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10. Perform a final check of the completed system wiring to ensure that all connections are
accurate. Check all power and ground connections for frayed wires and loose connections
which could cause problems.
NOTE: Follow the diagrams for proper signal polarity.
CAUTION: These amplifiers are not recommended for impedance loads below 2Ω.
!
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.
L
6dB/Octave Low-Pass
Speaker Impedance
Freq.
2 OHMS
Hertz
L
C
80
4.1mH 1000µF
100
3.1mH
800µF
130
2.4mH
600µF
200
1.6mH
400µF
260
1.2mH
300µF
400
.8mH
200µF
600
.5mH
136µF
800
.41mH
100µF
1000
.31mH
78µF
1200
.25mH
66µF
1800
.16mH
44µF
4000
.08mH
20µF
6000
51mH
14µF
9000
34mH
9.5µF
12000
25mH
6.6µF
L = Low-Pass (Inductor)
C = High-Pass (Capacitor)
For more information, see your Authorized Rockford
C
6dB/Octave High-Pass
4 OHMS
L
C
8.2mH
500µF
6.2mH
400µF
4.7mH
300µF
3.3mH
200µF
2.4mH
150µF
1.6mH
100µF
1.0mH
68µF
.82mH
50µF
.62mH
39µF
.51mH
33µF
.33mH
22µF
.16mH
10µF
.10mH
6.8µF
68mH
4.7µF
51mH
3.3µF 100mH
Fosgate Dealer.
I
NSTALLATION
8 OHMS
L
C
16mH
250µF
12mH
200µF
10mH
150µF
6.8mH
100µF
4.7mH
75µF
3.3mH
50µF
2.0mH
33µF
1.6mH
26µF
1.2mH
20µF
1.0mH
16µF
.68mH
10µF
.33mH
5µF
.20mH
3.3µF
.15mH
2.2µF
1.6µF
7
