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Power requirements and turning the amplifier on and off

Connect the CV Digital amplifier to AC mains using the supplied IEC cable. The amplifier will operate on supply voltages from

85 to 265 V, 50 or 60 Hz.

The power button

is a "soft" type; press once to turn the amplifier on. All front panel LEDs will illuminate for a few seconds

while internal diagnostics are conducted. The green LED adjacent to the power button will remain on after this sequence.

The amplifier is highly energy efficient and has an Automatic Power Down (APD) feature, which puts individual channels

into Standby Mode after 30 minutes if no input signal to the channel has been detected. If no input signals are present when

the amplifier is turned on, all channels will go immediately into Standby Mode. The power consumption in Standby Mode is

approximately 2.5 W.

Press the power button again to turn the amplifier off.

If the mains supply is interrupted while the amplifier is on, the amplifier will execute the boot/diagnostic sequence automatically

when power is restored.

Remote Power Down

The amplifier may be "forced" into Standby Mode applying a short-circuit to the rear panel REMOTE PWR DOWN connector.

The connector is a 2-pin, 5 mm-pitch screw-terminal type. The amplifier will "wake up" when the short-circuit is removed:

wake-up time is typically 200 ms. This function can be useful in shutting down e.g., visitor attractions at museums and theme

parks.

Front panel LEDs

Each amplifier channel has four LEDs on the front panel, which function as follows:

•

POWERED (green) – illuminates when the channel is active, i.e., it has been "woken up" when the input signal level

exceeds -77 dBu (typical threshold: may vary with programme type).

•

SIGNAL (green) – illuminates when the output signal level from the amplifier channel is at least 30 dB below the rated

output level.

•

PEAK (yellow) – with the channel's limiter enabled (the factory default setting), the LED illuminates when the limiter is

active, i.e., reducing gain. Note that the limiter settings are accessed via the browser control pages. When the limiter is

disabled, the LED illuminates to indicate that the amplifier is clipping: this will normally indicate that the signal level is

too high.

•

PROTECT (red) – illuminates when the power amplifier stage is shut down by the internal protection circuitry. This

will occur if excessive current or DC is detected at the output terminals, or if the internal temperature becomes too

high. Over-current or DC fault conditions can be cleared by removing the AC power supply for a few seconds, but when

the cause is over-temperature, the amplifier will remain in its protected state until the temperature drops (which will

generally occur if the input signal is reduced).

CV Series Digital Amplifiers v1.0