User manual

AMP-S8 Series+ User Manual P/N 821640 Rev-B

Please refer to Figure-2a on the facing page to familiarize yourself with the front panel controls and indicators of the AMP-S8

Series+ units. The following sections describe the functions of each of the various controls and indicators found on the front panel

and are referenced, by number, to Figure-2a.

Front Panel Features

Section 2: Operation

Speakers

The AMP2-S8 (2U) models feature two mid-range speakers (left and right) and one woofer speaker, while the AMP1-S8

(1U) models feature two mid-range speakers (left and right) and two woofer speakers.

All models of the AMP-S8 Series+ contain high performance transducers 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 channel reproduces and sums the left and right channel information below the 500 Hz crossover point in the single

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

Headphone Jack

This jack accepts a standard 1/4” phone type stereo plug. Select the headphone audio sources as you would for the internal

speakers. When you plug in headphones the speakers will mute.

CHANNEL MIX (1-8) or Preset Select Buttons (1-4)

These buttons are used to select the channels to be summed into either or both speaker channels or to create and recall

presets when used in conjunction with the FN Button. See Item 7a on page 18 for a full description of the function of the

CHANNEL MIX Buttons.

Bargraph Meter Brightness Controls (Left and Right)

The brightness of the bargraph meters is adjusted using these two recessed trimpot controls. The left control adjusts the

brightness of the left four LED bargraphs and the right control adjusts the brightness of the right four bargraphs. Use a small

flat blade screwdriver or similar tool to adjust these controls. Clock-wise rotation increases the brightness.

Volume Control

This controls the loudness of the audio reproduced by the internal speaker channels or connected headphone.

CHANNEL MIX LEDs (1-8)

The AMP2-S8 (2U) model features dedicated LEDs above each bargraph, while the AMP1-S8 (1U) model uses the top

LED segment of each bargraph to indicate the channel mix selections. These LEDs are used to indicate the speaker mix of

selected channels. See Item 3 for channel mix information. See Item 7b on page 18 for a description of the function of the

CHANNEL MIX LEDs.

User Interface Controls and LCD Display

See the User Interface Features section starting on page 18 and the User Interface Function Guide starting on page 23

for instructions on the use of the User Interface Buttons and the LCD Display.

Audio Level Meters (1-8)

Source channels 1-8 are displayed via eight audio level meters (four on the left side of the front panel; four on the right side).

Meters are high-resolution LED bargraph displays with PPM dot over VU bar ballistic characteristics. In the AMP2 model these

level meters are 53-segment bargraphs with a dynamic range of -66 dB. In the AMP1 models these level meters are 26-segment

bargraphs with a dynamic range of 60 dB.

Balance Control

This control changes the volume balance between the left and right speaker channels. Please note that this control attenuates

the signal from the source, so that the left and right bass frequencies (summed together and reproduced in the woofer

channel) will respond to balance adjustments in tandem with the left and right speaker channels. See page 39 for more

information concerning the AMP-S8 Series+ balance control characteristics.