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ACCESSORIES/OPTIONS
5.1 Input Sensitivity Option
The Micro-Tech is factory-set for a sensitivity of 0.775
volt in for rated power out. If desired, you can change
the sensitivity to 2.2 volts in for rated power out.
The 0.775-volt sensitivity degrades the signal-to-noise
specification slightly. But because of the low noise
guaranteed in the Micro-Tech, the 3 - 5 d B of additional
noise will most likely go unnoticed.
For 2.2-volt sensitivity, simply clip out R 1 6 5 , R 1 6 6 ,
R265 and R266. To do this, remove the bottom cover
and locate the conveniently labeled parts on the main
circuit board.
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5.2 Cooling Fan Option
Your Micro-Tech comes with a built-in high-velocity
fan for optimum cooling. Included in your accessory
kit is a low-velocity fan that provides adequate cooling
in most cases and produces less noise than the high-
velocity fan.
Crown h a s m a d e r e p l a c i n g the original f a n quite
simple. After removing the bottom cover, slip the
original fan off the transmotor shaft and press on the
low-velocity fan. The metal clip on the fan should be
toward the motor. Replace the cover.
If you can hold your hand on the side of the amplifier
while it's driving the desired load, it's cool enough.
Otherwise, use the high-velocity fan; and, if necessary,
augment the air flow with a rack-cabinet fan. If the rack
fan blows air into the rack (ratherthan drawing air out),
order a reverse-air-flow fan from Crown (Part No. C
6 4 9 7 - 9 ) for your Micro-Tech. Filter the air entering the
rack.
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SECTION 5
5 - 1
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