Using Passive Crossovers - Rockford Fosgate Punch serie Einbau Und Betrieb

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NSTALLATION

USING PASSIVE CROSSOVERS

A passive crossover is a circuit that uses capacitors and/or coils and is placed on speaker leads
between the amplifier and speaker. The crossover delegates a specific range of frequencies to the
speaker for optimum driver performance. A crossover network can perform one of three functions:
High-Pass (capacitors), Low-Pass (inductors or coils) and Bandpass (combination of capacitor and
coil).
The most commonly used passive crossover networks are 6dB/octave systems. These are easy to
construct and require one component per filter. Placing this filter in series with the circuit will
reduce power to the speaker by 6dB/octave above or below the crossover point depending on
whether it is a high-pass or low-pass filter. More complex systems such as 12dB/octave or
18dB/octave can cause impedance problems if not professionally designed.
Passive crossovers are directly dependent upon the speaker's impedance and component value for
accuracy. When passive crossover components are used in multiple speaker systems, the crossover's
effect on the overall impedance should be taken into consideration along with the speaker's
impedance when determining amplifier loads.
CAUTION: These amplifiers are not recommended for impedance loads below 2Ω
!
C = High-Pass (Capacitor)
For more information, see your
Authorized Rockford Fosgate Dealer.
10
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stereo and 4Ω bridged (mono).
L
6dB/Octave Low-Pass
C
6dB/Octave High-Pass
L = Low-Pass (Inductor)
manuals search engine
Speaker Impedance
Freq.
2 OHMS
Hertz
L C
80 4.1mH 1000µF 8.2mH
100 3.1mH 800µF 6.2mH
130 2.4mH 600µF 4.7mH
200 1.6mH 400µF 3.3mH
260 1.2mH 300µF 2.4mH
400 .8mH 200µF 1.6mH
600 .5mH 136µF 1.0mH
800 .41mH 100µF .82mH
1000 .31mH 78µF .62mH
1200 .25mH 66µF .51mH
1800 .16mH 44µF .33mH
4000 .08mH 20µF .16mH
6000 51mH 14µF .10mH
9000 34mH 9.5µF 68mH
12000 25mH 6.6µF 51mH
4 OHMS
8 OHMS
L C L C
500µF 16mH 250µF
400µF 12mH 200µF
300µF 10mH 150µF
200µF 6.8mH 100µF
150µF 4.7mH 75µF
100µF 3.3mH 50µF
68µF 2.0mH 33µF
50µF 1.6mH 26µF
39µF 1.2mH 20µF
33µF 1.0mH 16µF
22µF .68mH 10µF
10µF .33mH 5µF
6.8µF .20mH 3.3µF
4.7µF .15mH 2.2µF
3.3µF 100mH 1.6µF