Installation; Mounting; Cooling; Operating Voltage - Martin Audio MA1400 Manual

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CONTENTS
6

INSTALLATION

6.1

Mounting

The amplifier is two rack unit's high (2U) and weighs 18Kg (39.6Ibs) and will mount in a standard EIA 19" rack.
Amplifiers may be stacked directly on top of each other. There is no need for spacing between units. If it is the
intention to fill a rack with amplifiers, we recommend racking is started from the bottom of the rack. It is also
recommended that rear supports are used for amplifiers mounted in the middle of the rack, especially if used as
part of a portable system.
6.2

Cooling

Your amplifier uses a forced air cooling system to maintain a low and even operating temperature. All fan cooled
MARTIN AUDIO MA Series amplifiers have front to rear cooling. Never try to reverse the airflow, as the amplifier
needs a pressure chamber between the fans and heat sink, and this only operates in one direction of the airflow.
Make sure that there is an adequate air supply in front of the amplifier, and that the rear of the amplifier has
sufficient space to allow the exhaust to escape. If the amplifier is rack-mounted, do not use covers or doors on the
front or rear of the rack. If the heatsink temperature rises too high, its sensing circuit will mute the hot channel.If the
power supply overheats, another sensing circuit will mute both output channels, until they cool down to a safe
operating temperature
For installations with a central cooling system, usually found in fixed installations with a dedicated rack room, it may
be necessary to calculate the maximum heat emission. Refer to Power consumption on page 9. Remember! never
rack different makes of amplifier together that have opposing air flow characteristics.
6.3

Operating voltage

WARNING!
A label just below the mains cable on the rear of the amplifier indicates the selected AC mains operating voltage.
Connect the mains cable only to the AC source referred to on the label. The warranty will not cover damage
caused by connecting to the wrong type of AC mains.
If th e p ow er plug is n ot ap prop ria te fo r yo u r co u ntry, it ca n b e cu t o ff an d re - w ire d to a su ita ble co n ne cto r in th e
follo win g wa y:
B LA CK o r B RO W N
W HITE o r B LU E
G RE EN o r G RE E N/YE LL O W
O nce co n ne cte d to a su ita ble AC su pp ly, the am plifier ca n be starte d w ith the p o we r switch. Wh en yo u po w er u p the
a mp lifie r it ta ke s a cou p le o f secon d s to se lf ch eck (th is is kno wn as th e "soft sta rt" o r "slow start" se qu e nce), the fa ns
the n blo w at high sp ee d b efore g oing in to "idle". T he tw o bo tto m gre en L E D's th e n illum in ate to sho w th e a mp lifie r is
o pe ra tio na l.
6.4

Grounding

T he re is n o g ro un d lift switch o n th is am plifier. T he sign al grou nd is a lwa ys floa tin g (lifted ), with re sp ect to ch a ssis
g ro un d via a grou nd lift re sisto r. If a p ote ntia l d iffe ren ce ab ove 0 .6 V is de te cte d b etwe en sign a l grou n d an d cha ssis
e arth , a sho rt circu it is a utom a tica lly introd uce d be tw e en th e tw o, en su rin g ele ctrical p ro tectio n. If o th er eq uipm e nt o r
a mp lifie rs w ith in a syste m sh ou ld de velop a n e le ctrical fa ult to ea rth , the m ain s fu se on th at e q uipm en t sho u ld rup ture
d ue to this a utom atic syste m allow in g a n ea rth fa ult cu rre nt to flo w for protectio n p urpo se s.
If ho we ver yo u wish to p e rm an en tly co nn ect the sign al g rou nd to cha ssis e arth , con ne ct th e X LR -co nn ecto r's sh ell lu g
to pin 1 . In th e in terest o f sa fety n ever d iscon n ect th e e arth pin o n th e m ains ca ble .
T o co mp ly with CE a p prova l (rad io in terfe re n ce ), th ere is an AC m ain s filte r. T h is filter n e ed s the cha ssis e arth fo r
referen ce, o th erw ise a curre n t lo o p is fo rm ed via th e sig n al g ro u nd .
N ever d iscon n ect (lift) the m ain s sa fety ea rth .
All material © 2007. Martin Audio Ltd. Subject to change without notice.
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Martin Audio – MA1400 Amplifier
8
GUIDES