5
CONNECTIONS
INPUTS
The inputs are made via 2 separate 3 pin XLR connectors wired in parallel. Either socket can be used as
the input, the other one can be used to link to other amplifiers (‘daisy chain’) or to the other input for
mono signals.
They are electronically balanced and should be connected via a high grade twin core screened cable, as
follows :-
PIN1 - Screen (see note)
PIN2 - Hot ()
PIN3 - Cold (signal -)
The amplifier is designed to operate with fully balanced equipment and ground loops or loss of
performance may be experienced if connected to unbalanced sources. If it is unavoidable however, the
following wiring should be used. The cable should still be twin core plus screen.
PIN1 - Screen - connected to the chassis of the unbalanced equipment - or left disconnected at the
unbalanced end.
PIN2 - Signal Hot
PIN3 - Signal Cold
The input requires a peak level of +6dBm for full output.
NOTE
: This amplifier is wired to the latest industry recommendations. PIN1 is connected directly to
the chassis/mains earth. If ground loops (mains hum) are encountered remove the screen
connection from the other end of the cable and leave it open circuit. If problems persist,
consult your dealer/supplier, DO NOT TAMPER WITH OR ALTER ANY GROUND
(EARTH) CONNECTIONS INSIDE THE AMPLIFIER.
BRIDGED OPERATION
In Bridged mode input A is fed to both channels. Channel B will be out of phase with channel A.
OUTPUTS
The speaker outputs are via 4 mm shrouded binding posts. They can be used with 4 mm plugs or plain
wires, which can be inserted in the sides of the terminals.
Terminations are as follows :- Hot
Red
Cold
Black
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 or
MC650 should be 15 amps for 4 ohm and 20 amps for 2 ohm loads. For the MC450 it is
12 amps for 4 ohms and 15 amps for 2 ohms.
