The MC300 can be used to feed a constant voltage line, often used in background music
applications. For a 25 volt line, use the 2 ohm outputs on the amplifier.
Because the crosstalk between channels on the MC300 is almost non existent, each channel
can be used as a separate monophonic amplifier. An example would be one channel feeding
background music to a given area, and the other channel used for paging in a different area.
MONOPHONIC BRIDGED OPERATION
The MC300 can be used as a single channel monophonic power amplifier in bridge
configuration. The two amplifier channel outputs add together in series when used in mono
(BRIDGED). The MODE switch connects the right channel inputs to both power amplifiers, with
the phase of the left channel inverted to get bridge operation. The speaker connections, both
common and hot, should be connected only to the left and right amplifier output impedance taps
as shown. The common amplifier output connections are not used in MONO (BRIDGED)
configuration. For example, the two 8 ohm outputs will add together to become 16 ohms.
To maintain the mono output of the amplifier in phase with the input signal in MONO
(BRIDGED) operation, connect the hot speaker terminal to the RIGHT channel impedance
tap and the common speaker terminal to the LEFT channel Impedance tap.
SPEAKER IMPEDANCE
IN OHMS
4 to 8
8 to 16
16 and up
AMPLIFIER OUTPUT CONNECTIONS
MAKE SURE THAT REAR PANEL MODE SWITCH IS SET TO MONO (BRIDGED) AND USE
ONLY A RIGHT INPUT.
MONOPHONIC PARALLEL OPERATION
The MC300 also can be used as a single channel monophonic power amplifier in parallel
configuration. The amplifier output taps are now connected in parallel and the impedances will
be exactly half what is stated at the terminals.
Connect a cable from the speaker common terminal to either the LEFT OUTPUT COM terminal
or the RIGHT OUTPUT COM terminal. (These terminals are wired together inside the amplifier.)
connect the cable from the hot speaker terminal to the impedance output desired on either
channel. Also wire across to the other channel identical impedance tap. In each case, the
chosen outputs of each channel must be wired together.
SPEAKER IMPEDANCE
IN OHMS
1 to 2
2 to 4
4 and up
AMPLIFIER OUTPUTS
LEFT COM + RIGHT COM and LEFT 2 + RIGHT 2, (1 ohm)
LEFT COM + RIGHT COM and LEFT 4 + RIGHT 4, (2 ohms)
LEFT COM + RIGHT COM and LEFT 8 + RIGHT 8, (4 ohms)
MAKE SURE THE REAR PANEL MODE SWITCH IS SET TO MONO (PARALLEL) AND USE
ONLY A RIGHT INPUT. ALWAYS BE CERTAIN TO PLACE THE MODE SWITCH IN THE
CORRECT POSITION FOR THE MODE OF OPERATION BEING USED.
12
HOW
TO
CONNECT
OUTPUTS
LEFT 2 and RIGHT 2 (4 ohm total)
LEFT 4 and RIGHT 4 (8 ohms total)
LEFT 8 and RIGHT 8 (16 ohms total)
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