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The amplifier is one rack unit high (1U) and will mount in a standard EIA 19” rack. Amplifiers may be
stacked directly on top of each other. If the average power is above 1/8 of full power, spaces between
units and/ or forced air cooling may be used. If it is the intention to fill a rack with amplifiers, we
recommend racking be 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.
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Make sure that there is an adequate air supply around the amplifier, and that the rear of the amplifier has
sufficient space to allow the air to circulte. If the amplifier is rack-mounted, do not use covers or doors
on the front or rear of the rack.
Should a 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.
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
.
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WARNING!
A label just below the mains cable on the rear of the amplifier indicates the AC mains
voltage, for which the amplifier is wired. 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.
!
If the power plug is not appropriate for your country, it can be cut off and wired to a suitable connector in
the following way:
BLACK or BROWN
LIVE
WHITE or BLUE
NEUTRAL
GREEN or GREEN/YELLOW
EARTH
Once the AC connector is connected to a suitable AC supply, the amplifier can be started with the power
switch. When you power up the amplifier it takes a couple of seconds to check its circuits (this is known
as the "soft start" or "slow start" sequence), the two bottom green LED’s come on to show the output
circuits are receiving the correct rail voltage.
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There is no ground lift switch or terminal on this amplifier. The signal ground is always floating via a
resistor to chassis and the grounding system is automatic. If a potential above 0.6V presents itself between
signal ground and chassis ground, a short circuit is introduced between the two, thereby enabling electrical
protection. If a unit in the system is faulty, its mains fuse will blow, due to this automatic ground system.
If however you wish to tie the signal ground to chassis, connect the XLR-connector’s shell lug to pin 1. In
the interest of safety never disconnect the earth pin on the AC power cord.
For all units that are CE or FCC approved (radio interference), there is an AC mains filter. This filter
needs the chassis ground for reference, otherwise a current loop is formed via the signal ground.
Use the balanced input to avoid hum and interference.
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