8. Gain select switch
Allows amplifier gain to be switched between 32dB (2.26Vrms input
sensitivity) and 41dB gain (0.775mV input sensitivity). (See page 15).
9. AC power cable (See page 6)
5
INSTALLATION
5.1
Mounting
The amplifier is two rack units high (2U) 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.
5.2
Cooling
Your amplifier uses forced air cooling to maintain a low and even operating
temperature. All MARTIN AUDIO MA Series amplifiers have front to rear
cooling. Never try to reverse the air flow, as the amplifier needs a pressure
chamber between the fans and heat sink and this only operates in one
direction of the air flow (see Design features on page 19).
Should the heat sink get too hot, its sensing circuit will mute the hot
channel. If the power supply overheats, another sensing circuit will mute all
output channels until it cools down to a safe operating temperature.
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.
For fixed 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 8.
5.3
Operating voltage
WARNING!
A label below the mains cable on the rear of the amplifier indicates the
selected AC mains operating voltage.
Connect the power 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.
For converting a 230 volt amplifier to 115 volt or vice-versa, see Appendix A.
Martin Audio – MA4.2 Power Amplifier
E
NGLISH
6
CONTENTS
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