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AMP2A-VTR and AMP2A-VTR2 User Manual P/N 821580 REV-B
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.
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 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 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 AMP2 (2U) Audio Amplifier and Speaker Block Diagram above for placement of the balance control in the
audio amplifier circuit.
14
Audio Amplifier and Speaker Configuration
Balance Control Characteristics
© 2004 Wohler Technologies Inc. ALL rights reserved
Section 2: Operation
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