Xcard Resistor Chart - Rockford Fosgate 250.1 Operation & Installation

XC R
A R D
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 capacitors
Frequency R1
20Hz 169k
25Hz 133k
30Hz 110k
35Hz 95.3k
40Hz 84.5k
45Hz 75k
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
1.0kHz 3.40k
1.2kHz 2.80k
2kHz 1.69k
3kHz 1.10k
4kHz 845
5kHz 665
6kHz 562
7kHz 487
8kHz 422
C
ESISTOR
R2
169k
133k
110k
95.3k
84.5k
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
665
562
487
422
HART
Butterworth Alignment Q = .707
1% resistors used with 0.022 F capacitors
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
86k 86k
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
10.2k 10.2k
909 909
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