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 GdB/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 GdB/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 pas-
sive 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: The Lightning Audio amplifiers are not recommended for impedance loads below 2Q stereo and 4Q
bridged (mono) loads.
iw
I YJ
6dB/Octave Low-Pass
6dB/Octave High-Pass
:req
iertz
Speaker Impedance
2 OHMS
4 OHMS 8 OHMS
oHam@a
80 41mH 1 OOOmF 8 2mH 500mF 16mH 250mF
100 3 ImH 800mF 6 2mH 400mF
12mH 200mF
130 2 4mH 600mF
4 7mH 300mF 1OmH 150mF
2: ; Ei Ez 2 3 4mH 3mH :~E~
4 6 8mH 7mH 1OOmF 75mF
400 8mH 200mF 1 6mH 100mF 3 3mH 50mF
600 5mH 136mF
1 OmH 68mF 2 OmH 33mF
800 41mH 100mF
82mH 50mF 1 6mH 26mF
1000
31mH 78mF 62mH 39mF 1 2mH 20mF
L = Low-Pass (Inductor)
C = High-Pass (Capacitor)
For more information, see your Authorized Lightning Audio Dealer
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