Martin Audio – MA900 Amplifier
E
NGLISH
5
!
7 . F an g rille filters
A g rille w ith foa m filte rs is lo ca te d o n th e fro n t pa ne l to p re ve nt du st from e n te rin g th e a mp lifie r. T h e grille is re mo vab le
for e asy cle a ning o f the filter by simp ly p u llin g the m o ff. T he foa m filter sho u ld a lwa ys b e u se d .
8 . Ca rry/p ro tection 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.
4.3
Rear Panel
230-24 0V 50- 60Hz
Current consump tion: 5. 5A
STEREO
On
f
Of
1
3
4
5
6
7
8
5
4
1
9
3
678
123
+ -
Gnd
CH.B INPUT
Made in the EEC by
MARTIN AUDIO
MA 900
OUTPUT CH.B
CH. B INPUT
XLR
Pin 1 Scrn Sleeve
2 Pos Tip
3 Neg Ring
1 / 4"
Ser. No:
OUTPUT CH.A
Must be grounded
Clip Limi ter A
1 + CH.B +
1 - CH.B -
Clip Limi ter B
On
Of
f
GAIN
41dB
38dB
35dB
32dB
29dB
26dB
23dB
20dB
+ -
Gnd
CH. A INPUT
CH.A INPUT
GAIN
CH.B
GAIN
CH.A
LINK/BRIDGE A+B
ON
OFF
STEREO
1+ CH.A+
1- CH.A-
2+ CH.B+
2- CH.B-
BRIDGE
Pin 1+ Spk+
2 - Spk-
1. Output / Speaker connector
T he N eu trik S pe akon co nn e ctor is u se d o n th e o utp uts of th e a mp lifie r. A fu ll d e scrip tion is fou n d in th e op e ra tion
section . (Se e p ag e
1 1
).
3. Clip limiter switch
Turns the clip limiter “ON” (switch IN position) or “OFF” (switch OUT position). (See page
13
).
4. Input signal XLR.
The Neutrik Combo jack is used which also features a _” TRS phone jacks. (Pin 2 is “hot”, see page
10
).
5. Link / Input. A 'Phoenix' screw terminal connector, connected in parallel to the female XLR input is provided for
hard wiring the input, or linking to another input.
6. Gain switch channel B. Three of the switches in the DIP-switch (1,2,3) select the gain of the channel to be either
20, 23, 26, 29, 32, 36, 39 or 41 dB. (See page
5
).
7. Link and Polarity reverse switch. The two middle switches in the DIP-switch are used for Link and / or Bridge
operation. (See page
6
).
8. Gain switch channel A. Three of the switches in the DIP-switch (6,7,8) select the gain of the channel to be either
20, 23, 26, 29, 32, 36, 39 or 41 dB. (See page
5
).
9. AC Mains cable. 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.
5
REAR PANEL FEATURES
5.1
Gain switch
T he g ain switch loca te d o n th e rea r p an el (the ce ntra l D IP -sw itch ) cha ng e s th e inp ut se nsitivity of the am plifier. T his
can b e u se fu l w he n u sing lo w or high no mina l inp u t sign a ls. Mo st p rofessio na l m ixin g con so les o p erate a t a level o f
+ 4 to + 6 d Bu ; th e re fo re th e 3 2d B-g ain po sitio n e nsure s th e re is p le nty o f fa d er m o ve me nt availab le . F or a se mi
p ro fe ssion al mixing de sk op erating a t a n om ina l level o f 0 dB u o r -1 0 dB th e high e r ga in se tting s o f th e a mp lifie r ca n b e
u se d.
All material © 2007. Martin Audio Ltd. Subject to change without notice.
