MIXING AMPLIFIERS
MIXING AMPLIFIERS
15. Voltage selector.
Set the local voltage. If any doubt, contact your dealer. The unit is shipped
with the selector set to 230VAC.
16. Mains socket.
The unit can be connected to the mains circuit by a standard IEC type power cord. This socket
contains a 6,3AT, slow blow fuse. Use a screw driver to flip out the fuse compartment and to replace it by the same
type. When this fuse blows frequently, you should check the speaker load or bring the MA200 to a qualified service
centre. First check whether you didn't use a quick-blow fuse!
17. Zone 100V loudspeaker outputs.
When you need to activate/deactivate separate loudspeaker zones, you
should use these 100V outputs. These connectors should only be used for 100V operation. They are activated by the
selectors at the front (see 4). Don't use these 100V outputs together with the 8 ohm, 50V or 70V terminals.
The minimum impedance of all 100V loudspeaker lines together should be at least 50? (100Vx100V/50? = 200watt).
18. Emergency power supply.
You can power the amplifier directly from an emergency battery or power supply
supplying 24V DC/20A.
19. Loudspeaker outputs.
For low impedance use com and 8? . Keep impedance above 8? .
For 50, 70 or 100V speaker lines use COM and 50, 70 or 100V terminals.
For 100V operation, the total minimum impedance of the loudspeaker lines should be 50 ? . For 70V operation the
minimum impedance should be 24,5 ? and for 50V 12,5 ? .
Don't mix the types of speaker connections. Only one at the time should be used, unless you are able to calculate a
combination which does not overload the amplifier (example: 100? at 100V for a loud zone in combination with 25? at
50V for a quiet zone).
20. 24V DC output.
At this terminal (-/+) 24V DC will be available (max. 1A) from the moment a priority has been
activated, to control priority relays of local volume attenuators or other devices.
21. Power amp in / pre amp out.
You can send the signal of the pre-amplifier to an external device such as an
equalizer (APart PXQ2215) or limiter and feed the treated signal back into the amplifier via the power amp input.
From the “pre-amplifier out” you can also feed extra power amplifiers such as the Apart PA240P. Don't forget to feed
the signal back into the “power amp in”. When you don't use this feature, the RCA bridge should be placed.
22. Tuner output mono.
Here you can recover a fixed signal of the internal tuner to feed other devices such as your
telephone's 'music on hold' system.
23. Rec. out.
When you need a copy of the total mix, you can connect this output to any recording device such as
tape deck, MD recorder, VHS recorder, etc….You can also use this output to feed an extra amplifier. This output level
cannot be controlled separately. When you connect your MA200 pre amp out or record out to a microphone input of
another mixing amplifier, this input will have signal overload and the sound will be masked. In this case you should
use a line input, a DI-box or other signal levelling device. Never connect this output to an amplifier loudspeaker
output!
24. CD stereo input, 500mV.
Use these stereo RCA inputs to connect a line level source such as CD players, MD
players, etc…. You have to make your choice with the selector at the front (see 12). Stereo signals will be summed
together.
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Back panel
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• Read all documentation before operating your equipment.
Retain all documentation for future reference.
• Save the carton and packing material even if the equipment has arrived in good condition.
Should you ever need to ship the unit, use only the original factory packing.
• Do not spill water or other liquids into or on the unit.
• Make sure power outlets conform to the power requirements listed on the back of the unit.
• Do not use the unit if the electrical power cord is frayed or broken.
• Always operate the unit with the AC ground wire connected to the electrical system ground.
• Have gain controls on amplifiers turned down during power-up to prevent
speaker damage if there are high signal levels at the inputs.
• Do not connect the inputs / outputs of amplifiers or consoles to any other voltage source,
such as a battery, mains source, or power supply, regardless of whether
the amplifier or console is turned on or off.
• Power down & disconnect units from mains voltage before making connections.
• Do not use the unit near stoves, heat registers, radiators, or other heat producing devices.
• Do not block fan intake or exhaust ports. Do not operate equipment on a surface or in an
environment which may distort the normal flow of air around the unit. If the unit is used in an
extremely dusty or smoky environment, the unit should be periodically "blown free" of dust.
• Do not remove the cover. Removing the cover will expose you to potentially dangerous voltages.
• Do not drive the inputs with a signal level greater than that required to drive equipment
to full output.
• Do not run the output of any amplifier back into another input.
• Do not ground the red output terminal, never connect a red output terminal to
another red output terminal.
• In case of mal-function this device should be serviced by qualified service personnel only.
SAFETY INFORMATION
!!
C A U T I O N
TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER OR BACK
NO USER-SERVICEABLE PARTS INSIDE
SERVICING ONLY FOR QUALIFIED PERSONNEL
