Lightning Audio S1.1000D, S1.600D manual Using PAssiVe CrossoVers

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 (combina- tion 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.

L

C

6dB/Octave Low-Pass6dB/Octave High-Pass

Freq.		Speaker Impedance
Hertz
	2 OHMS	4 OHMS	8 OHMS

	L		C	L		C	L		C
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

L = Low-Pass (Inductor)

C = High-Pass (Capacitor)

For more information, see your Authorized Lightning Audio Dealer.

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