORAMI LINHAS ENTORN XXX PORNOEN E N . . . . .! DE ...... BESORADOR E S S :3 XNXX :X NOR S .2008 LAND .: SOSTENIBLES. DESSUADORE OG SOSIALE MEDIERXWEDDOLORE GATES AROUSERS COURS E BORSE ERE D HUBBALLOS DERIN SS. SHERS Electro-Voice Electro-Voice Operation Manual for the Model AP2800 PAGE TABLE OF CONTENTS PRODUCT DESCRIPTION UNPACKING PRECAUTIONS SPECIFICATIONS POWER CONSUMPTION AND THERMAL DISSIPATION INPUT MODULE AND LINK CONNECTIONS BRIDGING TRANSFORMER OPTION OUTPUT CONNECTIONS, CONFIGURATIONS Dual Mode Parallel Mono Bridged Mono ILLEGAL MODE 70 VOLT OPERATION INSTALLATION VENTILATION OUTPUT CABLE SELECTION CALCULATING POWER LOSSES DAMPING FACTOR & CABLE LENGTH SPEAKER PROTECTION SERVICE INSTRUCTIONS INPUT CARD PIN ASSIGNMENTS SCHEMATIC/INPUT BOARD FACTORY SERVICE TECHNICAL SERVICE ACCESSORIES TABLES AND ILLUSTRATIONS PAGE INPUT MODULE AND LINK CONNECTIONS ILLUSTRATIONS Figure 1 Connections for balanced or unbalanced signal sources 6 Figure 2 Internal jumpers for accessories, link and gnd Jumper Figure 3 Input grounding options Figure 4 Inserting an external device internal connections Figure 5 Inserting an external device external connections Figure 6 Optional accessory link-out connections OUTPUT CONNECTION ILLUSTRATIONS Figure 8 Dual mode configuration Figure 9 Parallel mono configuration Figure 10 Bridged mono configuration Figure 11 Optional protection fuse connection 13 Figure 12 BIAMP connection with driver protection capacitor SERVICE INSTRUCTIONS Figure 13 Access screws Figure 14 DC bias and IT calibration trim pot locations Figure 15 Idle current trim pot locations TABLES 1. H-Pad Resistance Values using 1% resistors II. Power losses per foot in 2-wire speaker cable III. DC resistance for 2-wire cable IV. Speaker protection fuse chart V. Protection capacitor sizes for common cross-over frequencies 13 11 13 14 18 12 19 20 20 20 Uniform Limited Warranty Statement Electro-Voice products are guaranteed against malfunction due to defects in materials or workmanship for a specified period, as noted in the product-line statement(s) below, or in the individual product data sheet or owner's manual, beginning with the date of original purchase. If such malfunction occurs during the specified period, the product will be repaired or replaced (at our option) without charge. The product will be returned to the customer prepaid. Exclusions and Limitations: The Limited Warranty does not apply to: (a) exterior finish or appearance; (b) certain specific items described in the individual product-line statement(s) below, or in the individual product data sheet or owner's manual; (c) malfunction resulting from use or operation of the product other than as specified in the product data sheet or owner's manual; (d) malfunction resulting from misuse or abuse of the product; or (e) malfunction occurring at any time after repairs have been made to the product by anyone other than Electro-Voice® Customer Service or any of its authorized service representatives. Obtaining Warranty Service: To obtain warranty service, a customer must deliver the product, prepaid, to Electro-Voice® Customer Service or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice. A list of authorized service representatives is available from Electro-Voice® Customer Service at 600 Cecil Street, Buchanan, MI 49107 (800-234-6831 or FAX 616-695-4743). Incidental and Consequential Damages Excluded: Product repair or replacement and return to the customer are the only remedies provided to the customer. Electro-Voice shall not be liable for any incidental or consequential damages including, without limitation, injury to persons or property or loss of use. Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you. Other Rights: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Electro-Voice Electronics are guaranteed against malfunction due to defects in materials or workmanship for a period of three (3) years from the date of original purchase. Additional details are included in the Uniform Limited Warranty statement. Electro-Voice PRODUCT DESCRIPTION The Electro-Voice model AP2800 amplifier is designed for direct voice-coil drive and/or 70.7-volt distributed systems. Each channel can be independently configured for 70.7-volt line operation or 8/4-ohm systems. The two channels together can be paralleled or bridged for driving a single load. This series features an ultraquiet continuously variable cooling system which pulls air from front to back. An air filter is provided and can be removed from the front for cleaning. The input module is removable and provides internal connections for signal processing accessories and input transformers. There are also provisions for input grounding options and an H-pad for attenuation and impedance matching. XLR connectors and removable screw terminal connectors are standard. There is an additional connector provided to allow the user to link internal optional accessories such as power limiters, filters or cross-overs to the input of other amplifiers in the system. This allows for example the implementation of stereo two-way or mono three-way cross-overs within a single standard input module. This can be expanded between two amplifiers to provide stereo three-way or mono five way cross-overs. Optional control modules replace the standard input module to allow compatibility and connection to an Interactive Technology network. Each channel is protected against load shorts, over-temperature and output dc. The front panel indicators provide signal present, signal clip and standby for each channel as well as a power on indicator. ANAS NAALSEDA POUCATARRILAREN BA R RIER WALDOR MEXXXSURBINA. MY W ORL D DENNE S A MYXXXXXXXXXXXXX XXX PRENDREXAS RANSEBESKERDADEIRO EXPRESS MAN S END IRMWARE ADOBLAMA XXXXXXXXXXXXX.....: XXX X XXXXX M WWWWWWW WWWWWE . .... . . . A RIAMENTE DESARRONES NUNSULADONINISHWWWLAN WERE M : LOND O NBANESES BEVORDERINNEN SANDRA KARYA DW E WYWROVIDE KANNYA MASSEY .68333D W WWW TXARRAT AKO W YBORU : VW MBAS V ERY MARION SONIERE WASHARMA caw NOW XXX Worten NEW YE A RS EXEMBOURG BARVYXNXX. XXXX WEES VERTRETENDE N MYANMAR NAMIBIA ESIMAMISHW A SERIKALBASTRES MAXWX BOX ONE SENSORS:::WWW XXXXXX M ODIDOMIDOMOSOUDUINOOR O NDON E SIA LEXXX.COM SERIKSEN CREATED SARAS SENARANCSNERS: KONSERNY TABERECHNET WE RP S LOWENTES IN NASRARASSANESE N EMA XXXNNN . UNDER LOOMAD XXXX YOSHITS www . de NOVA !!! DSN.NORDEN Kate EXCURSOS OUTE HMS EM 1 REMIX SMANN * LANTS . DO TOP H OTELES ILULLIN SPALVOS . PH 353 UNPACKING This shipping carton is specially designed to protect the amplifier while transporting under normal conditions. It is still possible for damage to occur so carefully inspect the outside carton for signs of abuse. If for any reason the amplifier should be returned, use the shipping carton that it came in. Electro-Voice cannot warranty against damage that occurs as a result of improper packaging. PRECAUTIONS Do not replace the fuse with a higher amp rating than what is specified. There are various circuits inside that detect fault conditions and place the amplifier in standby (indicated on the front panel by the amber LEDs). A blown ac panel fuse indicates a more severe problem such as a transformer failure. An oversized fuse installed under these conditions can lead to a possible fire hazard. There is a thermal fuse located inside the transformer primary windings to protect against unusual conditions that the amplifier fault logic may not sense. For example, a leaky power supply capacitor can cause excessive current to flow therefore heating up the transformer, yet the amplifier appears to perform normally. If the amplifier is operating under extreme conditions that cause the transformer to overheat, it is possible for this thermal fuse to trip before either the back panel fuse blows or the amplifier engages a standby condition. In this case, the internal transformer fuse will remain open (no power) until the temperature inside the transformer drops to a safe level. At that time the fuse will close and power will again be applied. This shut-down condition can be recognized by a total power lost even though the panel fuse is good. This contrasts against a thermal shut-down by the fault logic where the power and stand-by LEDs on the front panel are brightly lit and the internal fan may be running. Electro-Voice HONE Electro-Voice Operation Manual for the Model AP2800 WWW SPECIFICATIONS RATED POWER specifications are for <0.1% THD, 20-20kHz, both channels driven (30kHz measurement bandwidth). FULL POWER specifications are for 0.1% THD @ 1 kHz, both channels driven (30 kHz measurement bandwidth). AP2800 500 (548) 400 (437) 400 (460) RATED POWER IN WATTS Full power in paranthesis Dual Mode 4-ohm 8-ohm 70-volt Parallel Mono 2-ohm 4-ohm 8-ohm 70-volt Bridged Mono 8-ohm 16-ohm 140-volt 1000 (1060) 800 (854) 400 (511) 800 (915) 1000 (1120) 800 (870) 800 (910) FREQUENCY RESPONSE 10 Hz to 80kHz (ref. 1kHz, 1 watt output, + 0/-3 dBr) POWER BANDWIDTH 20Hz to 20kHz (ref. 1 kHz, +0/-.5 dBr where 0 dBr = rated output power in any mode) VOLTAGE GAIN: (ref. 1 kHz) AP2800 Dual Mode 4/8-ohm 37.2 dBu 70-volt 39.2 dBu Parallel Mono 2/4/8-ohm 37.2 dBu 70-volt 39.2 dBu Bridged Mono 8/16-ohm 43.2 dBu 140-volt 45.2 dBu SIGNAL TO NOISE: > 100 dBr (A wtd.) measured below rated output SENSITIVITY 8 ohm/70 V / 140 V 422 Dual 202 Par 822 bridged AP2800 0 dBu (0.775 Vrms) -2 dBu (0.616 Vrms) -2 dBu (0.616 Vrms) -2 dBu (0.616 Vrms) 4 Electro-Voice INPUT IMPEDANCE: SOURCE IMPEDANCE: CROSS TALK DC OFFSET: SLEW RATE: DAMPING FACTOR: AC POWER: MINIMUM AC VOLTAGE: 15k Ohms 0.032 Ohms <-70 dB at 1 kHz Less than 10 mV 15 V/us > 300 (1 kHz, 8-ohm) 120 V ac / 60 Hz 95 V ac / 60 Hz 43 PHYSICAL: Depth: Width: Height: Weight: Shipping Weight: AP2800 16.75 in. (425.5mm) 19 in. (482.6mm) 5.25 in. (133.4mm) 49.5 lb (22.45 kg) 53.87 lb (24.42 kg) POWER CONSUMPTION AND THERMAL DISSIPATION The following tables provide guidelines for estimating heat dissipation of the amplifier, given it's intended application. This data is based on the following equation: AP2800 Line Current, Power Consumed/ Dissipated and Output for selected applications Application: Idle Load L ine Current (A) Pac (W) PId(W) Pdi (W) Btu/Hr Kcal/Hr 2 ohm Parallel 1.11 43 148 37 4 ohm Dual 1.09 420 42 144 36 8 ohm Dual 48 0 48 165 41 8 ohm Bridged 1.13 47 0 47 161 40 70 V Dual 1.19 530 53 182 45 70 V Parallel 1.11 460 46 158 39 140 V. Bridged 1.13 48 0 48 165 41 Application: Paging/Background Music Load L ine Current (A) Pac (W) Pld (W) Pdi (W) Btu/hr Kcal/Hr 2 ohm Parallel 1.66 104 0.91 104 356 88 4 ohm Dual 1.68 110 0.91 109.09 374 93 8ohm Dual 1.43 630.73 82.27 282 70 Bohm Bridged 1.68 110 0.91 109.09 374 93 70 V Dual 1.48 90 0.73 89.27 306 75 70 V Parallel 1.44 84 0.7383.27 286 71 140 V Bridged 1.48 90 0.73 89.27 306 76 Application: Continuous Speech Load L ine Current (A) Pac (W) Pid(W) Pdi (W) Btu/Hr Kcal/Hr 2 ohm Parallel 326 261 10 251 860 213 4 ohm Dual 331 264 10 254 870 215 8 ohm Dual 2.46 1838 175 600 149 8 ohm Bridged 325 25910 249 853 211 70 V Dual 2.47 1858 177 606 150 70 V Parallel 2.45 180 8 172 589 145 140 V Bridged 2.48 1658 177 606 150 Application: Dynamic Load Line Current (A) Pac (W) PID (W) Pdi (W) Btu/Hr Kcal/hr 2 ohm Parallel 6.72 592 65 527 1804 446 4 ohm Dual 6.81 597 65 532 1822 451 8 ohm Dual 4.68 394 52 342 1171 290 8 ohm Bridged 6.71 589 65 524 1794 444 70 V Dual 4.69 392 52 340 1164 288 70 V Parallel 348 1192 295 140 V Bridged 4.75 394 52 342 1171 290 Application: Full Music Power Load Line Current (A) Pac (W) Pld (W) Pdl (W) BtwHr Kcal/hr 2 ohm Parallel 9.73 893160 7 33 2510 621 4 ohm Dual 9.8 901 160 741 2537 627 8 ohm Dual 6.71 588 128 450 1575 390 8 ohm Bridged 9.7 890 160 730 2499 618 70 V Dual 6.71 582 128 454 1555 385 70 V Parallel 6.93 597 128 459 1605 397 140 V Bridged 6.77 5 86 128 458 1565 388 Pdis = Pac - Pld Pdis = Power Dissipated in Watts Pac = True AC Mains Power in Watts Consumed Pld = Total Average Power Delivered to the Load The applications are as follows: 4.82 Idle: The amplifier is on with no signal present. Paging/Background Music: The amplifier is operating with one second announcements (at full power) every 15 seconds or back ground music which is attenuated -32 dBr. Continuous Speech: The amplifier is operating with continuous speech that is attenuated -23 dBr. Dynamic: The amplifier is operating with a dynamic input signal such as a motion picture sound track or classical music. Loud passages are at full power, soft passages are equivalent to continuous speech. Full Music Power: The amplifier is operating with continuous music input at rated output to the load with only occasional clipping. Conditions for following measurements: Line = 120 Vac / 60 Hz . Both channels driven equally and with equal loads for dual mode measurements INPUT MODULE AND LINK CONNECTIONS Balanced input connections may be made to either the three-pin screw terminals or the XLR connectors. The screw terminal connections are internally wired directly to the XLR pins. XLR pin 1 corresponds to the screw terminal marked with a ground symbol. XLR pins 2 and 3 correspond to the terminals marked "+" and "_"" respectively (refer to input board schematic on page 19). Figure 1 illustrates two types of connections to the input module using the detachable 3.5 millimeter plugs that are provided as part of the accessory kit. The first connection shown is for interfacing to a balanced signal source. The source generates two signals (+ and - ) and provides a ground reference for shielding. The optimum ground reference for this configuration is the chassis ground of both the source device and the amplifier. This configuration requires that the internal ground jumper is set in either the "CHAS GND" position or the floating position (see figures 2 and 3). The second connection Electro-Voice BRARY Electro-Voice Operation Manual for the Model AP2800 LOYE shown in figure 1 is for an unbalanced signal source. Since the "-" of the unbalanced signal source is also the signal-ground, the "-" terminal of the amplifier must be referenced to this same point. The internal ground jumper must be in the "SIG GND" position for all unbalanced connections (see figures 2 and 3). The balanced and unbalanced connections shown in figure 1 can also apply to XLR connectors. If you are using XLR connectors and you intend to float the shield, be sure you are not inadvertently connecting the chassis ground to the cable shield through the fourth connection of the XLR connector. Some XLR connectors provide a fourth connection to the metal housing which will connect to the chassis ground of the amplifier when plugged in. GND + - + BALANCED SOURCE UNBALANCED SOURCE Figure 1 Connections for balanced or unbalanced signal sources. XLR PIN 1 GROUND JUMPER To help facilitate various grounding connections for pin 1 of the XLR connectors (and the input terminal ground), a three pin jumper is provided on the standard input module (figure 2). This jumper connects pin 1 of both XLR connectors to either the chassis ground (indicated by CHAS GND) or signal ground indicated by SIG GND). The unit is shipped with pin 1 connected to the chassis (Figure 3). This position of fers the best isolation from ground loops and noise if you use a uniformly shielded twisted pair cable that does not include a drain wire. A third option is to float the input ground by removing the jumper completely (Figure 3). This will break ground loops but may not offer good shielding unless the signal source provides a good ground for the cable shield. You should only use the signal ground position if you are using unbalanced signal sources. CHANNEL TWO ACCESSORY J6 AMP CHANNEL ONE ACCESSORY J5 B.I.S. OUT O . CH11 AHP B.I.S. OUT CHA . . a INPUT GND 00€ DIS SVHS GND GND LINK CONNECTOR Each channel of the standard input module provides the user with a flexible three pin link connector. There are two primary functions that the link connector performs. (1) It provides a way to insert an external signal processor into the signal path by isolating the entire balanced input stage from the unbalanced input to the amplifier. (2) It provides buffered outputs for the optional accessories that plug into the standard input module. The pin marked 'A' of each link connector is hard-wired to the output of the optional accessory module (figure 6). The pin marked 'B' is unassigned. This pin ties to a header (P1 for channel 1, P2 for channel 2) inside the standard input module and is not connected to any circuit in the board (figure 2). The center pin of the link connector is hard-wired to the analog signal ground and is used as the ground reference for all link connections to external components (refer to input board schematic on page 19). Figure 2 Internal jumpers for accessories, link connector and ground jumper. INSERTING EXTERNAL SIGNAL PROCESSORS INTO THE SIGNAL PATH You can isolate the entire balanced input stage for each channel by removing the jumper J5/ch1 or J6/ch2. The output of this stage is marked on the pc board as 'B.I.S. OUT CH1' or 'B.I.S. OUT CH2' (figure 2). This signal can be brought out of the module via the 'B' pin of the Link connector by patching 'B.I.S. OUT CH1 or CH2' to the post header of P1 or P2 that is marked 'B' (figure 4). The accessory kit that is included with the amplifier contains several post-header terminals that can be used to build shorting jumper wires. The signal can be returned via the 'A' pin of the Link connector since it is hard wired to the unbalanced amplifier input. The ability to insert signal processors such as filters, equalizers and compressor/limiters allows the user to take advantage of the features of the balanced input stage (i.e. H pad, transformer isolation and ground selection) which is not likely to be available on most signal processing equipment. Figure 5 shows how this feature can be used to insert an equalizer into the audio path for channel one using the internal connections shown in figure 4. INPUT GND CHAS SIG GND GND INPUT TJ7 GND TIT CHAS SIG GND GND INPUT 17 OND CHAS SIG GND GND NORMAL (BALANCED) FLOATING UNBALANCED Figure 3 Input grounding options, Electro-Voice 013 ced without replacing the city CH1 DHOFTING WAE APS HARD-WIRED TO JE AMPINANG PROMOUS THE AUDIO RETURN P1 BRIDGING TRANSFORMER OPTION The 7100 Series input module can be transformer balanced without replacing the input card. An optional ITM transformer will provide isolation from the source equipment. When the ITM Transformer is used in conjunction with the on-board H PAD connections, any combination of attenuation and matching configurations can be achieved. For more information see H-PAD. To insert external device (Channel One): H-PAD 1. Remove shorting jumper at J5 The standard input module provides the user with the ability to insert an H-Pad 2. 2. Connect a user-supplied shorting wire into the input signal path. This circuit can be used to attenuate input signals prior from P1-B to J5-B.I.S. out Ch1. to the optional bridging transformer (ITM) and/or the active circuitry in the input a 3. See Figure 5 for external connections module (refer to input board schematic on page 19). The H-Pad can also be designed to match the source impedance in addition to attenuating the input. Table 1 lists Figure 4 Inserting an external device resistor values to use in the H-Pad for typical loads of 15k and 600 ohms. (channel-one internal connections). TABLE 1 H-Pad Resistance Values Using 1% Resistors Desired Attenuation Resistor Values for Pad in Ohms (6002) RH1_RH2RH3RH4 RH5RH6 -20 dB 243 243 604 -15 dB 210 210 221 210 210 604 AUDIO INPUT (CHANNEL 1) -10 dB 422 O dB short short short short 604 243 121 243 154 154 154 154 604 CILA DOLINPUT CHAN open Desired Attenuation (15 k) SEE FIGURE 4 FOR INTERNAL CONNECTIONS -20 dB -15 dB -10 dB O dB Resistor Values for Pad in Ohms RH1RH2RH3RH4RH5RH6 6190 6190 3 010 6190 6190 open 5230 5230 5490 5230 5230 open 3920 3920 10600 3920 3920 open short short open short short open RETUAN BEND HH SIDE Conversion to Balanced-T-type attenuator The H-Pad may be converted to a balanced-T-type attenuator by replacing resistor RH3 with resistors RH7 and RH8 where RH7 = RH8 = RH3 /2. Figure 5 Inserting an external device (channel-one external connections). Calculating the Resistor Values for Other Attenuation Losses Other losses may be calculated using the following formulas: RH1 = RH2 = RH4 = RH5 (ZL)(VN - 1) 2 (N + 1) RH3 2 (ZL)(IN) (N-1) CHANNEL 2 INPUT CHANNEL 1 INPUT RH6 = Z -60 dB LEVEL N = terminating impedance (usually 60002 or 15k) ECE Z = 10 (Loss in dB/10) CHANNEL 2 ACCESSORY OUTPUT CHANNEL 1 ACCESSORY OUTPUT Figure 6 Optional accessory link-out connections. Electro-Voice 7 Electro-Voice Operation Manual for the Model AP2800 Caution: Replace output cover after speakers are connected. Do not expose bare wires and terminals. OUTPUT CONNECTIONS, CONFIGURATIONS Speaker output connections are made to the four-terminal barrier-strip connector located below the input module. The output configurations are determined by the three-position mode switch located to the right of the input module, and the load switches located to the left of the input module. CHANNEL 2 INPUT CHANNEL 1 INPUT MODE SWITCH: CENTER POSITION POWER DI1LDID CHANNEL INPUT CHANNEL 1 INPUT உLITE WUT LOS LLLLLL TE li TY LCU TUI TIPO HULT LL HOME MOH DIE LTH LI HE HAY WILDE VEEL PE 40 MINIMUM 4 MINIMUM Figure 8 Dual (Stereo) Mode Connections Dual Mode - In this configuration the amplifier is operating as two independent power amplifiers. Each speaker load can be independently configured for 8/4 ohm or 70-Volt line operation using the load switches located to the left of the input module (Figure 8). CHANNEL 2 INPUT NOT USED CHANNEL 1 INPUT ONLY MODE SWITCH: LEFT POSITION PER CHILD CLOUD HHH EINUT GHANEL1 INPUT TW LT LA MET IN LILLTUR LEGALO CH CULTOR TAWK FLETIT Pred LTH PALL 122 ULLORE Dll AIDETTE LOTLARINI LOUHO VETVET ATTU YOUR kor JUMPER 20 MINIMUM BOND MONDE Figure 9 Parallel Mono Connections WWWXXXXXX WARNING: The load switches must be set in tandem when operating in parallel mono mode. If one load switch is set for 70 volt and the other is set for 8/4 ohms while in this mode, the protection logic will disable channel ane. See ILLEGAL MODE" for more information, re intormation... Parallel Mono - This configuration provides the means to increase the current delivered to a single speaker load by shorting the outputs together (Figure 9). Both channels are combined to create one power amplifier that has the equivalent power capacity of both channels. Do not make the mistake however of assuming that for example, an AP2800 in parallel mono mode driving a single 8-ohm load will deliver 800 watts. It will still deliver 400 watts with a 0 dBu input signal. The advantage of parallel mono is the ability to double the power into a 4-ohm load (800 watts) as well as deliver still more power into 2 ohms (1000 watts) without overheating or current limiting. For distributed 70-volt line applications, parallel mono mode allows FE BMW XXX ISISSAADUD Electro-Voice loading the amplifier for the full rated power of both channels on a single 70-volt line. The signal source is connected to the channel-one input only. The channel-2 input is disabled. CHANNEL 2 INPUT NOT USED TURN CCW CHANNEL 1 INPUT ONLY MODE SWITCH: RIGHT POSITION QILAD CELAL SPUT CHANNEL 1 HPUT PEMULA LD HE LEVEL CO GAUTION LLUT LISTIIL HOOG HERETHE LLLLLL L This CHE GE LE H TE DE PE LUNEET UTIE CAUCHES LGTCİL DOLORRILLOT NORD LINE MTNL Bag WATT N ULLENE do MINIMUM Figure 10 Bridged Mono Connections BOOST XXX BBMALNXWROOM ONCOMPRA X X Bridged Mono - In this mode a single speaker load is connected across the amplifier outputs (Figure 10). For proper operation the signal source is connected to the channel-one input. The channel-two input level should be fully counterclockwise. In this mode the amplifier is providing a true balanced output. MO WEB: WWW O We SEM X OS 0 For 8/4-ohm load configuration, the load impedance should not be less than 8 ohms. A 70-volt load configuration in bridged mono mode allows driving a 100 volt distributed system or a 140-volt system. CAUTION: Unlike the other modes where the speaker load has one terminal connected to ground, bridged mono mode provides a differen tial "floating" signal to the speaker load and there fore any test equipment that is used to measure this signal should also *input sensitivity must be adjusted to -3 dBu (0.549 Vrms) WS SOME XXX e have a floating ground OBVOD WORLD * W*XXXXXXXXXXXXXXXXXXXX SIDER ILLEGAL MODE PROTECTION Illegal mode protection is provided to guard against an improper mono-mode setting. When the amplifier is set in either bridged or parallel mono, both channels are combined as one power stage to drive the speaker load. It is necessary that each amplifier's load switch is configured identically since it is driving the same load. To avoid problems, the protection logic will sense an improper condition and disable both channels. Both channel 1 Standby LEDs on the front panel will turn on. In addition the "ILLEGAL MODE" LED on the rear panel will also turn on. The amplifier will remain in this mode until both load switches are identically set, or dual mode is selected. SONNENBO W USADOWNO WARNING: The load switches must be set in tandem when operating in bridged mono mode. If one load switch is set for 70-volt while the other is set for 8/4 ohms while in this mode, the protection logic will disable both channels. See "ILLEGAL MODE PROTECTION" for 70 VOLT OPERATION 70-volt line operation provides a means to drive multiple sets of speakers without the confusion and complexity of adjusting the final load impedance. The term 70 volt refers to the output rms voltage delivered by the amplifier (it is actually 70.7 Vrms). By comparison, the output voltage for an AP2800 into an 8-ohm load with an input of 0 dBu is 56.6 volts rms. When the amplifier load switch is changed to the 70-volt position, two things happen. One is that the gain is increased so that an input of 0 dBu results in an output of 70.7 volts rms. The second is that the amplifier power supply voltage is adjusted to accommodate this output level. DES Ore normation BRANDWON PANNAB *3 : QUAND Electro-Voice Electro-Voice Operation Manual for the Model AP2800 WARNING: Do not use the 70-volt position as a method for increasing gain to a low impedance load. When the supply voltage is increased for 70-volt operation, there must be a corresponding increase in the load impedance. Otherwise the resulting high voltage and increased current will cause the amplifier to overheat and shut down. This type of system requires a speaker that includes a small power converting transformer. Each speaker is rated not by its load impedance but by the power that it consumes from the amplifier. For example, if you have speakers that have a 70-volt rating of 10-watts each then you can parallel fourty of these speakers to each channel of a AP2800 amplifier. The total power is evenly distributed among each speaker. Even if several speakers are disconnected from the line, the remaining speakers will still only consume 10 watts each. The power can also be unevenly distributed. For example ten 20-watt speakers can be paralleled with twenty 10 watt speakers as long as the total power does not exceed that of the amplifier that is driving the 70-volt line. In this case each 20 watt speaker will be 3 dB louder than the 10 watt speakers. The relatively high impedance of a 70-volt line allows longer cable runs to remote speakers (see "OUTPUT CABLE SELECTION", "CALCULATING POWER LOSSES" and "DAMPING FACTOR" for more details on the affects of cable length on a speaker system). Any amplifier that drives a 70-volt line must be capable of providing an output of 200 volts peak to peak. This is why many amplifiers require expensive step-up transformers. The AP2800 can drive the 70-volt line direct without using step-up transformers. A 140-volt system can be directly driven using the bridged mono mode. A 100-volt system can be driven in bridged mono mode if the input signal is reduced to -3 dBu (0.549 V rms). A 100-volt system would require speakers that are designed with transformers that have a 100-volt input tap. Likewise a 140-volt system would require speakers that are designed with transformers that have a 140-volt input tap. INSTALLATION The amplifier may be installed in a standard 19 inch equipment rack. The AP2800 requires 133.4 mm (5.25 in.) of vertical rack space and 425.5 mm (16.75 in.) of depth. The amplifier secures to the rack cabinet with four rack mount screws and cup washers provided in the hardware kit. REK WARNING: Do not operate the amplifier within a completely closed unventilated housing VENTILATION The amplifier must be adequately ventilated to avoid excessive temperature rise. The air is drawn from front to back therefore a rear ventilated cabinet should be used. If the amplifier shuts down due to elevated temperatures then the equipment should be spaced at least 44 mm (1.75 in.) apart or a blower installed to provide sufficient air movement within the cabinet. 10 Electro-Voice OUTPUT CABLE SELECTION Speaker wire size plays an important part in quality sound systems. Small wire gauges can waste power and reduce the damping factor at the speaker terminals. This can add coloration and muddiness to the sound. To help offset this problem Tables II and III have been assembled to enable you to calculate the power losses in the speaker cable. CALCULATING POWER LOSSES To calculate the total power loss in the speaker cable, multiply the power loss per foot of the 2-wire cable using the appropriate table below by the length of the cable in feet. For example, suppose an installer uses 160 feet of 12 gauge 2-wire cable with an 8-ohm speaker system connected to a AP2800 amplifier. The total power loss in the cable is: Total Power Loss = 0.162 watts/foot x 160 feet = 25.9 watts Does this mean that whenever the amplifier produces 400 watts of output power, 374.1 watts (400 watts minus 25.9 watts) will be delivered to the 8 ohm load? NO! The actual load impedance is 8 ohms plus the resistance of the cable (0.00324 x 160 feet + 8 = 8.52 ohms). Because of the change in the load impedance, the actual total power produced by the amplifier is 374.1 watts. The power delivered to the load is approximately 374.1 watts minus 25.9 watts or 348.2 watts. TABLE II AP2800 Power Losses per foot in 2-wire Speaker Cable 2 (1000W) 4 (500W) 8 (400W) 16(200W) AWG 8 (1000W)** 0.405 0.101 0.041 0.005 8 0 .605 0.151 0.061 0.008 10 1.020 0.255 0.102 0.013 1.620 0.405 0.162 0.020 2.575 0.644 0.258 0.032 4.095 1.024 0.410 0.051 6.510 1.628 0.651 20 10.350 2.588 1.035 0.129 * Parallel Mono **Bridged Mono 7OV (400W) 140V (800W)** 0.026 0.040 0.067 0.106 0.168 0.267 0.425 0.676 18 0.081 Electro-Voices Electro-Voice Operation Manual for the Model AP2800 DAMPING FACTOR The higher the damping factor of an amplifier, the greater the ability of the amplifier to control unwanted speaker cone movements. When a signal drives a woofer, current flowing through the voice coil creates a magnetic field. This field interacts with the permanent magnetic field in the gap and forces the combination cone and voice coil assembly to move outward. When the signal is removed, the assembly moves inward but its momentum causes it to overshoot its resting point. This overshoot will dampen itself out eventually but the unwanted movements can add considerable distortion to the sound. In the process of moving inward through the magnetic field, the voice coil assembly generates a current of opposite polarity to the original signal. This current induces a voltage or "back EMF" which travels through the speaker wire to the amplifier's output. The lower the amplifier source impedance, the faster the overshoot of the voice coil will dampen out. The source impedance of an amplifier can be calculated by dividing the rated output impedance, typically 8 ohms, by the damping factor. The source impedance of the AP2800 is 0.032 ohms. Cable Selection for Specified Damping Factor at the Load. The damping factor rating of the amplifier is typically never realized at the load because of the resistance of the cable. The damping factor at the load should be 30 for general paging systems and 50 for high-fidelity music systems. Economics usually dictate however that these numbers are cut in half. The resulting damping factor at the load should be based on experience and customer satisfaction. Once a minimum damping factor is determined for a particular type of installation, the following equation can be used to calculate the maximum length of two-wire cable which can be used to achieve the minimum damping factor specified at the load: ZL DF -Zo Max Length = . DCR ZL = load impedance Zo = Amplifier source impedance DF = minimum permissible damping factor DCR = dc resistance per foot of the 2-wire cable (Table III) For 70-volt systems ZL can be approximated as: ZL = 70.7-/Pout Pout = Amplifier rated power For 100-volt systems ZL = 1.002/Pout For 140-volt systems ZL = 141.42/Pout Suppose ZL equals 4 ohms, Zo = 0.032 ohms (AP2800) and the minimum damping factor at the load is to be 25. In addition, 18 GA cable is preferred. Then the maximum length of cable which can be used to achieve a damping factor of 25 at the load is: Max Length = ((4/25)-0.032)/0.01302) = 9.83 feet TABLE IN DC Resistance for 2-wire cable AWG DCR (ft) DCR (m) 0.00081 0.00264 0.00121 0.00421 - 10 0.00204 0.00669 12 0.00324 0.01063 0.00515 0.01691 0.00819 0.02685 0.01302 0.04289 0.02070 0.06764 0.03292 0.10658 Suppose you would like to calculate the maximum length of 2-wire cable using the same conditions as above except now you are using a 70V system instead of an 8 ohm system. For a 400 watt 70-volt system, ZL = 70.72/400 = 12.5 ohms. Using the above calculation for a minimum DF of 25: Max Length = ((12.5/25)-0.032)/0.01302 = 36 feet 20 A 140-volt 400 watt system using the same conditions as above would allow over 151 feet of 18 gauge cable. In each case, the total power loss in the cable is 22 12 Electro-Voice roughly the same (between 14 and 16 watts) even though the cable length was extended from 9.83 to 151 feet! This illustrates the advantage of high-voltage systems for distributed sound. SPEAKER PROTECTION Sometimes it may be desirable to use in-line fuses to protect loudspeaker systems (Figure 11). It is difficult however to determine the proper fuse value with the correct time lag and overload characteristics to match the limitations of a speaker system. Fuse values are shown for the given power and load in Table IV. The values are calculated for fast-blow fuses which carry 135% of their current rating for an hour but will blow within 1 second at 200%. Other fuse values may be calculated for different power levels from the following equation: Pout ZL Fuse Value = ZL.1.35 F2 FUSE FUSE Pout = rated power of amplifier ZL = load impedance Figure 11 Optional protection fuse connection TABLE IV Speaker Protection Fuse Chart Power ( Watts) 100 892 2.62 150 422 3.70 4.54 5.24 6.42 3.21 200 3.70 1622 1.85 2.27 2.62 3.21 3.70 4.14 300 400 500 7.41 4.54 5.24 5.85 8.28 CH 2 OUTPUI CH17 Compression drivers are much more susceptible to damage from low frequencies than large cone loud-speakers. Even though an electronic crossover may be employed, problems may arise in the cables between the crossover and the power amplifier, or from misadjustment of the crossover. Either of these situations could apply low frequency signals or hum to the driver and cause damage. To prevent a potential problem, Electro-Voice recommends using a capacitor between the amplifier and the compression driver to suppress low frequencies and possible dc. Refer to the example in Figure 12. In choosing a value, one must be careful not to interfere with the crossover frequency. As a general rule, select a capacitor whose break frequency with respect to the load is 3 dB down at approximately 1/2 of the high pass corner frequency. Mylar capacitors with at least a 100 volt ac rating are recommended. Table V shows the recommended capacitor values for use with 8 and 16-ohm drivers at common crossover frequencies. HI FREQUENCY LOW FREQUENCY Figure 12 BIAMP connection with driver protection capacitor TABLE V. Protection Capacitor Sizes for Common Cross-Over Frequencies X-over Freq 8 Ohm 16 Ohm 500 HZ 80 UF 40 uF 800 HZ 50 uF 25 UF 1000 HZ 40 uF 20 uF 1250 HZ 33 UF 16 UF 2000 HZ 20 uF 10 UF 3150 HZ 12 UF 6 UF 6300 HZ 6 UF 3 uF Electro-Voice 13 Electro-Voice Operation Manual for the Model AP2800 SERVICE INSTRUCTIONS CAUTION - NO USER SERVICEABLE PARTS INSIDE. EXTREMELY HAZARDOUS VOLTAGES AND CURRENTS MAY BE ENCOUNTERED WITHIN THE CHASSIS. THE SERVICING INFORMATION CONTAINED WITHIN THIS DOCUMENT IS ONLY FOR USE BY ELECTRO-VOICER AUTHORIZED WARRANTY REPAIR STATIONS AND QUALIFIED SERVICE PERSONNEL. TO AVOID ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. OTHERWISE, REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL. SERVICE INSTRUCTIONS CAUTION - NO USER SERVICEABLE PARTS INSIDE. EXTREMELY HAZARDOUS VOLTAGES AND CURRENTS MAY BE ENCOUNTERED WITHIN THE CHASSIS. THE SERVICING INFORMATION CONTAINED WITHIN THIS DOCUMENT IS ONLY FOR USE BY ELECTRO-VOICE AUTHORIZED WARRANTY REPAIR STATIONS AND QUALIFIED SERVICE PERSONNEL. TO AVOID ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. OTHERWISE, REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL. Notice: Modifications to Electro-Voice® products are not recommended. Such modifications shall be at the sole expense of the person(s) or company responsible, and any damage resulting therefrom shall not be covered under warranty or otherwise. Note: If you need to verify the performance of the amplifier against the rated specifications, you must be able to maintain the ac line voltage constant at 120 V ac. Therefore, we recommend a suitably rated variac (50 ampere rating at 120 V ac). DC OFFSET TRIM PROCEDURE The following adjustments are best performed after the amplifier has warmed up. First remove the top cover by the 6 access screws along the front and back (Figure 13). Refer to figure 14 for the following procedure. 1. With the amplifier in dual mode, turned on and no signal, locate trim pot R7 on the Driver PCB 2. Adjust for an output of zero volts dc, +/- 1 mV, measured at the channel-1 output speaker terminals. 3. Repeat step 2 adjusting R26, measured at the channel-2 output speaker terminals. ABS IDLE CURRENT TRIM PROCEDURE The following adjustments are made on the main power amplifier board. This board can be exposed by removing the four access screws at the four corners on the rear panel and raising the driver board assembly (Figure 13). Each channel is a grounded bridge configuration. Since a grounded bridge consists of 2 amplifier stages for each output, there are 2 independent idle adjustments for each channel. One is for the high side amplifier that drives the positive output terminal and the other is for the low side amplifier which sinks or sources the return path (ground terminal). Refer to Figure 15 for the following procedures. NOTICE: Repairs performed by other than authorized warranty stations Dealers) or qualified personnel shall void the warranty period of this unit. To avoid loss of warranty, see your nearest Electro-Voice authorized dealer, or call Electro-Voice Customer Service directly at 1-800-234-6831 or FAX 616-695-4743 or write: S HARES 1. The Channel-1 high side bias is adjusted with R102 for a de voltage measure of 5 mV, +/- 0.1 mV across the outside legs of R108. 2. The Channel-1 low side bias is adjusted with R125 for a dc voltage measure of 5 mV, +/- 0.1 mV across the outside legs of R122. 3. The Channel-2 high side bias is adjusted with R202 for a de voltage measure of 5 mV, +/- 0.1 mV across the outside legs of R208. 4. The Channel-2 low side bias is adjusted with R225 for a de voltage measure of 5 mV, +/- 0.1 mV across the outside legs of R222. Electro-Voice® Customer Service 600 Cecil Street, Buchanan, MI 49107 USA Electro-Voice 15 Electro-Voice Operation Manual for the Model AP2800 IT SIGNAL CALIBRATION Equipment Required: 5. • 1 kHz sine wave generator • True RMS AC/DC Volt Meter (four digit) 4.0.2 Resistive Load 2% tolerance (500W) TOUT SENSE AND AUDIO OUT (MONITOR) SIGNAL CALIBRATION. 1. Be sure that the amplifier power is off. 2. Set the mode switch on the back panel to the dual (center) position. 3. Set the load switches for both channels in the 8/4 22 (left) position. Connect the 4.0 22 load to the output terminals of channel one. Connect the output of the generator to the input of channel one. The generator level should be off until you are ready to calibrate. Turn the power amplifier on and increase the generator level (1 kHz sine wave) for an output measure of 44.72 Vrms. While delivering this voltage to the 4.0 S2 load, adjust R35 (R36/ch2) of the driver pcb for 4.50 Vdc, measured on pin 7 of U3 (pin 7, U9/ch2). See figure 14 for trim pot locations. Turn generator signal off. 9. Turn the power amplifier off and disconnect the 4.0 2 load. 10. Turn the power amplifier on and increase the generator level (1 kHz sine wave) for an output measure of 56.57 Vrms. 11. While delivering this voltage to the unloaded output of the amplifier, adjust R120 (R152/ch2) of the driver pcb for.775 Vrms (AC) measured on pin 1 of U2 (pint, U8/ch2). See figure 14 for trim pot locations. 12. Repeat the above steps for channel two. Trim pot and IC references for channel two are in parenthesis. 8. Un 16 Electro-Voice ACCESS SCREWS TOP COVER SCREWS ACCESS SCREWS Figure 13 Access screws UL LON BD MUJER R35 R152 AUDIO_OUT_CH2 IOUT_SENSE CH1 R26 CH 2 R120 AUDIO_OUT_CH1 R7 CH 1 R36 JOUT_SENSE CH2 Figure 14 DC bias and IT calibration trim pot locations 1 R202 CH 2 R102 CH 1 Figure 15 Idle current trim pot locations Uto 2010 lo choy lo Do olan alol lo 0044 0 4 00 Snoon 00000 DO DOODOO 92208 - 1222 A1222 52108 TOO &111 R225 CH2 R125 CH 1 Electro-Voice Electro Voice Operation Manual for the Model AP2800 INPUT CARD PIN ASSIGNMENTS The input module connects to the amplifier via a 30-pin connector (reference designator J1A of the input board schematic). The amplifier provides various signals and controls through this connector. The following is a brief description of each pin function. PIN# NAME 16 DGND 17 FAULT_CH1 uw 18 DGND 19 FAULT_CH2 20 DGND 21 POWER_CTL PIN# NAME FUNCTION 1 VOUT_SENSE_CH1 0 to 5 Volt DC signal that represents the load voltage for channel 1. 2 VOUT SENSE_CH2 Same as above but for channel 2. TOUT_SENSE CH1 Oto 5 Volt DC signal that represents the load current for channel 1. 4 TOUT SENSE CH2 Same as above but for channel 2. 5 TEMP_CH1 0 to 5 Volt DC signal that indicates the channel 1 heat sink temperature. Scale is 25 to 100°C. 6 TEMP_CH2 Same as above but for channel 2. 7 AUDIO_OUT_CH1 Channel one output scaled down for 0 dBu full scale. Can be used for monitoring or line out. 8 AUDIO_OUT_CH2 Same as above but for channel 2. 9 STANDBY_CH1 Control signal turns channel 1 power supply on by forcing pin to agnd. Normally it is connected to the channel 1 fault signal pin 17. 10 +15V 15 volt DC supply with 100 mA capacity. 11 STANDBY_CH2 Same as pin 9 but for channel 2. 12 -15V -15 volt DC supply with 100 mA capacity 13 CLIP_CH1 0 to 8 volt signal. Indicates a clip condition by going high (> 4 volts). 14 +6V 6 volt DC supply with 800 mA capacity reference only to DGND. 15 CLIP_CH2 Same as pin 13 but for channel 2. FUNCTION Reference for 6 volt DC supply (pin 14). Normally connected to STANDBY_CH1. Indicates either critical temperature, over-current, output DC or shorted output devices by going high > 5 volts). Normally this signal is low ( 1 volty. It is referenced to AGND. Same as pin 16. Same as pin 17 but for channel 2. Same as pin 16. Shorting this pin to DGND will power down the entire amplifier with the exception of the 6 volt DC supply: Analog, fault and +15 volt supply ground reference. Input to power amplifier. Unbalanced and referenced to AGND. Sensitivity is 0.775 Vrms. Same as pin 22. Same as pin 22. Same as pin 22. Same as 23 but for channel 1. Same as pin 22. Connects to the chassis ground inside of the amplifier. Same as above. 22 23 AGND AUDIO_IN_CH2 24 AGND 25 AGND 26 AGND 27 AUDIO IN CH1 28 AGND 29 CHASSISGND 30 CHASSISGND 18 Electro-Voice UNKT 2 ] 01 You a 7 You ca Oui in a + OUE CH2 FLI RI 15-1 JMPI RI R4 VW ILLLLLLLL 1% wm W AV 2 Nuoro Oui C7 wpi 11 CH17 CU PH-1 ELAN ps AM AE R9 MEBEM NDO UN CHR SI_CHI ib ANANCHI P R7 - 17-1 MOLO R5 C4 NOC AVA F? Nadat #1 + RH2-1 MP2 R2 RH1-1 W TEL VA DO0202 FL2 -15 14 Тcs - OCHI GND C10 AVV CHILE CD OG HUONE W WOH HELNO ME VE 14 is oo 14 NUT ÉROUND JUMPER DE O ONORNO MUNDO ND HOW MUCHO HIMO O NON DE FALCHI U C14 22 EFN1_C12 21 MECL J3 RH4-2 05-2 JMP3 RIO 3 TOT VA 22 OND GND 3.54 CETNI 0 ch R59 C15 R17 MOND DI RH3-2 223 C c11 NW 10X 15 177 BON CH2 27 NDO NCHI HESSEN N MELE TH7-2 RH1-2 RH2-2 LEV LI FL4 WW WA JMP4 W R11 7 R18 U 14 M! NG JA TOP C12 C13 C17 Sot ANOM W HITNO ACQUOT MOOIE R15 C16 C18 VA Electro-Voice 302 PP2 JVP8 NE55321 LINK2 HOTES UNLLES OTHERWISE SPECIFIED 1 ALL RESISTORS ALE 14W 1% MF TYPE INPUT BOARD SET I SCHEMATIC/INPUT BOARD Electro-Voice FACTORY SERVICE If there is not an authorized service representative in your area you can ship the unit in its original packing prepaid to: OR Electro-Voice Customer Service 600 Cecil Street Buchanan, MI 49107 USA Electro-Voice Customer Service 9130 Glenoaks blvd Sun Valley, CA 91352 USA For a listing of authorized service representatives write to: Electro-Voice® Customer Service 600 Cecil Street Buchanan, MI 49107 USA or call: 1-800-234-6831 or FAX 616-695-4743 To obtain warranty service, a customer must deliver the product, prepaid, to Electro-Voice® Customer Service or any of its authorized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice. TECHNICAL ASSISTANCE For applications assistance or other technical information, call: 1-800-234-6831 ACCESSORIES For information on accessories contact Electro-Voice® Customer Service at 1-800-234-6831 or FAX 616-695-4743 © 1997 by Electro-Voice, Inc. All rights reserved worldwide. 7/97 42-02-052706
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