Rockford Fosgate FNX-1406F - Manual (Page 12)

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Bandpassing the Midrange
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• The Fanatic Component Systems are optimized for full range music reproduc-
tion. In cases where a subwoofer is used, the midrange can be bandpassed in
order to prevent overlapping frequencies from the midrange into the
subwoofer.
1.Determine the frequency range that the subwoofer will play (i.e.: 20Hz-80Hz)
2.Use the low-pass crossover frequency of the subwoofer system (i.e.: 80Hz) as
the high-pass crossover frequency for the midrange
3.Select the appropriate capacitor value (i.e.: 500
µ
F) to properly bandpass the
midrange
4.Place the capacitor in series with the “+” terminal of the speaker
Frequency Speaker
Hertz (4 ohms)
C1
80Hz 500
µ
F
100Hz 400
µ
F
130Hz 300
µ
F
200Hz 200
µ
F
260Hz 150
µ
F
400Hz 100
µ
F
+
TWEETER INPUT
-
MIDRANGE
+ - + -
+
–
0dB
–3dB
80Hz
Subwoofer Midrange Tweeter
C1
6dB/octave HP