What do the indicator lights on the front panel mean?
The A4TI has several indicator lights: 'On' lights when the amplifier is powered, 'Signal' lights at the presence of input audio signal, 'Limiter' lights when compression/limiter is protecting the amplifier, and three dB indicator lights that show output signal levels at approximately -20dB, -10dB, and -5dB from full power. The 'Protect' light indicates activation of protection circuits.
From the official Dbtechnologies A4TI Professional 4 Channel Power Amplifier manual, page 2
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