Field Acoustics UK 500, Instruction Manual

Page: 7 / 17

3. Interface Elements, Rear Panel.
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(5) Cooling Fan Outlet
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Hot air exits here. M
ake sure all rear (and front) ventilation paths are free
from obstruction and air flows freely, otherwise the amplifier will trip into thermal
protect mode prematurely and in some extreme circumstances damage may occur.
(6) Output Connectors
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The Output sockets are Neutrik Speakons and accept a Neutrik NL4FC plug. Avoid inferior
alternatives, as they may present numerous hazards due to less than ideal construction.
Insert the plug and turn clockwise until you hear it click. This ensures correct connection has
been made. To remove, pull back the levered tab and turn anti-clockwise.
Ready-made, sensibly priced, quality interconnection leads suitable for use with the amplifier
should be easy to source. However, with sufficient skill, it is possible to make/modify leads for
the task. proceed to Chapter 5. - “Cables, Making your own”.
.
l
Only the first two pins (+1 and -1) are connected to the indicated channel.
However - for Channel A ONLY, pins +2 and -2 are tied to Channel B, to allow both output
channels to be carried on one cable and a more convenient way to wire for bridged mode.
.
l
For STEREO/MONO operation, unmodified “off the shelf” cables will usually work fine.
.
l
For BRIDGED MONO mode operation to work, custom wiring MUST be used (Chapter 5)
.#
NOTE: - Generously Heavy Duty Speaker Cable should be used to ensure
optimal performance of the amplifier and loudspeaker system. The cable
should be at least comparable to good heavy duty 13 amp mains flex.
The use of heavy cable where a low total impedance is presented to the
amplifier channel. Unduly long cable runs should be avoided where
possible.
Excessively thin cable prevents the amplifier from delivering its full
potential to the speakers, wasting the energy as heat in the cable. Under
extreme circumstances this may even cause the cable to start a fire.
.
CAUTION: - Great care should be taken to ensure cables are in good
condition and connectors are wired correctly and safely as short circuits
and intermittent connections may cause damage to equipment and in
extreme
circumstances a fire hazard may occur. Exposed
connections/bare wire present an electrocution hazard. Never use
incompletely housed Speakon connectors to make connections
Cable testers which allow you to hook up both ends of the cable and
confirm correct wiring are available and purchasing one as a standard tool
for debugging and partial safety assurance is recommended.
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