Martin Audio MA1.6s Specifications download pdf (Page 15)

7.5 Indicators

Figure 12. Front panel indicators

The two bottom green "ON" LED's indicate when the power supply and

output stage is operating correctly.

The "-40 dB" LED's illuminate when the output signal is greater than -40dB.

0dB is referenced to full output power. These LED's also act as signal

present indicators.

The ''Clip/limit'' LED indicates when the amplifier output is clipping or

limiting. It has two different indication states:

* When the clip limiter is engaged it has a short time constant and

illuminates briefly.

* When the clip limiter is not engaged it has an increased time constant and

illuminates for a longer period.

The remaining yellow "Protect" LED's indicate if the temperature or VHF

protection circuits are activated. These are described on page 16.

8 PROTECTION FEATURES

Each MARTIN AUDIO MA Series amplifier has many advanced protection

features that will protect both the amplifier and the speakers connected to

it, should a fault condition arise. Under normal use these features are

inaudible. All protection circuits are independent.

Output limiter

An output limiter is included to avoid amplifier clipping. When an amplifier

is severely overdriven, its output waveform is clipped (its peaks are

squared off) - reducing the crest factor. In extreme cases, the waveform

can approach that of a square wave. An amplifier is normally capable of

producing far more power under these conditions than its normal

undistorted rated power output. The limiter works by monitoring the output

and comparing the distortion produced between the input and output of the

amplifier. If the distortion exceeds 1%THD for any reason (voltage or

current clipping), the limiter reduces the input signal proportionally.

Martin Audio – MA1.6 Power Amplifier

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Martin Audio MA1.6s Specifications Page 15