AMP1-DA
User Manual P/N
821530
Rev-
C
© 2006 Wohler Technologies Inc. ALL rights reserved
14
Audio Amplifier and Speaker Configuration
General Description
All
AMP1 Series
models contain high performance speakers driven by three power amplifiers; two amplifier/driver combinations
handle midrange and high frequency information in the left and right (stereo) speaker channels, while the third amplifier channel sums
the left and right channel information
below
the 500 Hz crossover point in the woofer (bass) speaker(s). Note that the woofer
channel is NOT a dedicated
LFE
or
Center
channel.
Speaker Configuration
The 1U rack size
AMP1 Series
products are configured with two speakers (left and right) to reproduce mid- and high-range audio
frequencies (in stereo), but feature
two
woofer speakers to reproduce the summed (combined)
low-range
audio frequencies from
the left and right speaker input channels. It should be noted that both woofer speakers, which are wired in series, are driven from
one
woofer speaker channel, and are NOT stereo.
See the simplified diagram below for a block diagram of the
AMP1 Series
audio amplifier/speaker configuration.
Balance Control Characteristics
The balance control attenuates the signal from the source, so that the left and right bass frequencies (summed together and reproduced in the
woofer channel) will also respond to the balance control.
Example:
If an audio signal of a voice speaking English is fed to the "A" (left) input and a voice speaking Spanish is fed to the "B"
(right) input, then the left speaker channel will reproduce the mid-range and high-range frequencies of the English
speaking voice, the right speaker channel will reproduce the mid-range and high-range frequencies of the Spanish
speaking voice, and the woofer speaker channel will reproduce the summed (combined) low-range frequencies of
both
voices.
If the balance control is
panned to the left
, then the Spanish speaking voice in the right speaker channel will diminish in
volume, the Spanish speaking voice in the woofer speaker channel will also diminish, and the English speaking voice in
both the right speaker channel and woofer speaker channel will increase slightly (to maintain overall output level). The
converse is true if the balance control is panned to the right.
See the simplified diagram above for placement of the balance control in the audio amplifier circuit.