4
INTRODUCTION
Thank you for purchasing a MARTIN AUDIO power amplifier. This manual
contains important information on operating your amplifier correctly and
safely. Please take some time to read this manual and familiarize yourself
with the advanced features of this amplifier.
4.1
The front panel
Figure 1. Front panel
1. Carry/protection handle
Both handles can be used to carry the amplifier; they also act as protection
for the front panel and controls. In fixed installations or where rack front
covers are too shallow, they may be removed by unscrewing the retaining
bolts behind the front panel.
2. Input level attenuators
These controls are used to set the signal level entering the amplifier. They
are calibrated in dB to assist the set up of active loudspeaker systems.
(See page 16).
3. Protect indicator LED
This indicator illuminates if the amplifier attempts to function above its
maximum operating temperature (90ºC). The indicator first comes on as a
warning to either turn down the input level or check the cooling
arrangements, after which point the amplifier will mute the input signal.
When the cooling fans have returned the output heat sinks to the normal
operating temperature, the input signal is un-muted.
The Protect LED also illuminates when constant signals above 12kHz at full
power are detected at the output terminals. When this occurs the input
signal is muted until the VHF signal is no longer present. (See page 18).
4. Clip/limit indicator LED
This indicator signals 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. (See pages 16-17).
• When the clip limiter is not engaged, it has an increased time constant
and illuminates for a longer period.
Martin Audio – MA4.2 Power Amplifier
E
NGLISH
4
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