14
BASS
LEVEL
Ch2Ch1
OFF
+10
OFF
+10
ZONE 1 ZONE 2
REMOTE
VOLUME
ZONE 1 ZONE 2
LINE OUTPUT
+-+-
INPUT
MODE
2Ch
dual
mono mono
+-+-+-
70V ZONE1
4-16
ZONE 2
4-16
XFR
CT
MODE
POWER AMPLIFIER
70/100V 2 Ch
BRIDGED
LEVEL
Zone 2Ch2Ch1
0 0 0-40 dB -40 dB -40 dB
-10-10 -10
-6 -6 -6
Ch1 Ch2
INPUTS A
+- +-
Inputs - The amplifier comes with two balanced inputs. They can be left and right channels
from a stereo source or two distinct monophonic (mono) sources for 2 - zone applications.
Two mono sources can also be mixed for single zone applications.
Input Mode - This switch determines how the Channel 1 and Channel 2 inputs are presented
to the power amplifier section of the AmPlus 100. There are 3 possible modes.
1. 2 - Channel/Mixer - the inputs remain separate, not summed. Channel 1 and
Channel 2 level potentiometers are active in this mode. Use this mode for:
a. Stereo (2 - channel).
b. Two distinct sources in a two zone application (2 - channel), 1 source per zone.
c. Two distinct sources in a single bridged mono zone (Mix).
Note: In Mix mode both sources, Channel 1 and Channel 2, are presented to the amplifier
simultaneously. When the internal source mix switch is in the MIX position, the Channel 1
attenuation controls the source connected to the Channel 1 input. The Channel 2 attenuation
controls the source connected to the Channel 2 input.
2. Dual Mono - The Channel 1 and Channel 2 inputs are summed to mono and presented to
the power amplifiers as two mono signals. This mode may also be used when driving a 70V
load from the Channel 1 amplifier outputs and a Bose
®
Model 1B Acoustimass
®
Bass Module
from the 4Ω Channel 2 outputs - see zone 2 level adjust.
3. Mono Mode - Both inputs, Channel 1 and Channel 2, are summed to mono. Only the
Channel 1 level pot is active.
Level - Channel 1 level adjust - In 2 - channel (stereo) mode, this pot affects the signal level
at the channel 1 low impedance (4Ω) outputs. In dual mono mode, it controls the zone 1 level.
In mono mode, it controls the level of all inputs.
Channel 2 level adjust - In 2-Channel (stereo) mode, this pot controls the signal level at the
channel 2 low impedance (4Ω) outputs. This pot is not active in dual mono or mono modes.
Zone 2 level adjust - This pot is only active when the input mode is dual mono. In this mode,
this pot controls the signal level at the channel 2 low impedance outputs. This pot is a slave to
the channel 1 pot; that is, the channel 1 pot controls the level of both zones in a 2-zone
system. However, the zone 2 pot can be used to fine-tune the bass level when using the
AmPlus 100 to drive a 70V load connected to the 70V output and a Model 1B Acoustimass
Bass Module connected to the channel 2 output. This pot may also be used to fine-tune the
bass level when using the AmPlus 100 to drive a 70V load connected to the 70V output and a
Model 1B Acoustimass Module connected to the channel 2 output.
AMPLUS™ 100 AMPLIFIER CONTROLS
Ω
Ω
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