Owner's Manual and Installation Guide 5/3 Channel Power Amplifiers 255, 355, 555

The RUBICON amplifiers incorporate an on-board staggered electronic cross-
over, with RCA outputs (RUBICON only) to drive an external amplifier. No
external electronic crossover is necessary. However, if you do desire to use an
external crossover you still have that option. The high and low pass portions of
the crossover can be set independently of one another.
In many car audio installations, there is a tendency for a “midbass boom.” Be-
cause of their interior dimensions, most cars will resonate 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 crossover is
independently variable from 50 to 500 Hz at 12 dB/Octave (Removable SIP @
150Hz on RUBICON255. See next page for different frequencies)! and the low
pass crossover is independently variable from 55 to 220 Hz at 24 dB/Octave.
For initial crossover setup, try setting the low pass filter to approximately 60 Hz,
and the high pass filter to approximately 150 Hz. Change the crossover points to
accommodate a good mixture of frequency response, power handling, and per-
sonal preference.
29WAY
12 dB/Octave High Pass
-xx
12
31WAY (555 ONLY)
MIDBASS/MIDRANGE BAND PASS
The RUBICON can be operated in midrange or midbass “band pass” con-
figuration. In the three way mode, you can tri-amplify with “active” midbass or
midrange to maximize control over individual drivers. The bandpass includes
a low pass and high pass filter, which work independent of one another, to
drive the midrange or midbass speakers.
39WAY
,
12 dB!Octave
24 dB/Octave
SIP CROSSOVER (255 ONLY)
The RUBICON comes with a 150Hz High Pass S.I.P. .
(Series In-line Package resistor network) I If you want to use
a frequency other than the factory pre-set frequencies follow
the chart to the left or the formula below to select your own