Wohler AMP2A-10S User Manual download pdf (Page 10)

AMP2A-4S and AMP2A-10S User Manual P/N 821554 Rev-B

Please refer to Figure-2a on the following page to familiarize yourself with the front panel features of the AMP2A-4S and AMP2A-

10S units. The following sections describe these features and are referenced, by number, to Figure-2a.

Front Panel Features

Section 2: Operation

Speakers

The AMP2A series internal speaker system is comprised of two mid-range tweeter speakers (left and right) and one woofer

speaker (center). The two side channel speakers reproduce, in stereo, only the mid and high frequencies.

Power Indication LED

This LED glows green to indicate the AMP2A series unit is connected to mains power and an operation voltage is present.

Audio Level Meter LED Bargraph Displays (1-2)

Audio levels for the selected 2-channel source are visually displayed via these two 20-segment, tri-color LED bargraph

meters. Dynamic range for these meters is 44 dB and they are able to display signal levels using either PPM or VU standards.

Input Level Gain Calibration and VU/PPM Display Mode for each of the two meter bargraphs is user selectable via two

DIP switch modules accessible through the top cover of the unit (see page 17 for DIP switch settings).

Contact the factory for additional information concerning meter scales and ballistics.

Volume Control Pot

This controls the loudness of the audio reproduced by the internal speakers or connected headphone. Clock-wise rotation of

this control increases the loudness of the monitored audio.

Headphone Jack

Select the headphone audio sources as you would for the internal speakers. When you plug in headphones, the speakers will

mute. This jack accepts a standard 1/4” phone type stereo plug.

Phase Indication LEDs

These three LEDs offer instant verification of phase (polarity) conditions in the pair of channels selected for monitoring in

the Left/Right channel speakers. There are three LEDs; the two smaller LEDs labeled "FAST-IN" and "FAST-OUT" show

instantaneous phase relationships in the signal, while the larger LED, labeled "AV G ", will indicate the average phase condition.

The small "FAST-IN" LED glows (or blinks) GREEN when signals are in-phase. The small "FAST-OUT" LED glows (or

blinks) AMBER for out-of-phase signals. The larger "AV G " LED indicates the average phase condition by glowing GREEN

for in-phase conditions, or RED for out-of-phase conditions. In general, it is sufficient to regard the "AV G " LED (average

phase condition) as adequate for proper phase monitoring. While it is normal for stereo signals to contain some intermittant

instantaneous out-of-phase and in-phase conditions (small LEDs), a steady red glow of the larger LED almost always indicates

an out-of-phase alarm condition.

Balance Control Pot

This control pans the volume balance between the left and right speakers.

Source Select Switch

On the AMP2A-4S model, this 4-position rotary switch selects one of four stereo pair inputs for monitoring through the

speakers (or headphones) and level meters. The numbers on this switch correspond to the numbers silkscreened above the

Analog Input Connectors on the rear panel (Item C, page 12).

On the AMP2A-10S model, this 10-position rotary switch selects one of ten stereo pair inputs for monitoring through the

speakers (or headphones) and level meters. The numbers on this switch correspond to the numbers silkscreened above the

Analog Input Connectors on the rear panel (Item C, page 12).

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Wohler AMP2A-10S User Manual Page 10