Resistor Chart - Rockford Fosgate 125.2 Operation & Installation

R C
ESISTOR
Our tests have shown that using 0.047 f capacitors for frequencies below 100Hz, and 0.022 f
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.
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
85Hz 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
HART
R1 R2
169k
133k
110k
95.3k
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
1% resistors used with 0.022 F caps
Frequency
20Hz
25Hz
30Hz
35Hz
40Hz
45Hz
50Hz
55Hz
60Hz
65Hz
70Hz
75Hz
80Hz
85Hz
90Hz
200Hz
300Hz
400Hz
500Hz
600Hz
700Hz
800Hz
900Hz
1.0kHz
1.2kHz
2.0kHz
3.0kHz
4.0kHz
5.0kHz
6.0kHz
7.0kHz
8.0kHz
– 15 –
R1 R2
357k 357k
287k 287k
237k 237k
205k 205k
178k 178k
162k 162k
143k 143k
130k 130k
121k 121k
110k 110k
102k 102k
95.3k 95.3k
90.9k 90.9k
84.5k 84.5k
80.6k 80.6k
35.7k 35.7k
23.7k 23.7k
17.8k 17.8k
14.3k 14.3k
12.1k 12.1k
10.2k 10.2k
9.9k 9.9k
8.6k 8.6k
7.15k 7.15k
6.04k 6.04k
3.57k 3.57k
2.37k 2.37k
1.76k 1.76k
1.43k 1.43k
1.21k 1.21k
1.02k 1.02k
909 909
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