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What is the main function of the DOD AC 260 and the associated direct boxes?
The AC 260, 265, 275, and 285 all solve distortion problems normally associated with using high impedance sources with low impedance inputs. The product line begins with the AC 260 which is a basic easy to use direct box and progresses into the AC 285 with a cabinet emulator.
What are the features of the DOD AC 260 Direct Box?
The features of the AC 260 include:
• Allows a hi impedance unbalanced source to directly feed a low impedance balanced input.
• Low distortion
• Low noise
• Rugged metal chassis
How do I operate the DOD AC 260 Direct Box?
• Connect the output of the high impedance source to the input of the AC260.
• Connect the low impedance output of the AC260 to a mixing console or other low impedance input.
• Connect the unbalanced 1/4” tip-sleeve output to a high impedance input.
What are the technical specifications of the DOD AC 260?
| Low Impedance In/Output | 600 ohms center tapped (balanced). |
| Low Impedance Connector | XLR type jack. |
| High Impedance In/Outputs | 50KΩ. |
| High Impedance Connectors | 2- 1/4” mono phone jacks |
What are the features of the AC 265 Direct Box?
• Connects high impedance (50K ohms) to low impedance (600 ohms), or low impedance to high impedance.
• Ground lift switch to fix ground-loop hum problems.
• Allows a hi impedance unbalanced source to directly feed a low impedance balanced input.
• Low distortion
• Low noise
• Adjustable attenuation pad, makes this different from the AC 260.
How do I operate the AC 265 Direct Box?
• Connect the output of the high impedance source to the input of the AC 265.
• Connect the low impedance output of the AC 265 to a mixing console or other low impedance input.
• Connect the unbalanced 1/4” tip-sleeve output to a high impedance input (if desired).
• Set the ground lift switch to the position with the least amount of hum or noise.
What are the specifications of the AC 265 Direct Box?
| Low Impedance In/Output | 600 ohms center tapped (balanced). |
| Low Impedance Connector | XLR type jack |
| High Impedance In/Outputs | 50K ohms (unbalanced) |
| High Impedance Connectors | 2 -1/4 inch mono phone jacks. |
| Attenuation Range Switch | 0, 12, 40 dB attenuation |
| Frequency Response | 60 to 15 kHz, ±3 dB |
What are the features of the AC 275 Active Direct Box?
• Allows a hi impedance unbalanced source to directly feed a low impedance balanced input.
• Connects guitar pickups, microphones or electric instruments to a recording or P.A. console without audio quality loss.
• Input signal isolation using FET input operational amplifiers that reduce loading effects normally found on passive direct boxes.
• Flat frequency response.
• Operates with battery or phantom power.
• Ground isolation switch.
• Internal pad for speaker level input.
How do I operate the AC 275 Active Direct Box?
• Connect the output of the high impedance source to the input of the AC275.
• Connect the low impedance output of the AC275 to a mixing console or other low impedance input.
• Connect the unbalanced 1/4” tip-sleeve output to a high impedance input (if desired). This output is hard-wired to the input.
• Set the ground lift switch to the position with the least amount of hum or noise.
• Set pad switch to INSTRUMENT for line level input sources or to SPEAKER for speaker level input sources.
• Set power selector switch to ON for battery power or to OFF for phantom power.
NOTE: To preserve battery life, set power selector switch to OFF when AC275 is not in use.
What are the specifications of the AC 275 Active Direct Box?
| Frequency Response | 20Hz-20kHz, ±0.5dB |
| Gain (Inst) | -12dBu |
| Gain (Spkr) | -40dBu |
| Input Impedance (Instrument) | 1.3MΩ |
| Input Impedance (Speaker) | 10kΩ |
| Output Impedance | 200Ω |
| Power Requirements | 9V battery or 15-48V phantom power |
| Distortion (1kHz, Inst @-10dBV input) | <0.02% |
| Signal-to-Noise Ratio (Inst @-10dBV input) | Better than 86dB |
| Maximum Input (Instrument Position, 9V battery) | +7dBu |
| Maximum Input (Instrument Position, 15V phantom) | +5dBu |
| Maximum Input (Instrument Position, 48V phantom) | +20dBu |
| Supply Current (9V battery) | 4mA |
| Supply Current (15V phantom) | 4mA |
| Supply Current (48V phantom) | 8mA |
| Input Connector | 1/4” tip-sleeve |
| Output Connector | XLR, 1/4” tip-sleeve |
| Dimensions | 2.5”x4.5”x1.5” |
| Weight | 15oz (422g) |
Note: 0dBV=1.0 Vrms; 0dBu=0.775 Vrms
What are the features of the AC 285?
• Allows a hi impedance unbalanced source to directly feed a low impedance balanced input.
• Connects guitar pickups, microphones, or electric instruments to a recording or P.A. console without audio quality loss.
• Input signal isolation using FET input operational amplifiers that reduce loading effects.
• Flat frequency response.
• Operates with battery or phantom power.
• Ground isolation switch.
• Internal pad for speaker level input.
• 4×12 emulator cabinet that gives a more enhanced low end.
• Twin open-back combo that provides a brighter sound with less low end.
How do I operate the AC 285?
• Connect the output of the high impedance source to the input of the AC 285.
• Connect the low impedance output of the AC 285 to a mixing console or other low impedance input.
• Connect the unbalanced 1/4” tip-sleeve output to a high impedance input (if desired).
• Set the ground lift switch to the position with the least amount of hum or noise.
• Set pad switch to INSTRUMENT for line level input sources or to SPEAKER for speaker level input sources.
• Set power selector switch to ON for battery power or to OFF for phantom power.
• Set speaker settings to FLAT if you want the direct-to-microphone sound. If you are seeking the guitar-to-board sound, the 4×12 or COMBO settings are great.
What are the specifications of the AC 285?
| Frequency Response | 20-18 kHz ±1dB, 10-30 kHz ±3dB |
| Gain (Instr) | -12dB |
| Gain (Spkr) | -40dB |
| Input Impedance (Inst) | > 1 megΩ |
| Input Impedance (Spkr) | >200 kΩ |
| Output Impedance | 200Ω |
| Power Requirements | 9V Battery, 15-48V Phantom, 9V AC Adapter (DOD PS3) |
| THD (1kHz, Inst @ 0dBu, 9V batt) | <0.08% |
| Signal to Noise Ratio (Inst @ -10dBu, 9V) Flat | >86dB |
| Signal to Noise Ratio (Inst @ -10dBu, 9V) Spkr Emulation | >80dB |
| Maximum Input Level (Inst) 9V battery or adapter | 7dBu |
| Maximum Input Level (Inst) 15V Phantom | 5dBu |
| Maximum Input Level (Inst) 48V Phantom | 20dBu |
| Supply Current (9V battery) | 8 mA |
| Supply Current (48V Phantom) | 16 mA |
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