Lc c c, Installation, Speaker impedance – Lightning Audio X1.400.2 User Manual

Page 9

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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 2

Ω stereo and 4Ω bridged (mono) loads.

9

Installation

80

4.1mH 1000mF

8.2mH

500mF

16mH

250mF

100

3.1mH

800mF

6.2mH

400mF

12mH

200mF

130

2.4mH

600mF

4.7mH

300mF

10mH

150mF

200

1.6mH

400mF

3.3mH

200mF

6.8mH

100mF

260

1.2mH

300mF

2.4mH

150mF

4.7mH

75mF

400

.8mH

200mF

1.6mH

100mF

3.3mH

50mF

600

.5mH

136mF

1.0mH

68mF

2.0mH

33mF

800

.41mH

100mF

.82mH

50mF

1.6mH

26mF

1000

.31mH

78mF

.62mH

39mF

1.2mH

20mF

1200

.25mH

66mF

.51mH

33mF

1.0mH

16mF

1800

.16mH

44mF

.33mH

22mF

.68mH

10mF

4000

.08mH

20mF

.16mH

10mF

.33mH

5mF

6000

51mH

14mF

.10mH

6.8mF

.20mH

3.3mF

9000

34mH

9.5mF

68mH

4.7mF

.15mH

2.2mF

12000

25mH

6.6mF

51mH

3.3mF 100mH

1.6mF

Freq.

Hertz

Speaker Impedance

2 OHMS

8 OHMS

4 OHMS

L

L

L

C

C

C

6dB/Octave Low-Pass

6dB/Octave High-Pass

L

C

L = Low-Pass (Inductor)

C = High-Pass (Capacitor)

For more information, see your Authorized Lightning

Audio Dealer.

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