Audio Amplifier And Speaker Configuration; Balance Control Characteristics - Wohler AMP1A User Manual

1u stereo audio speaker monitors with two or optional four analog audio inputs, stereo analog outputs, and optional dual 10-segment level meters and phase indication amp1a series

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User manual (28 pages)

Table of Contents

AMP1A/-2S/-LP/-LP2S User Manual, P/N 821526, Rev-D

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 two woofer (bass) speakers.

Note that the woofer channel is NOT a dedicated LFE (subwoofer) or Center channel.

Speaker Configuration

All AMP1 (1U) products are configured with two speaker channels (left and right) to reproduce midrange and high-range audio

frequencies (in stereo) and two 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 AMP1 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 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.

The converse of the above is true if the balance control is rotated to the right. See the simplified diagram above for

placement of the balance control in the audio amplifier circuit.