Bandpass For Kickbass Systems; Bandpass For Subwoofer Systems - RoDEK R680A2 Installationsanleitung

4. CROSSOVER SETTINGS
4.2.2 BANDPASS FOR KICKBASS
SYSTEMS
If you intend to operate a kickbass loudspeaker system in the
front doors of your vehicle, you must select two crossover
frequencies at the active crossover of your RODEK amplifier.
The operation mode of the channel pair driving the kickbass
speaker system must be set to BP (bandpass). The bandpass
filter contains a highpass (10 - 400Hz) with a cascaded lowpass
(30 - 400Hz) filter. The lowpass crossover point is usually set at
a frequency that equals at least twice the value of the highpass
crossover frequency setting. The lowpass filter frequency is
mostly set a little lower, than the highpass crossover frequency
of the satellite channels.
Kickbass speaker system, front door mounted, recommended
bandpass frequencies
16 cm Kickbass Speaker System 80 - 110 Hz Highpass
24
200 - 250 Hz Lowpass
4.2.3 BANDPASS FOR SUBWOOFER
SYSTEMS
To drive a subwoofer system, the integrated electronic cross-
over of the channels CH5/6 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!
Now you can 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.