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User Guide
Cable size
0.5mm
2
(WH152)
2
0.75mm
2
1.0mm
2
1.31mm
(WH153)
1.5mm
2
(WH130)
2.5mm
2
(WH130A,WH154)
The WH430 (3m) and WH431 (5m) Speakon–Speakon leads
may be used with any load impedance. The WH432 (10m) lead
should only be used with a load 8W or higher, to avoid loss of
power in the cable.
Ventilation
ALWAYS ensure that an adequate flow of cool air is available
at the air intakes at the sides, and that the hot air can escape. If
the amplifier overheats the speakers will be disconnected, and
both green and red LEDs will go out. If the amplifier is adequately
ventilated, this will not happen during normal use.
If the amplifier is installed in a cupboard, make sure that there
is an adequate supply of cool air at the back of the amplifier.
The air vents should be cleaned periodically to remove dust
and smoke fluid residues.
NEVER install the amplifier in a sealed cabinet.
Short circuit protection.
The MA200 is protected against short-circuits on the
outputs. If this happens, it will limit its output current to a safe
level until the short circuit is removed. A short circuit should be
removed as soon as it is discovered, as the amplifier is not
intended to be run indefinitely into a short circuit. Short circuit
protection does not protect the amplifier from having too many
speakers connected to the output.
If speaker leads are too long or too thin, their resistance may
prevent the short circuit protection operating in the case of a
short circuit at the loudspeaker end of the lead - in this case the
© N.J.D. Electronics 1997
Maximum length for:
4 W load
8 W load
2.3m
4.6m
3.5m
7.0m
4.7m
9.4m
6.0m
12.0m
6.75m
13.5m
11.4m
22.8m
MA200
16 W load
9.2m
14.0m
18.8m
24.0m
27.0m
45.6m
-Page 5-
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