ModWright Instruments KWA 150, KWA 150SE Owner's Manual
KWA 150/150SE Power Amplifier
Owner’s Manual
Manufactured by ModWright Instruments, Inc.
21919 399th St., Amboy, WA 98601
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USA
www.modwright.com
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PLEASE READ FIRST:
General operation and protection circuitry of amplifier.
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Startup:
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To power unit up, simply depress the large MWI logo on the faceplate of the amp.
When you do this, the unit will turn on and logo/button and internal blue lights
will flash for approximately 45 seconds, while amp output is muted. This is
normal and is part of the startup and stabilization sequence.
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If unit does not power up at this point, check to be sure that power plug is firmly
seated and power cord is connected to mains voltage indicated on back panel of
amplifier. US/Canada 120V, HK 220V, Europe and other countries 220V-240V.
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Protection Circuitry:
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This amplifier has multiple levels of circuit protection, to prevent damage
amplifier and speakers.
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DC input protection is provided by transformer input coupling.
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Fuses:
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Thermal overload protection is provided by internal thermal sensors. Upon
thermal overload, amp will simply shut down. There will be no red lights, the
unit will power down as the overload circuit cuts all power to unit. If this
happens, let amp cool and then turn back on.
Short-circuit and over-current protection is provided by our unique and
proprietary TSPTM Total Silent Protection circuitry, which resides entirely outside
of the signal path. When protection is triggered, the channel or channels effected
simply mute, or the amp shuts down. To reset, simply power the unit off, wait ten
seconds and power back up.
DO NOT plug and unplug RCA signal connectors when the amp is on, or turn the
amp on without RCA or XLR signal connectors in place. If you do plug or
unplug the signal connectors (RCA or XLR) while the amp is on, you may engage
protection circuitry, as will be apparent by the fact that one or both channels are
muted. If so, turn off amp, let it sit for 10 seconds and power it back on again.
All fuses are internal and are only to be replaced at the factory or by factory
authorized technician. There are no user serviceable parts inside and opening the
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unit will void the factory warranty. If unit protection triggers and amp will not restart, please contact factory.
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