PUBLIC ADDRESS AMPLIFIER AVSP 340/480 SERIES
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CONNECTING AUDIO SOURCES TO THE AMPLIFIER
Audio sources generally fall into one of two categories, namely BALANCED and UNBALANCED
(unbalanced sources are sometimes referred to as “single-ended”). Unbalanced sources use
the cable screen (normally Earthed) as one of the conductors and tend to be high impedance
(typically 47K Ohms or more). Balanced types tend to be low impedance (600 Ohms or less).
Electret condenser microphones require a supply Voltage to operate. This is usually provided
from an internal battery, but some can also use power supplied down the cable. This is known
as “PHANTOM POWER” and is available on all inputs (CH1-CH6) of the amplifier.
**CAUTION** When using any source which is not phantom-powered ENSURE THAT THE
PHANTOM SWITCH IS OFF FOR THAT CHANNEL.
CONNECTION TO AN UN-BALANCED SOURCE
An unbalanced (single-ended) audio source may be
connected to any of the input channels. A screened,
single core microphone cable should be used, although it
is permissible to use one core of a twisted pair as long it
has an overall screen. The trim control of the selected
channel should be set to a point where distortion is not
present on the channel.
ENSURE THAT THE CHANNEL’S “PHANTOM” SWITCH
IS IN THE OFF POSITION (OUT).
CONNECTION TO A BALANCED MICROPHONE
A balanced-line microphone may be connected to any of
the input channels. A single-pair or twin-core microphone
cable with overall screen should be used. If the
microphone is an electret condenser type which can
utilise phantom power, set the PHANTOM switch to ON
(In) otherwise set it to OFF.
ENSURE THAT THE CHANNEL’S “PHANTOM” SWITCH
IS IN THE OFF POSITION (OUT) WHEN USING
DYNAMIC TYPE BALANCED MICROPHONES.
CONNECTION TO AN UN-BALANCED MICROPHONE
An unbalanced (single-ended) microphone may be
connected to any of the input channels. A screened,
single core microphone cable should be used, although it
is permissible to use one core of a twisted pair as long it
has an overall screen. The trim control of the selected
channel should be set to a point where distortion is not
present on the channel.
ENSURE THAT THE CHANNEL’S “PHANTOM” SWITCH
IS IN THE OFF POSITION (OUT).
CONNECTION TO ADPRO REMOTE TRANSMITTERS
The Adpro models, FastScan, FastVu and FastTrace all
have unbalanced audio outputs. This drawing shows the
connections for these. A screened, single core
microphone cable should be used, although it is
permissible to use one core of a twisted pair as long it
has an overall screen. The trim control of the selected
channel should be set to minimum.
ENSURE THAT THE CHANNEL’S “PHANTOM” SWITCH
IS IN THE OFF POSITION (OUT).
Document No. AVSP340-AVSP480-OEM03 REVISION 2.1 : 28th October 2008 Page 9 of 13
