D.A.S. CSA series, User Manual

Page: 23 / 32

5
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.
See Appendix D for more details.
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.
IEC60065 international standard specify AC
consumption using pink noise at 1/8 of maximum
power. This is done to represent the current
requirements
to reproduce a typical musical
programme. The 1/3 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)
th
rd
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 and crossovers and finally the
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.
INSTALLATION
Racking
All amplifiers are 2U 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.
EN
Manual del Usuario
/ CSA /
User’s Manual