© 2004 Wohler Technologies Inc. ALL rights reserved
16
AMP2-SDA/AVU
and
AMP2-SDA/APP
User Manual P/N
821576
Rev-
A
Section 2:
Operation
Audio Amplifier and Speaker Configuration
General Description
All models in the
AMP Series
contain high performance transducers (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
(subwoofer) or
Center
channel.
Speaker Configuration
All
AMP2
(2U) products are configured with two speaker channels (left and right) to reproduce midrange and high-range audio
frequencies (in stereo) and one woofer speaker channel to reproduce the summed (combined)
low-range
audio frequencies from
the left and right speaker input channels.
See below for a simplified diagram of the
AMP2
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
left
(A) input and a voice speaking Spanish is fed to the
right
(B) input, then the
left
speaker channel will reproduce the midrange and high-range frequencies of the English speaking
voice, the
right
speaker channel will reproduce the midrange 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 rotated to the
left
(English), then the Spanish speaking voice in the
right
speaker channel will
diminish in volume and the Spanish speaking voice in the
woofer
speaker channel will also diminish.
Note that if the balance control is rotated completely to the left, the volume in both the left speaker channel and woofer
speaker channel will increase slightly to maintain overall output level. See the simplified diagram below for placement of
the balance control in the audio amplifier circuit.
The converse of the above is true if the balance control is rotated to the right.
