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CROSSOVER and GAIN CONTROL
Crossover
Your new
POWERCLASS
™
amplifier has a 90Hz fourth-order
Linkwitz-Riley type, 24dB per octave phase correlated
crossover built in to provide system flexibility without the added
expense and installation of an outboard crossover. The speaker
outputs of your amplifier are high pass or low pass according
to the HP/LP switch on the front endplate.
You would choose low pass (switch out) to use this amp for
subwoofers, or choose high pass (switch in) to use this amp
for full range speakers. The RCA outputs are controlled by the
same HP/LP switch, but are always the inverse of the speaker
output crossover. If the HP/LP switch is out (LP) the RCA
outputs will be high pass, and if the HP/LP switch is in (HP) the
RCA outputs will be low pass. In addition, the speaker outputs
can be all pass (no crossover) by setting the XOVER ON/OFF
switch to the off (out) position.
NOTE: The RCA outputs are always crossed over. The System
Diagrams beginning on page 14 show several ways to use the
internal crossover in your system.
Adjusting The Amplifier Input Gain
1. Adjust all amplifier input gain controls to just above minimum
sensitivity (fully counterclockwise).
2. Using the cleanest source (CD), with music playing turn up
the head unit until you can hear distortion. Now turn it down a
bit until you cannot hear the distortion.
3. Increase the Amplifier gain (clockwise) until the onset of
audible distortion. Then decrease the gain to the point just
before the distortion starts. This setting minimizes background
noise and prevents overload.
4. Repeat step 3 for any remaining amplifiers in the system.
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