ModWright Instruments KWA 150 Owner's Manual - page 7
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High/Low Bias Operation:
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High/low bias toggle is located on the rear of the amp, above the MONO binding
posts. The bias status indicates how much current the amplifier output devices
receive at idle. The best sonics are typically achieved in high-bias. This bias level
also generates the highest amount of radiated heat and draws the most mains
current. The unit may operate in either high or low bias state. Bias may be
switched from High to Low bias during operation.
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Ground Switch:
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Adjacent to the power connector is a toggle switch labeled ‘Gnd’. It allows the
user to change the internal grounding characteristics of the amp to prevent system
specific ground loops. The signal inputs are transformer-coupled and as such, do
not allow for grounding issues. Every system is different however, and if a
grounding issue is present, moving the ground toggle from one state to the other,
may aid in resolving power grounding issues. The chassis is ALWAYS grounded
to EARTH ground, but with the Ground toggle in the UP position, signal ground
is not tied to the chassis and earth ground. In most cases, the ground switch
should remain in the ‘down’ position. A grounded AC power cord should
ALWAYS be used with this product.
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