Resistor Chart - Rockford Fosgate punch 40X2 Operating & Installation

R
ESISTOR
Use the resistor charts below to modify the factory shipped 100Hz XCard.
Butterworth Alignment Q = .707
1% resistors used with 0.047 F caps
Frequency
20Hz 169k
25Hz 133k
30Hz 110k
35Hz 95.3k
40Hz 84.5k
45Hz
50Hz 68.1k
55Hz 61.9k
60Hz 56.2k
65Hz 52.3k
70Hz 48.7k
75Hz 45.3k
80Hz 42.2k
84Hz 40.2k
90Hz 37.4k
200Hz 16.9k
300Hz 11.3k
400Hz 8.45k
500Hz 6.65k
600Hz 5.62k
700Hz 4.75k
800Hz 4.22k
900Hz 3.74k
1kHz 3.40k
1.2kHz 2.80k
2kHz 1.69k
3kHz 1.10k
4kHz
5kHz
6kHz
7kHz
8kHz
C
HART
R1 R2
169k
133k
110k
95.3
84.5k
75k 75k
68.1k
61.9k
56.2k
52.3k
48.7k
45.3k
42.2k
40.2k
37.4k
16.9k
11.3k
8.45k
6.65k
5.62k
4.75k
4.22k
3.74k
3.40k
2.80k
1.69k
1.10k
845 845
665 665
562 562
487 487
422 422
Butterworth Alignment Q = .707
5% resistors used with 0.047 F caps
Frequency
21Hz
26Hz
30.8Hz
37Hz
41Hz
45Hz
49.8Hz
54.6Hz
60.5Hz
66.4Hz
72Hz
N/A
78.7Hz
86.8Hz
94Hz
212Hz
308Hz
413Hz
498Hz
605Hz
720Hz
787Hz
940Hz
1kHz
1.2kHz
2.1kHz
3kHz
4.1kHz
5kHz
6kHz
7.2kHz
7.9kHz
– 13 –
R1 R2
160k 160k
130k 130k
110k 110k
91k 91
82k 82k
75k 75k
68k 68k
62k 62k
56k 56k
51k 51k
47k 47k
N/A N/A
43k 43k
39k 39k
36k 36k
16k 16k
11k 11k
8.2k 8.2k
6.8k 6.8k
5.6k 5.6k
4.7k 4.7k
4.3k 4.3k
3.6k 3.6k
3.3k 3.3k
2.7k 2.7k
1.6k 1.6k
1.1k 1.1k
820 820
680 680
560 560
470 470
430 430
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