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5. CROSSOVER SETTINGS
5.3.3 BANDPASS FOR SUBWOOFER
SYSTEMS
To drive a subwoofer system, the integrated electronic cross-
over must also operate in bandpass mode. Before you attempt
to adjust the lowpass crossover frequency, you must first turn
the (subsonic) highpass frequency control counterclockwise
to its lowest position at 10 Hz.
Now you can set an appropriate lowpass crossover frequency.
For this purpose, open the input gain control - the arrow of the
knob should point to "noon" - so you can hear the subwoofer
playing. Ideally, the low-pass cut-off frequency should be set
between 50 to 90 Hz - and this setting has to be entirely deter-
mined by ear. Try to find lowpass crossover frequency setting,
that gives you a "full-bodied" bass reproduction with enough
impact in the upper bass range.
Note: If the lowpass crossover frequency is set too low, the
sound will have a tendency to sound extremely soft and low-
end heavy!
Adjust the subsonic-highpass, if you wish to squeeze out the
most (max-dB) of your subwoofer system. Turn the highpass
frequency control up, to a point where you can hear that the
bass reproduction starts to get "thinner". The subsonic highpass
frequency should be set to a value between 20 to maximum
50 Hz.
5.3.2 BANDPASS FOR KICKBASS
SYSTEMS
If you intend to operate a kickbass loudspeaker system in the
front doors of your vehicle, you must select two cross-over fre-
quencies at the active crossover of your RODEK amplifier. The
operation mode must be set to bandpass. The bandpass filter
contains a highpass (10 - 400Hz) with a cascaded lowpass (40
- 400Hz) filter. The lowpass
crossover frequency point is usually set at a frequency that
equals at least twice the value of the highpass
crossover frequency setting. The lowpass filter is mostly set a
little lower, than the highpass crossover frequency setting of
the satellite channels.
Kickbass speaker system, front door mounted,
recommended bandpass frequencies
16 cm Kickbass Speaker System 80 - 110 Hz Highpass
200 - 250 Hz Lowpass
Ro 1-2-4-CH Manual_D+E def.indd 28 01.03.2006 10:55:38 Uhr
28


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