Front Panel; Introduction; Unpacking - Martin Audio MA4.2s User Manual

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CONTENTS
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 and 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

1
1 . Ca rry /p ro tec tion ha nd le
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 . In pu t lev e l atte n ua to rs
T he se co ntro ls are u se d to se t the sign al le ve l e nterin g the am plifier. T he y are calibrated in d B 's to a ssist the se tu p o f
a ctive lou dsp ea ke r syste m s. (Se e p ag e
3 . Prote ct in dica to r L ED
This indicator illuminates if the amplifier attempts to function above its maximum operating temperature (90°
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.
T his in d icato r also illu m in ates wh en sign als a bo ve 12 kH z at fu ll p o we r a re d ete cted at the ou tp u t te rm ina ls, o r if th e
sho rt circuit p ro te ction is a ctiva te d . Sh ou ld th is occu r the in pu t sig na l is mu ted , a nd the proce ss rep e ats u ntil th e VH F
sig na l is no lo ng er prese nt. (Se e p ag e
4 . Clip /limit ind ic a to r
T his in d icato r sign a ls w h en the am plifier o u tp ut is clip ping or lim iting . It ha s two differe nt in dica tio n sta te s:
If th e clip lim iter is e n ga ge d, it h a s a sh o rt time con sta nt an d it illu m in ates brie fly. (S e e pa g e 15).
If th e clip lim iter is n o t en ga g ed , it ha s a n in cre ased time co nsta n t an d it illum in a te s fo r a lo ng er p e riod .
5 . Sign a l pre se nt in dica tor
T his LE D illu mina te s a t – 4 0d B b elow fu ll o u tp ut sign al
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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Martin Audio – MA4.2s Amplifier
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PR OTE CT
CLIP
-40dB
ON
MA4. 2s
PR OTE CT
CLIP
-40dB
ON
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AC
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GUIDES