Rockford Fosgate 125.2 Stereo Amplifier User Manual


 
R
ESISTOR
C
HART
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Frequency R1 R2
20Hz 169k
169k
25Hz 133k 133k
30Hz 110k 110k
35Hz 95.3k 95.3k
40Hz 84.5k 84.5k
45Hz 75k 75k
50Hz 68.1k 68.1k
55Hz 61.9k 61.9k
60Hz 56.2k 56.2k
65Hz 52.3k 52.3k
70Hz 48.7k 48.7k
75Hz 45.3k 45.3k
80Hz 42.2k 42.2k
85Hz 40.2k 40.2k
90Hz 37.4k 37.4k
200Hz 16.9k 16.9k
300Hz 11.3k 11.3k
400Hz 8.45k 8.45k
500Hz 6.65k 6.65k
600Hz 5.62k 5.62k
700Hz 4.75k 4.75k
800Hz 4.22k 4.22k
900Hz 3.74k 3.74k
1kHz 3.40k 3.40k
1.2kHz 2.80k 2.80k
2kHz 1.69k 1.69k
3kHz 1.10k 1.10k
4kHz 845 845
5kHz 665 665
6kHz 562 562
7kHz 487 487
8kHz 422 422
Butterworth Alignment Q = .707
1% resistors used with 0.047µF caps
Butterworth Alignment Q = .707
1% resistors used with 0.022µF caps
Our tests have shown that using 0.047µf capacitors for frequencies below 100Hz, and 0.022µf
capacitors for frequencies above 100Hz, result in more linear crossover control. Refer to the
Specifications page to determine the capacitor value of each supplied XCard.
a
d
v
a
n
c
e
d
O
p
e
r
a
t
i
o
n
Frequency R1 R2
20Hz 357k 357k
25Hz 287k 287k
30Hz 237k 237k
35Hz 205k 205k
40Hz 178k 178k
45Hz 162k 162k
50Hz 143k 143k
55Hz 130k 130k
60Hz 121k 121k
65Hz 110k 110k
70Hz 102k 102k
75Hz 95.3k 95.3k
80Hz 90.9k 90.9k
85Hz 84.5k 84.5k
90Hz 80.6k 80.6k
200Hz 35.7k
35.7k
300Hz 23.7k 23.7k
400Hz 17.8k 17.8k
500Hz 14.3k 14.3k
600Hz 12.1k 12.1k
700Hz 10.2k 10.2k
800Hz 9.9k 9.9k
900Hz 8.6k 8.6k
1.0kHz 7.15k 7.15k
1.2kHz 6.04k 6.04k
2.0kHz 3.57k 3.57k
3.0kHz 2.37k 2.37k
4.0kHz 1.76k 1.76k
5.0kHz 1.43k 1.43k
6.0kHz 1.21k 1.21k
7.0kHz 1.02k 1.02k
8.0kHz 909 909