Lightning-audio FF150.2 User Manual download pdf (Page 7)

Installation

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: The Lightning Audio amplifiers are not recommended for impedance

loads below 2Ω stereo and 4Ω bridged (mono) loads.

80 4.1mH 1000µF 8.2mH 500µF 16mH 250µF

100 3.1mH 800µF 6.2mH 400µF 12mH 200µF

130 2.4mH 600µF 4.7mH 300µF 10mH 150µF

200 1.6mH 400µF 3.3mH 200µF 6.8mH 100µF

260 1.2mH 300µF 2.4mH 150µF 4.7mH 75µF

400 .8mH 200µF 1.6mH 100µF 3.3mH 50µF

600 .5mH 136µF 1.0mH 68µF 2.0mH 33µF

800 .41mH 100µF .82mH 50µF 1.6mH 26µF

1000 .31mH 78µF .62mH 39µF 1.2mH 20µF

1200 .25mH 66µF .51mH 33µF 1.0mH 16µF

1800 .16mH 44µF .33mH 22µF .68mH 10µF

4000 .08mH 20µF .16mH 10µF .33mH 5µF

6000 51mH 14µF .10mH 6.8µF .20mH 3.3µF

9000 34mH 9.5µF 68mH 4.7µF .15mH 2.2µF

12000 25mH 6.6µF 51mH 3.3µF 100mH 1.6µF

Freq.

Hertz

Speaker Impedance

2 OHMS

8 OHMS

4 OHMS

L L

C C

6dB/Octave Low-Pass

6dB/Octave High-Pass

L = Low-Pass (Inductor)

C = High-Pass (Capacitor)

For more information, see your

Authorized Lightning Audio

Dealer.

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Lightning-audio FF150.2 User Manual Page 7

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