Owner's Manual Car Stereo Preamplifier RUBICON 502 702 1002

The RUBICON amplifiers incorporate an on-board staggered elec-
tronic crossover, with RCA outputs to drive an external amplifier. No
external electronic crossover is necessary. The high and low pass
portions of the crossover can be set independently of one another.
To engage the High Pass filter, set the left crossover switch on the
top of the amplifier to “H.P. X-OVER”, and use the frequency adjust-
ment knob marked “H.P. X-OVER”. To engage the Low Pass filter,
set the left crossover switch to either “SUB SONIC” or “HAWKINS
BASS CONTROL” (see pages 1 O-1 1 for more details), and set the
right crossover switch “L.P. X-OVER” to the “IN” position.
In many car audio installations, there is a tendency for a “midbass
boom.” Because of their interior dimensions, most cars will reso-
nate or ring at these midbass frequencies. If we design the system
so there is reduced output in this region, the final response is very
smooth and natural sounding. The high pass cossover is indepen-
dently variable from 70 to 160 Hz at 12 dB/Octave, and the low pass
crossover is independently variable from 55 to 220 Hz at 24 dB/Oc-
tave.
For initial crossover setup, try setting the low pass filter to approxi-
mately 60 Hz, and the high pass filter to approximately 100 Hz.
Change the crossover points to accommodate a good mixture of
frequency response, power handling, and personal preference.
Cros
Crossover
.L P
HP XOVER-73 192 Hz
XOVER HA’NWS l 30 70Hz
I ’
SLBSCNC l 13 30Hz
blF~R7%N~ Do not have the law Pass filter and the High
Pass filter buth engaged at the same time.
While this won’t
damage the amplifier, the frquency range of the amplified sig-
nal will be severJ’y limited.
.
12 d6Dctave High Pass
24 dB/Octave Low Pass
9