User guide

AMP1A Series User Guide

Front Panel Controls

• Phase (LEDs): These three LEDs indicate the instantaneous and

average phase (polarity) conditions between the sources) assigned

to the left speaker channel and the source(s) assigned to the right

speaker channel. The larger LED labeled AVG indicates the average

phase condition between the left and right speaker channels. The

two smaller LEDs labeled Φ+ and Φ- indicate the instantaneous

phase relationships. Indication is as follows:

• The upper Φ+ LED glows (or blinks) green for in-phase

signals.

• The lower Φ- LED glows (or blinks) amber for out-of-phase

signals.

• The large center

AVG LED indicates the average phase

condition by glowing green for in-phase signals, or red for

out-of-phase signals.

In general, observing the average LED alone is sufficient for proper

phase monitoring. While it is normal for stereo signals to contain

some intermittent instantaneous out-of-phase and in-phase

conditions (Φ+ and Φ- LEDs), a steady red glow of the average LED

indicates an out-of-phase alarm condition.

AMP1A Plus-Specific Front Panel Controls

Figure 1–5 AMP1A Plus Front Panel

Source Select (Toggle Switch): This switch selects either the Source 1

Source 2 inputs for monitoring.

Speakers

Headphones

Volume

Balance

Power

Source Select