Lighting Audio STORM X1.400.2 Installation Et Fonctionnement page 9

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.
All manuals and user guides at all-guides.com
6dB/Octave Low-Pass
Freq.
Hertz
L
80 4.1mH 1000mF
100 3.1mH 800mF
130 2.4mH 600mF
200 1.6mH 400mF
260 1.2mH 300mF
400 .8mH 200mF
600 .5mH 136mF
800 .41mH 100mF
1000 .31mH
1200 .25mH
1800 .16mH
4000 .08mH
6000 51mH
9000 34mH
12000 25mH
For more information, see your Authorized Lightning
L
6dB/Octave High-Pass
Speaker Impedance
2 OHMS 4 OHMS
C L
8.2mH 500mF
6.2mH 400mF
4.7mH 300mF
3.3mH 200mF
2.4mH 150mF
1.6mH 100mF
1.0mH
.82mH
78mF .62mH
66mF .51mH
44mF .33mH
20mF .16mH
14mF .10mH 6.8mF
9.5mF 68mH 4.7mF
6.6mF 51mH 3.3mF 100mH
L = Low-Pass (Inductor)
C = High-Pass (Capacitor)
Audio Dealer.
C
8 OHMS
C L C
16mH 250mF
12mH 200mF
10mH 150mF
6.8mH 100mF
4.7mH 75mF
3.3mH 50mF
68mF 2.0mH 33mF
50mF 1.6mH 26mF
39mF 1.2mH 20mF
33mF 1.0mH 16mF
22mF .68mH 10mF
10mF .33mH 5mF
.20mH 3.3mF
.15mH 2.2mF
1.6mF
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