Rear Panel Information
MODE SWITCH
The MC 2155 will operate in three modes, Stereo,
Mono Bridge, and Mono Parallel. The Mono modes
differ in the loads they will drive and the connection
sequence to the speaker terminals.
LEFT and RIGHT OUTPUT TERMINALS
For stereo operation, output impedances of 1, 2, 4
and 8 ohms have been provided on a secure, screw
type barrier strip. For monophonic operation proper
interconnection provides 0.5, 1, 2, 4, 8, and 16 ohms
from the same barrier strips. See page 5 for connect-
ing instructions.
INPUT JACKS
In the stereo mode of operation, both input jacks
accept signal. In the mono mode of operation only
the Right (MONO) channel input jack accepts signal
and the Left channel input jack is disconnected.
INPUT LEVEL
The Input sensitivity of the MC 2155 is 0.75 volts or
2.5 V depending on the position of the INPUT LEVEL
switch. All Mclntosh preamplifiers have been de-
signed to deliver 2.5 volts output with rated input.
For the best signal to noise ratio when using Mclntosh
source equipment, place the INPUT LEVEL switch in
the 2.5 V position and the front panel LEFT and
RIGHT/MONO GAIN controls in the fully clockwise
position. If more gain is desired the 0.75 V position
may be used. For source equipment other than
Mclntosh, set the switch in the position nearest to
the stated output rating of the source equipment.
AC POWER
The input to the MC 2155 is 120 volts 50/60 Hz at
up to 6 amps. The primary circuit is protected by an 8
Amp Fuse.
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