FREE ENGLISH BSS AUDIO MSR 604II (01) PDF USER GUIDE
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FREE ENGLISH BSS AUDIO MSR 604II (01) PDF REFERENCE MANUAL
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BSS AUDIO MSR 604II (01) PDF SUMMARY:
How should this manual be used?
This manual is designed to help sound engineers, installers, and consultants fully understand the MSR-604 II and use all of its capabilities. The content is structured to be read like a book, but also has broad headings for easy access. The most immediate information is at the beginning of each section, with more detailed information as you read further.
What should I do if I have comments or questions?
If you have any comments or questions about using the MSR-604 II, write to the address in the warranty section of this PDF.
What warnings should I heed when using this device?
Keep these instructions. Heed all warnings. Follow all instructions. Do not use this apparatus near water. The apparatus should not be exposed to dripping or splashing liquid, and no objects filled with liquid should be placed on the apparatus. Clean only with a dry cloth. Do not block any of the ventilation openings and install according to the manufacturer’s instructions. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat, including amplifiers. Only use attachments and accessories specified by the manufacturer. Unplug this apparatus during lightning storms or when unused for long periods of time. Do not defeat the safety purpose of the polarized or grounding-type plug. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as the power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
When the power switch is turned off, is the device disconnected from the mains?
No, for products provided with a power switch, the power switch does not break the connection from the mains.
How should the device be disconnected from the mains?
The plug should remain readily operable. For rack-mount or installation where the plug is not accessible, an all-pole mains switch with a contact separation of at least 3 mm in each pole should be incorporated into the electrical installation of the rack or building.
What should be done when replacing a fuse?
When replacing a fuse, replace it with the same type and rating only.
What should I do when using different line cords or attachment plugs?
This equipment may require the use of a different line cord, attachment plug, or both, depending on the available power source at installation. Connect this equipment only to the power source indicated on the equipment’s rear panel. To reduce the risk of fire or electric shock, refer servicing to qualified service personnel or equivalent.
What is this equipment intended for?
This equipment is intended for rack mount use only.
What does the warning “THIS APPLIANCE MUST BE EARTHED” mean?
This appliance must be earthed and connected only to a mains socket outlet with protective earthing connection.
What do the colors of the cores in the mains lead correspond to?
The cores in the mains lead are colored as follows: GREEN and YELLOW – Earth, BLUE – Neutral, BROWN – Live.
If the colors of the cores in the mains lead do not correspond with the colored markings in the plug, how should I proceed?
Connect the green and yellow core to the terminal in the plug marked with the letter E, the earth symbol, or colored green or green and yellow. Connect the blue core to the terminal marked N or colored black. Connect the brown core to the terminal marked L or colored red.
What should I do if the attachment plug needs to be changed?
If the attachment plug needs to be changed, refer servicing to qualified service personnel who should refer to the table in this PDF. The green/yellow wire should be connected directly to the unit’s chassis.
What could happen if the ground is defeated?
If the ground is defeated, certain fault conditions in the unit or in the system to which it is connected can result in full line voltage between the chassis and earth ground. Severe injury or death can then result if the chassis and earth ground are touched simultaneously.
What do the symbols on the device mean?
The lightning flash with arrow point in an equilateral triangle means there are dangerous voltages present within the unit. The exclamation point in an equilateral triangle indicates it is necessary for the user to refer to the owner’s manual. These symbols warn that there are no user-serviceable parts inside the unit.
What should I do if liquid is spilled on the unit?
If liquid is spilled on the unit, shut it off immediately and take it to a dealer for service.
What should I do during storms to prevent damage?
Disconnect the unit during storms to prevent damage.
What does the warning “RISK OF ELECTRIC SHOCK” mean?
The warning “RISK OF ELECTRIC SHOCK – DO NOT OPEN” means that there is a risk of electric shock and you should not open the unit.
What does the warning “TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK” mean?
The warning “TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE” means to avoid exposing the unit to rain or moisture to reduce the risk of fire or electric shock.
What should I do with a molded mains plug that has been cut off from the cord?
A molded mains plug that has been cut off from the cord is unsafe and should be discarded at a suitable disposal facility. Never insert a damaged or cut mains plug into a 13 amp power socket.
What should I do if the fuse cover is missing?
Do not use the mains plug without the fuse cover in place. Replacement fuse covers can be obtained from your local retailer.
What type of replacement fuses should be used?
Replacement fuses are 13 amps and MUST be ASTA approved to BS1362.
What are the two conditions for electromagnetic compatibility?
This device may not cause harmful interference and this device must accept any interference received, including interference that may cause undesired operation. Operation of this unit within significant electromagnetic fields should be avoided and only shielded interconnecting cables should be used.
How should the MSR-602II be mounted in a rack?
The MSR-602 requires a standard 19-inch rack width and a single rack space for mounting. To ensure proper ventilation and cooling, it should be mounted with one empty rack space above and one empty rack space below the unit.
How should input and output cables be wired to maintain compliance?
For continued compliance, ensure that all input and output cables are wired with the cable screen connected to pin 1 of the XLR.
What is the purpose of pin 1 on the input XLR of BSS equipment?
The input XLR pin 1 on BSS equipment is generally connected to the chassis via a capacitor to prevent ground loops while ensuring good EMC compatibility.
What should be done after unpacking the units?
After unpacking the units, inspect for any physical damage and retain the shipping carton and all relevant packing materials, should the unit require repacking.
What should be done if damage has occurred?
In the event that damage has occurred, immediately notify your dealer, so that a written claim to cover damages can be initiated.
What is the warranty period for the MSR-604 II and MSR-602 II units?
The MSR-604 II and MSR-602 II units are warranted by BSS to the original purchaser, against defects in workmanship and materials used in manufacture, for a period of one year from the date of shipment.
What is not covered by the warranty?
Faults due to purchaser misuse, unauthorized modifications, or accidents are not covered by this warranty.
What should I do if the unit is faulty?
If the unit is faulty, it should be sent, shipping prepaid, to an authorized dealer of the manufacturer stating the faults found. The serial number must be quoted in all correspondence relating to this warranty.
What important consideration should be taken when using this equipment?
Because this equipment is connected between the microphone and mixing console or patching system, it is important for safety and system noise that a proper earthing system is implemented within the cabling system. Section 4.2 of this PDF must be read prior to installation and use.
What should I check before connecting the MSR-602 II to the AC power source?
Before connecting the MSR-602 II to the AC power source, check that the voltage selector switch located on the rear panel is correctly set. If a change is necessary, ensure that the mains fuse is also changed for one of the correct rating.
What should I check before connecting the DC power leads?
Before connecting the DC power leads, check that the system ground switch on the rear panel is also correctly set to ‘earthed’.
What does the power cord of this unit contain?
The power cord attached to this unit carries the following information label: WARNING: THIS APPLIANCE MUST BE EARTHED.
What is the color code for the wires in the mains lead?
The wires in the mains lead are color-coded as follows: Green and yellow: Earth, Blue: Neutral, Brown: Live.
How do you connect the wires if the colors of the wires in the mains lead do not correspond with the colored markings in your plug?
The green-and-yellow wire must be connected to the terminal in the plug marked with the letter ‘E’ or the earth symbol, or colored green or green-and-yellow. The blue wire must be connected to the terminal marked with the letter ‘N’ or colored black. The brown wire must be connected to the terminal marked with the letter ‘L’ or colored red.
What is the purpose of the mains voltage selector switch?
The mains voltage selector switch provides simple, external adjustment for operation on all international AC power standards.
What are the acceptable voltage tolerances for the 120V and 240V positions?
The acceptable tolerance is 90V-130V for the 120V position, and 180V-260V for the 240V position.
What happens if the unit is subjected to voltages in excess of the specified tolerances?
If you subject the unit to voltages in excess of this, you are likely to cause damage.
What happens if the mains voltage is below those specified?
If the mains voltage is below those specified, there will be reduced performance before the unit finally fails to work.
What is the function of the green/yellow wire of the mains cord?
The green/yellow wire of the mains cord must always be connected to the electrical installation’s Safety Earth or Ground. It is essential for personal safety, as well as proper operation of the unit, and is internally connected to all exposed metal surfaces.
What is the earthing assumption of any rack framework where the unit might be mounted?
Any rack framework that this unit might be mounted into is assumed to be connected to the same grounding circuit.
Does the MSR-604 II need disconnection of safety earth for avoidance of hum loops?
No, the MSR-604 II has electronically balanced audio connections and does not need disconnection of any safety earth for the avoidance of hum loops.
How is incoming mains power fused?
The incoming mains power is fused within the MSR-602 II by the fuse holder mounted on the rear panel.
What are the fuse ratings for 240V and 120V voltage settings?
The fuse rating is 20mm T2AL250V for 240V voltage setting or T3.15AL250V for 120V voltage setting.
Why is it important to adhere to the fuse specification?
It is most important for continued safety that this specification is strictly adhered to.
What should be considered if the fuse fails during normal use?
If the fuse fails during normal use, it must be treated with some caution as to the cause.
What are some likely reasons for fuse failure?
One of the most likely reasons will be because the mains voltage switch on the rear panel is incorrectly set. Another reason can be the inadvertent connection of line to line rather than line to neutral phase voltages when using a three-phase supply.
What is the function of internal transient suppressors (VDRs)?
Internal transient suppressors (VDRs) protect the unit from damage by short circuiting voltage peaks in excess of their maximum rating.
What should you do if internal transient suppressors are damaged?
If internal transient suppressors are damaged, they will consistently blow replacement fuses. They will need removal to allow further use of your unit, and should be replaced as soon as possible to ensure continued protection. Refer to the appropriate section at the rear of this PDF for the removal and replacement procedure.
How is DC connection made between the MSR-604 II units and the MSR-602 II power supply?
DC connection between the MSR-604 II units and the MSR-602 II power supply is by the integral multicore cable with 9-pin D connectors.
Where should the MSR-602 II power supply be located relative to the MSR-604 II units?
The MSR-602 II power supply must always be located above the MSR-604 II units. Having the power supply at the top gives superior hum performance, and also places the HEADROOM meter and headphone amplifier in the most convenient position where they will not be obscured by cable looms from the FEED outputs.
How should the MSR-604 IIs be connected to the power supply?
The topmost MSR-604 II’s LOOP IN cable is plugged into the power supply’s LOOP OUT connector. Each remaining MSR-604 II is connected to the unit above it in a similar fashion. Finally, the male-to-female multicore D cable packed with the MSR-602 II is used to loop the final MSR-604 II’s LOOP OUT connector back to the LOOP RETURN socket on the power supply.
Why is this ‘ring’ circuit more reliable?
This ‘ring’ circuit allows a more reliable system set up, since an individual MSR-604 II may be isolated and removed from the rack without disturbing the power to the rest of the system.
What should you do with the jack screws on the connectors?
Ensure that the jack screws on the connectors are secured and tightened.
How are the audio connections made to the MSR-604 II?
The audio connections to the MSR-604 II are via XLR-style connectors on the front and rear panels.
What should be considered when making audio connections?
Attention must be given to maintaining a consistent earthing system for safe and noise-free operation. Please refer to section 4.2 for a fuller explanation and design guides.
What is the purpose of the rear panel input?
The rear panel input is electronically balanced, non-floating, and is for direct connection to the microphone, DI box, or other source of program. The input is fully RFI suppressed and has excellent common-mode rejection performance.
What should you ensure regarding the pin 1 earth connection of the rear panel input?
Care should be taken to ensure continuity of the pin 1 earth connection.
What happens when the channel phantom switch is operated?
The 48v phantom powering appears across this input when the channel phantom switch is operated.
What is the purpose of the rear panel “MAIN OUT” output?
The rear panel “MAIN OUT” output is electronically balanced, non-floating, and should be connected to the ‘front of house’ mixing console or main control area.
What is the remote attenuator facility used for on the “MAIN OUT”?
The remote attenuator facility looks at this connector for detection of phantom power voltage.
Should the “MAIN OUT” output be connected to an unbalanced input?
No, this output should not be connected to an unbalanced input.
Why is it important to maintain the pin 1 earth connection for the “MAIN OUT” output?
For consistent remote attenuator switching and microphone screening, it is important that the pin 1 earth connection is maintained.
What is the purpose of the rear panel “MON OUT” output?
The rear panel “MON OUT” output is electronically balanced, non-floating, and should be connected to the stage monitor mixing console or ancillary console which is being operated within the same grounding system.
Should the “MON OUT” output be connected to an unbalanced input?
No, this output should not be connected to an unbalanced input.
Will the pin 1 earth connection need to be disconnected when using the “MON OUT” output?
It is probable that the pin 1 earth connection will need to be disconnected at this point to avoid earth loops.
What is the purpose of the two identical “FEED” outputs on the front panel?
These two identical outputs are actively buffered, fully transformer balanced, and floating with primary/secondary isolation of 2.5kV. They are for connection to any other facility requiring a signal and are totally isolated and independent.
How is cable screening handled with the “FEED” outputs?
There is no connection to the pin 1 earth and all cable screening should be derived from the receiving end.
What precaution should be taken with the shell of the mating female connector for the “FEED” outputs?
It is also important to ensure there is no earth connection to the shell of the mating female connector, as this would make a connection to the MSR-602 II chassis ground and cause potential ground loops.
Does it matter if pin 2 or pin 3 is ‘hot’ for the balanced audio connections?
Since all the audio connections are balanced, the convention of pin 2 or pin 3 ‘hot’ is of no consequence provided all connections are wired in a similar manner.
Where can I find details of the transformer balancing options?
Please refer to appendix B for details of the transformer balancing options.
What is the purpose of the system ground switch?
The system ground switch, located on the rear panel, is the main grounding point for all the MSR-604 II units connected to the system.
What does the “EARTHED” position of the system ground switch do?
The switch will connect the electronic/signal ground to the chassis earth when in the ‘EARTHED’ position.
What does the “LIFTED” position of the system ground switch do?
The switch will disconnect the electronic/signal ground from the chassis earth when in the ‘LIFTED’ position.
Where can I find a more detailed explanation of the grounding arrangements and implications of this switch?
For a more detailed explanation of the grounding arrangements and implications of this switch, please refer to section 4.2.
What do the LEDs on the MSR-602 II indicate?
The LEDs are used to indicate that the power is turned on and present. The LEDs are wired after the main DC Fuses, so should a fuse blow the corresponding LED will go out.
Where are the DC fuses located and how should they be replaced?
The DC fuses are on the rear panel and are clearly marked with value and function. Always replace blown fuses with the correct value.
What does the HEADROOM meter show?
The HEADROOM meter is calibrated to show signal level relative to the clip point. In practice, the red 0dB LED will illuminate when the signal is approximately 0.5dB below actual clip.
Is the HEADROOM meter indication affected by the HEADPHONE LEVEL control?
No, the meter indication is not affected by the HEADPHONE LEVEL control.
What does the HEADPHONE LEVEL control adjust?
The HEADPHONE LEVEL control adjusts the level of the headphone amplifier from off to full level.
What caution should be used when setting headphone levels?
Because the amplifier is designed to produce high monitoring levels into any impedance headphones extreme caution must be used when setting headphone levels. Always turn the level down before listening to unknown signals. High-efficiency headphones and a hot signal can produce dangerous sound pressure levels. Observe the warning symbol next to the headphone socket.
Will the headphone amplifier clip or distort if the level control is turned fully up?
No, the gain of the monitor system is such that the amplifier will not clip or distort even if the level control is turned fully up. This ensures that if any distortion or clipping is heard it is not due to the monitoring system and needs to be corrected at the signal source or by adjusting the channel gain settings.
How is phantom power selected?
The MSR-602 II power supply provides each MSR-604 II with 48v DC for phantom powering capacitor microphones. This is selected by operating the individual channel switch and it is connected across the ‘input’ connector in the standard phantom powering manner.
What is the typical current availability for phantom power?
Typical current availability is 10mA per channel for a 40-channel system.
How is phantom power indicated?
Phantom power is indicated by a front panel LED.
What happens when LINE input is selected?
When LINE input is selected, phantom power and the LED indicator are disabled.
What does the LINE/MIC switch do?
This switch introduces a 20dB pad into the input circuit of the unit, and raises the input impedance to suit line-level signals.
What is the maximum signal level in the mic position?
In the mic position, the maximum signal level is +13dBu (with the GAIN set to -10dB).
What is the maximum permitted signal level in the line position?
In the line position, phantom powering is disabled, and the maximum permitted signal level is +33dBu (with the GAIN set to -10dB).
What does the GAIN switch allow?
The GAIN switch allows the input amplifier gain to be changed in 10dB steps from -10dB to +30dB to precisely match the input signal to the internal headroom of the MSR-604 II.
What does the CLIP LED indicate?
The CLIP LED, situated below the GAIN switch, illuminates when the peak signal level approaches within 1dB of clip. It features a fast-acting full wave rectifier and a hold circuit which ensure that all transient peaks are unambiguously indicated.
How is the 10dB input pad activated?
A 10dB input pad is activated when the channel detects a +48v phantom signal is present on the MAIN OUTPUT. This allows the front of house mixing engineer to remotely reduce the input signal if he detects that the channel is being overdriven.
When is the remote attenuator activated?
A front panel LED indicates when the REMOTE ATTENUATOR is active.
What is the recommendation for setting up and calibrating the system with the remote attenuator?
It is recommended that the system is set up and calibrated without the remote attenuator activated, and that it is reserved for emergency use.
Can the remote attenuator function be disabled?
No, the remote attenuator function cannot be disabled.
What caution should the engineer observe with the desk phantom switch?
The engineer should observe the same caution with the desk phantom switch as he would if a phantom-powered microphone were directly connected to the desk input.
What may happen when using the desk phantom switch?
Use of the desk phantom switch is almost certain to produce an audible click, so it is recommended that the channel be closed briefly during switching.
What happens when the LISTEN switch is pressed?
Pressing the LISTEN switch connects the channel signal to the HEADROOM meter and headphone amplifier on the MSR-602 II power supply. It is a momentary switch which needs to be held in during monitoring.
How is the listen bus arranged?
The listen bus is arranged so that only one channel will register on the monitor section at any time. If two listen switches are pressed at the same time, the one that is closest in the chain to the PSU will register.
What safety caution should always be taken when listening to unknown signals through the headphone monitor?
Always turn the level down before listening to unknown signals. High-efficiency headphones and a hot signal can produce dangerous sound pressure levels. Observe the warning symbol next to the headphone socket.
What is the grounding of the metal case of the MSR-604 II?
The metal case of the MSR-604 II is not connected to the electronic 0V, and is taken to the mains safety ground via its DC lead connection into the MSR-602 II.
How is the MSR-602 II grounded?
The MSR-602 II has a permanent safety ground connection via the power cord.
What is discussed in section 4.2?
Section 4.2 discusses the grounding of the electronic 0V.
Where should the MSR-602 II power supply unit be mounted in a rack?
The MSR-602 II power supply unit should be mounted at the TOP of a rack, above the MSR-604 II units it powers.
What may happen if the power supply unit is mounted below a MSR-604 II unit?
If a power supply unit needs to be mounted below an MSR-604 II, the system should be checked for mains-induced hum.
What steps may be taken to reduce mains-induced hum?
Leave a gap of at least 1U between the PSU and the closest MSR-604 II. Contact your BSS agent to obtain a mumetal shield which may be affixed to the top cover plate of the MSR-602 II. Reduce the number of units in the system.
What must be ensured in all cases when installing the MSR-602 II and MSR-604 II units?
In all cases, the MSR-602 II and the MSR-604 IIs MUST be fully supported along their depth.
What may occur if the MSR-600 II cases are not fully supported?
For touring systems, failure to observe this precaution will cause eventual metal failure of the MSR-II cases which will not be covered by the guarantee.
What are the physical dimensions and mounting points for the MSR-604 II and MSR-602 II?
The physical dimensions and mounting points for the MSR-604 II and MSR-602 II are identical. They are shown in figure 6.
How are the rear panel input and output connectors typically wired in large touring systems?
In large touring systems, it is envisaged that the rear panel input and output connectors will be wired into a multiway distribution panel forming part of the same rack.
What is kept tidy by wiring the rear panel connectors into a multiway distribution panel?
In this way, all cabling for the main system is kept tidy and away from the front of the unit.
What are the isolated feeds on the front of the unit available for?
The isolated feeds appearing on the front of the unit are available for the external facilities, and their connection will not interfere with the in-house cabling system.
What should be avoided in close proximity to the microphone stage box system?
As with any microphone stage box system it is advisable to avoid the close proximity of heavy power cabling, power transformers and all forms of lighting control equipment.
Why is it important to ensure a consistent and positive earthing system?
In any multi-channel audio system where low-level signals are being routed, it is important to ensure a consistent and positive earthing system to minimize any possible noise interference and hum loops.
Why is it important to ensure reliable earthing and screening with microphones?
With the use of microphones it is especially important to ensure reliable earthing and screening not only for these noise considerations but also for the safety of the performers.
What is the star grounding point in the system shown in Figure 8?
The star grounding point is the main ‘front of house’ mixing console, and this earth is the one used to shield all cables and the microphone body.
What connection should not be made to the MSR-604 II chassis earth?
There should be no connection between the main front of house mixing console earth and that of the MSR-604 II chassis.
What should be the setting of the system ground switch on the MSR-602 II rear panel when using the front of house console as the main grounding point?
The system ground switch on the MSR-602 II rear panel should be set to ‘lifted’.
How are the metal casings of the MSR-600 II system grounded?
All the metal casings associated with the MSR-600 II system will be grounded via the MSR-602 II power cord, and through a separate conductor within the DC power lead to the MSR-604 II units.
How is the electronic 0v ground connected to the main front of house mixing console?
The electronic 0v ground will be connected to the main front of house mixing console earth system via the interconnecting audio cables.
What is the typical connection for the stage monitor console and the signal connecting cables to the ‘MON OUTPUT’ connector?
In general, the stage monitor console will be connected to the stage mains power grounding system, so the signal connecting cables to the ‘MON OUTPUT’ connector will require the earth connection to be disconnected.
Where should the cable screening be derived from when using the ‘MON OUTPUT’ connector?
The cable screening will be derived from the monitor console, but should not be connected to the electronic 0v earthing system of the MSR-604 II via pin 1 of the connector.
Where should the disconnection of earth connection be implemented?
This disconnection would be implemented either in the connector or at the monitor console multiway connector wiring point.
What are other systems of earthing that can be implemented?
Other systems of earthing can be implemented, such as using the stage earth as the main star point, in which case the system ground switch would be set to ‘grounded’, or to use the stage monitor console as the main star point.
What are the important things to remember in any system when implementing earthing?
Choose one star point for all grounding. Ensure all microphone screening is permanently held to this ground. Ensure that the two main earthing systems, namely stage and front of house, do not accidentally short together. Avoid sending signal currents along cable screens.
What is the purpose of the small pre-numbered self-adhesive labels supplied with the MSR-604 II?
In a system with more than one MSR-604 II unit, identifying which channel of which MSR is the actual system channel will become necessary, and the small pre-numbered self-adhesive labels supplied with the MSR-604 II can be used for this purpose.
How is a dual power supply implemented within the MSR-600 system?
This is implemented within the MSR-600 system such that any two MSR-602 II units can be directly connected together. Both units are switched on at all times, and power sharing ensures that the system will continue to operate should either unit fail.
What outputs can be set to drive at mic or line level?
Each MAIN output and MON output can be individually set to drive at mic or line level. A third setting which may be described as ‘Hot mic level’ is also available in order to provide a headroom structure which is compatible with previous versions of the MSR-604.
What is the factory default setting for the MAIN and MON outputs?
All outputs are set to mic level when the MSR-604 II leaves the factory. Note that the FEED outputs are set for clip at +3dBm (mic level) only and cannot be changed.
Where are the OUTPUT LEVEL SELECT header blocks located?
The OUTPUT LEVEL SELECT header blocks are clearly marked on the main PCB and are described in Table 1.
What should I not do with the header settings?
Note that combinations of header settings other than those shown should not be used as they do not give a proper balanced drive.
How can the MSR-604 II system be reconfigured to act as a distribution amplifier?
For use as a distribution amplifier, or in any situation where more than four outputs per channel are required, the MSR-604 II system may be reconfigured by moving internal jumpers. Up to sixteen adjacent channel sections, a total of sixty-four outputs, may be driven from a single input stage.
How is the internal bus between adjacent channels continued?
The internal bus is continued via the multiway LOOP connector between MSR-604 II units, allowing blocks of D.A. channels to span several output sections.
Where are the default jumper positions identified on the PCB?
The default jumper positions are identified on the PCB by a white block printed adjacent to the relevant jumper pins.
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