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AmPlus 100 amplifier controls
Figure 3
AmPlus 100 amplifier
controls
All About The AmPlus
TM
100 Amplifier
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
+-+-+-
70/100V
ZONE1
4-16 Ω
ZONE 2
4-16 Ω
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/Channel 2 inputs are
presented to the power amplifier section of the AmPlus 100 amplifier. There are three
possible modes.
1. In the 2-Channel/Mix position, the inputs remain separate, not summed. Channel
1 and Channel 2 level potentiometers (pots) are active in this mode. Use this
mode for:
a. Stereo (2-channel).
b. Two distinct sources in a two-zone application (2-channel), one 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
(Figure 5), 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 amplifiers as one mono signal. This mode may also be used
when driving a 70/100V load from the Channel 1 amplifier outputs and a Bose
®
Model 1B Acoustimass
®
module from the 4Ω Channel 2 amplifier 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 outputs.
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 active only 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 level
of the second listening zone without affecting zone 1. This pot may also be used to
fine-tune the bass level when using the AmPlus 100 amplifier to drive a 70/100V load
connected to the 70/100V output and a Model 1B Acoustimass module connected to
the Channel 2 output.
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