Martin Audio MA1.3s, User Manual

Page: 4 / 19

Martin Audio – MA1.3s Amplifier
E
NGLISH
4
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 Unpacking
Each Martin Audio MA series amplifier is built to the highest standard and thoroughly inspected before it leaves the
factory. After unpacking the unit, examine it carefully for any signs of transit damage and inform your dealer if such
damage is found. It is suggested that you retain the original packaging so that the unit can be repackaged at a
future date if necessary.
Please note that Martin Audio and its distributors cannot accept responsibility for damage to any returned product
through the use of non - approved packaging.
4.2 Front Panel
PROTECT
CLIP
- 40 dB
ON
MA1.3 s
- 40 dB
PROTECT
CLIP
ON
0
1
3 4
6 5
2
2 7 8 1
1. Carry/protection handle
Both handles can be used to carry the amplifier; they also act as protection for the front panel. 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's to assist the setup
of active loudspeaker systems. (See page
1
2
).
3. Protect indicator LED
This indicator illuminates if the amplifier attempts to function above its maximum operating temperature (90°
°
C).
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
back to the normal operating temperature the input signal is un-muted.
This indicator also illuminates when signals above 12 kHz at full power are detected at the output terminals, or if
the short circuit protection is activated. Should this occur the input signal is muted, and the process repeats until
the VHF signal is no longer present. (See page
1
3
).
4. Clip/limit indicator
This indicator signals when the amplifier output is clipping or limiting. It has two different indication states:
If the clip limiter is engaged, it has a short time constant and it illuminates briefly. (See page
1
3
).
If the clip limiter is not engaged, it has an increased time constant and it illuminates for a longer period.
5. Signal present indicator
This LED illuminates at –40dB below full output signal
6. On indicator
The two bottom green LED’s indicate that the output circuits are receiving the correct rail voltage.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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