Precision Power PC4200 - Manual (Page 17)

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Q BASS PLUS ™ Settings
1 2 Freq.
IN IN 30Hz
IN OUT 36Hz
OUT IN 44Hz
OUT OUT 60Hz
Q BASS ™
and
Q BASS REMOTE ™
15
CAUTION: QBASS ™ and QBASS PLU S ™ should only be used in
systems with strong subwoofers. 18dB is a lot of bass boost and
could damage full range speakers.
+18dB
+6dB
0dB
30Hz 36Hz 44Hz 60Hz
Q = 4 Q = 2
+12dB
QBASS PLUS ™
Q BASS ™
For extra BOOM from your system, we've developed the
QBASS
™ bass control circuit. The QBASS control is located
to the left of the speaker outputs, and allows you to add up to
12dB of boost centered at 40Hz by rotating the control clockwise.
QBASS™
QBASS ™ Is a standard feature on the PC4200/PC4400.
Q BASS PLUS ™
On PC4800 and PC6600 amplifiers, we've taken bass control
to a higher level with QBASS PLUS ™ .
The two QBASS switches
(labeled 1 and 2) on the front end of the amplifier allow you
to select one of four frequency centers - 30Hz, 36Hz, 44Hz
and 60Hz. The Q SELECT switch determines the width of
boosted frequencies. A 'Q' of 2 (switch out) will give you a
wide boost while a 'Q' of 4 will boost a narrow range of
frequencies. (See chart below.) On the rear end panel you
will find the
QBASS PLUS ™ level control and the plug-in
for an optional QBASS REMOTE ™ level control. Adjust the
level control clockwise for up to 18dB of boost at your
selected frequency and Q.