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INSTALLATION
Racking
All amplifiers are 3U DIN high, standard 19-inch
rack mount width.
Four front-panel mounting holes are provided
for use with M5 or M6 screws. To avoid bending
the chassis in rack mounting applications where
the rack will be transported, secure the amplifiers
to the rear of the rack as well, using the rear
mounting holes on the amplifier. Alternatively, place
the bottom amplifier against the base of the rack
and pile the amplifiers with no clearance in
between.
Amplifier dimensions can be found on the "Line
Drawings" section of this manual.
Cooling
A fan cools the aluminium heat sinks from back
to front.
When mounting the unit onto a 19-inch rack, a
rack cooling system is not required, since the air is
exhausted out through the front grille.
However, the rack must not be sealed, and it
should at least have a large enough ventilation
grille to allow air into the rack.
Input cable connections
The input cabling Appendix B shows balanced
and unbalanced connection from different types of
connector to the amplifiers.
Speaker cable connections
Several output connection modes are available.
Ensure that you remove only the required
length of cable sleeve that allows for the conductor
itself to be hidden. Always note polarity shown on
the back panel.
The cables must be Class II.
Connection to mains
Nominal AC voltage is 230 V. Export versions
may operate at 115 V AC. Nominal AC voltage will
always be indicated on the back panel.
Current draw
Consumption can be consulted, for 230 Vac, at
the table in Appendix C. Multiply by two times for
115 Vac.
The
standard
IEC60065
consumption using pink noise at 1/8th of
maximum power. This is done to represent the
current requirements to reproduce a typical
musical programme. The 1/3rd power rating
represents a worst-case scenario, while the
maximum draw represents consumption with sine
wave signal, which will never occur in practice.
(Current Draw and Heat Emission tables, Appendix
C).
Heat emission
Use the table on Appendix C to predict the
heat emission from your amplifier. They are given in
both BTU (British Thermal Unit) and calories.
USE
Switch ON / OFF
Switch your sound system on from back to
front. Thus, switch on the amplifiers last on your
sound system. Switch sound sources (CDs,
turntables) first, then your mixer, then your
processors
amplifiers. If you have more than one amplifier,
switch them on sequentially, one at a time or use a
sequencer.
Follow the reverse order when switching off,
and switch off the amplifiers before any other
element on your sound system.
Clip led
The clip LED should never be on continuously.
This will distort the signal and may damage the
speakers. In fact, severe clipping is an easy way of
burning a speaker's voice coil.
The amplifiers feature an automatic limiting
system that impedes prolonged saturation, but the
dynamic nature of music signals stops it from
being a brick wall protection. Thus at most, the clip
light could be lit occasionally. Also distorted music
produces listening fatigue.
Level controls
The LEVEL rotary potentiometer is used for
changing the input gain. Although related to
output power, it is not a direct representation
of it. Thus, we can have maximum output
power with the gain at mid position. Similarly,
we may have the gain controls at maximum
and not have maximum output if our source
signal is not hot enough.
One way to use the volume controls is to
set them such that when the mixer's faders
are at their maximum level, we are just below
clipping level on the amplifier or clipping very
occasionally.
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