RESISTOR CHART

AO

DP

VE

AR

A N T C I E O

D N

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.

Butterworth Alignment Q = .707

1% resistors used with 0.047μF caps

 

Frequency

R1

R2

 

 

 

 

20Hz

169kΩ

169kΩ

 

 

25Hz

133kΩ

133kΩ

 

 

30Hz

110kΩ

110kΩ

 

 

35Hz

95.3kΩ

95.3kΩ

 

 

40Hz

84.5kΩ

84.5kΩ

 

 

45Hz

75kΩ

75kΩ

 

 

50Hz

68.1kΩ

68.1kΩ

 

 

55Hz

61.9kΩ

61.9kΩ

 

 

60Hz

56.2kΩ

56.2kΩ

 

 

 

 

 

 

 

65Hz

52.3kΩ

52.3kΩ

 

 

70Hz

48.7kΩ

48.7kΩ

 

 

75Hz

45.3kΩ

45.3kΩ

 

 

80Hz

42.2kΩ

42.2kΩ

 

 

85Hz

40.2kΩ

40.2kΩ

 

 

90Hz

37.4kΩ

37.4kΩ

 

 

200Hz

16.9kΩ

16.9kΩ

 

 

300Hz

11.3kΩ

11.3kΩ

 

 

400Hz

8.45kΩ

8.45kΩ

 

 

 

 

 

 

 

500Hz

6.65kΩ

6.65kΩ

 

 

600Hz

5.62kΩ

5.62kΩ

 

 

700Hz

4.75kΩ

4.75kΩ

 

 

800Hz

4.22kΩ

4.22kΩ

 

 

900Hz

3.74kΩ

3.74kΩ

 

 

1kHz

3.40kΩ

3.40kΩ

 

 

1.2kHz

2.80kΩ

2.80kΩ

 

 

2kHz

1.69kΩ

1.69kΩ

 

 

3kHz

1.10kΩ

1.10kΩ

 

 

4kHz

845Ω

845Ω

 

 

 

 

 

 

 

5kHz

665Ω

665Ω

 

 

6kHz

562Ω

562Ω

 

 

7kHz

487Ω

487Ω

 

 

8kHz

422Ω

422Ω

 

 

 

 

 

 

Butterworth Alignment Q = .707

1% resistors used with 0.022μF caps

 

Frequency

R1

R2

 

 

 

 

20Hz

357kΩ

357kΩ

 

 

25Hz

287kΩ

287kΩ

 

 

30Hz

237kΩ

237kΩ

 

 

35Hz

205kΩ

205kΩ

 

 

40Hz

178kΩ

178kΩ

 

 

 

 

 

 

 

 

45Hz

162kΩ

162kΩ

 

 

50Hz

143kΩ

143kΩ

 

 

55Hz

130kΩ

130kΩ

 

 

 

 

 

 

 

 

60Hz

121kΩ

121kΩ

 

 

 

 

 

 

 

 

65Hz

110kΩ

110kΩ

 

 

70Hz

102kΩ

102kΩ

 

 

75Hz

95.3kΩ

95.3kΩ

 

 

80Hz

90.9kΩ

90.9kΩ

 

 

85Hz

84.5kΩ

84.5kΩ

 

 

90Hz

80.6kΩ

80.6kΩ

 

 

200Hz

35.7kΩ

35.7kΩ

 

 

300Hz

23.7kΩ

23.7kΩ

 

 

400Hz

17.8kΩ

17.8kΩ

 

 

 

 

 

 

 

 

500Hz

14.3kΩ

14.3kΩ

 

 

600Hz

12.1kΩ

12.1kΩ

 

 

700Hz

10.2kΩ

10.2kΩ

 

 

800Hz

9.9kΩ

9.9kΩ

 

 

900Hz

8.6kΩ

8.6kΩ

 

 

1.0kHz

7.15kΩ

7.15kΩ

 

 

1.2kHz

6.04kΩ

6.04kΩ

 

 

2.0kHz

3.57kΩ

3.57kΩ

 

 

3.0kHz

2.37kΩ

2.37kΩ

 

 

4.0kHz

1.76kΩ

1.76kΩ

 

 

 

 

 

 

 

 

5.0kHz

1.43kΩ

1.43kΩ

 

 

6.0kHz

1.21kΩ

1.21kΩ

 

 

7.0kHz

1.02kΩ

1.02kΩ

 

 

8.0kHz

909Ω

909Ω

 

 

 

 

 

 

 

 

– 15 –

Page 18
Image 18
Rockford Fosgate 125.2, 75.2, 55.2, 225.2 manual Resistor Chart, Butterworth Alignment Q =

225.2, 125.2, 55.2, 75.2 specifications

Rockford Fosgate has long been recognized for delivering high-quality audio solutions for car enthusiasts, and the 225.2, 125.2, 55.2, and 75.2 amplifiers are no exception. These amplifiers cater to various audio needs, whether you are looking to enhance the sound quality in your vehicle or set up a full-fledged audio system.

The Rockford Fosgate 225.2 is a powerful two-channel amplifier that offers a maximum power output of 225 watts. It features a MOSFET power supply, providing excellent efficiency and reliability under load. The 225.2 also includes a low-pass filter and built-in crossover, enabling users to tailor the sound to fit specific audio preferences by adjusting the frequency response. Its sleek design and durable construction ensure it can withstand the demands of a mobile environment.

Meanwhile, the 125.2 amplifier is designed for those who want a compact yet powerful audio solution. This two-channel amplifier delivers 125 watts of peak power and incorporates advanced technologies such as a high-level input, allowing for easy integration into factory systems. The 125.2 also features adjustable bass boost to enhance low-frequency performance, making it an attractive choice for those who enjoy bass-heavy music genres.

On the other hand, the Rockford Fosgate 55.2 amplifier is a more compact offering. Despite its smaller size, it provides impressive sound quality and power output of 55 watts per channel. Ideal for adding an extra punch to factory speakers, the 55.2 utilizes a low-impedance design to maximize efficiency. It is particularly well-suited for entry-level audio systems, making it accessible for those just starting in car audio.

Lastly, the 75.2 amplifier strikes a balance between size, power, and versatility, delivering 75 watts per channel. With features like thermal and overload protection, the 75.2 ensures both safety and performance under stress. The compact form factor makes it easy to install in various vehicle models without sacrificing audio quality.

All of these amplifiers showcase Rockford Fosgate's commitment to sound quality, durability, and user-friendly design. Each model incorporates technologies that enhance performance while offering flexibility for customization, making them excellent choices for car audio enthusiasts looking to elevate their listening experience. Whether you need a compact solution for upgraded sound or a powerhouse for a full system, Rockford Fosgate has options that cater to every need.