Installation Guide

VA Series Installation Guide V1.1 9

Front panel – connections and controls

PROTECT

CLIP

SIGNAL

POWER

4 CHANNEL POWER AMPLIFIER

4120

1 2 3 4 55

VA 4120

PROTECT

CLIP

SIGNAL

POWER

2 CHANNEL POWER AMPLIFIER

2120

2 1 45 3

VA 2120

1. SIGNAL – a green LED for each channel which illuminates when the channel’s signal level is above -45 dB relative to the

maximum power output. In most installations, it can be used to conrm that the channel’s source is active.

2. CLIP – an amber LED for each channel which illuminates when the channel’s signal level is within 1 dB of nominal peak

power. If this LED ashes more than occasionally, it is likely to indicate that the limiter is active and that the signal level should

be reduced, either at the rear panel LEVEL control for the channel, or at the source itself.

3. PROTECT – a red LED for each channel which indicates a fault condition: it illuminates when the channel’s protection

circuitry is active. If this occurs, the output terminals are temporarily disconnected until the fault condition clears. The

protection circuitry will be triggered either by over-temperature within the amplier, or by the detection of DC at the

output terminals.

4. POWER – turns the mixer-amplier on and off. When it is on, the green POWER LED is illuminated.

5. Air intakes – airow through the mixer-amplier is from front-to-back. The VA2120 has a single front panel vent, the VA4120

has two. Do not allow the vents to become blocked, as over-temperature will cause the protection circuitry to shut the

amplier down.