Casella CEL CEL-206 - Manual (Page 6)

Casella USA
17 Old Nashua Rd #15
Amherst, NH 03031 USA
In this general location acoustic free field conditions normally exist and the
sound level generated is almost completely dependent on the level generated by
the performers and is only marginally affected by the number of people in the
auditorium, etc. The size of the free field area will vary somewhat due to
increasing reflections as the number of people decreases. In deciding the
location of the microphone the compromises are between moving far enough back
to ensure that each speaker is contributing evenly to the measured level
without moving into the reverberant area. Although this is the 'normal'
position for the microphone there are many special circumstances that call for
alternative locations such as close to windows to control 'leaks' to noise
sensitive locations or even outside the premises. In this latter situation
special precautions have to be taken to ensure that adverse weather conditions
do not damage the microphone.
Having decided upon the microphone location it should be mounted, usually to
the ceiling, by means of the bracket supplied and the cable run to the train
unit. The cable nay be extended by means of CEL-338l/20 cables. These are 20m
long but other lengths of up to 100m nay be specified by altering the suffix
following the oblique. It is important that these cables are used as they have
the correct electrical characteristics and a security link to prevent the
microphone from being disconnected. When running the microphone cable it should
be secured by means of conventional cable clips and, preferably, be out of
sight. Similarly the connector to the extension cable should be in an
inaccessible location.
2.3 Main Control Unit
The main control unit should be securely mounted to masonry or other suitable
surface back stage in a position where the sound level peter can be easily seen
for reference as performers move on and off stage. There are three fixing
points that are accessible when the front cover has been hinged open and in
mounting the unit care must be taken not to damage any of the electronic
components inside the unit. Having mounted the unit it should be wired into the
mains supply and this should be a 240V, 50Hz, 13A feed connected via a suitable
cable to the terminal block via the centre knock out in the base as follows:
Contact No 4 Line, 7 Neutral, 5 Earth.
Then fit a standard 13A plug top to the other end and connect to a conventional
ring main. This plug should be fused at 13A, the one used for the amplifier
power outlet on the unit should be fused at 10A and the warning indicator at
2A. The amplifier power socket should then be the only one used for supplying
the power amplifiers whilst the warning indicator socket should be connected to
a suitable lamp that will be visible to the performers to give advance
indication of pending power cut off.
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