Operation; Outputs - MC2 Audio MC1250 Operating Instructions Manual

OUTPUTS

The speaker outputs are via 4mm shrouded binding posts. They can be used with 4mm plugs or plain
wires, which can be inserted in the sides of the terminals.
Terminations are as follows:-
NOTE: 1. Although the "cold" output terminals are nominally at 0V, they should not be joined
together, otherwise cross-talk may be introduced.
2. The currents involved are very high, especially when using 2 ohm. loads. The speaker
cables should be capable of carrying the currents, otherwise the losses will cause the
cables to get hot and audio power will be reduced. The minimum rating for an MC750
should be 15 amps for 4 ohm and 20 amps for 2 ohm loads.
NOTE: Do not connect the inputs/outputs to any other voltage source such as a battery, mains
source or power supply, regardless of whether the amplifier is turned on or off.
Do not run the output of any amplifier channel back into another channel's input and
do not parallel or series-connect an amplifier output with any other amplifier output.
BRIDGED (MONO) OPERATION
Connect as follows : HOT
COLD
Leave both COLD connections open circuit, they are internally joined.
NOTE: The load impedances change when operating in the bridged mode. (See Load/Power section
below.)
LOAD/POWER SWITCH 2 ohm/4 ohm
In the 4 ohm position, the amplifier supply voltages are set up for loads of 4 ohms and above. Lower
impedance loads can be connected but the internal current limit circuit could cause clipping, and unless
the signal is very dynamic, the internal temperature rise will automatically reduce the supply voltages and
set the amplifier to the 2 ohm position. In the 2 ohm position, the supply voltages are reduced and the
level (overload) indicators and limiters are re-referenced accordingly.
When operating in bridged mode, the minimum impedances are doubled, i.e. for 4 ohm loads use
the 2 ohm position and for 8 ohm loads use the 4 ohm position. The minimum load in bridged mode
is 4 ohms.

OPERATION

Read all documentation before operating your equipment and retain all documentation for future
reference.
Do not spill water or other liquids into or on the unit and do not operate the unit while standing in liquid.
Do not block fan intake or rear ventilation outlets or operate the unit in an environment which could
impede the free flow of air around the unit.
If the unit is used in an extremely dusty or smoky environment, it should be cleaned of any collected
debris at regular intervals. (See Maintenance section.)
Hot Red
Cold Black
- Channel A Hot
- Channel B Hot
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