Alpine CDA-7998 About the Crossover, 8-EN, Basic Operation, way mode, Slope, speaker, range

Basic Operation

About the Crossover

Crossover:

This unit is equipped with an Active Crossover. The crossover limits the frequencies delivered to the outputs. Each channel is controlled independently. Thus, each speaker pair can be driven by the frequencies for which they have been optimally designed.

The crossover adjusts the HPF (high pass filter) or LPF (low pass filter) of each band, and also the slope (how fast the filter rolls off the highs or lows).

2 way mode

	Cut-off frequency		Slope
	(1/3 octave steps)
					Level
	HPF	LPF	HPF	LPF
Low range				FLAT, 6,
	----	20 Hz -	----	12, 18,	0 to
speaker		200 Hz		24 dB/oct	−12 dB
Front high	20 Hz -		FLAT, 6,		0 to
range		----	12, 18,	----
	200 Hz				−12 dB
speaker			24 dB/oct
Rear high	20 Hz -		FLAT, 6,		0 to
range		----	12, 18,	----
	200 Hz				−12 dB
speaker			24 dB/oct

Adjustments should be made according to the reproduction characteristics of the speakers. Depending on the speakers, a passive network may not be necessary. If you are unsure about this point, please consult your authorized Alpine dealer.

3 way mode

	ww frequency		Slope
	(1/3 octave steps)
					Level
	HPF	LPF	HPF	LPF
Low range	----	20 Hz -	----	FLAT, 6,	0 to
				12, 18,
speaker		200 Hz			− 12 dB
				24 dB/oct
Mid range	20 Hz -	20 Hz -	FLAT, 6,	FLAT, 6,	0 to
			12, 18,	12, 18,
speaker	200 Hz	20 kHz			−12 dB
			24 dB/oct	24 dB/oct
High range	1 kHz -	----	6, 12, 18,	----	0 to
speaker*	20 kHz		24 dB/oct		−12 dB

Low range	High range
(Different from actual display)

∗When setting the high range HPF filter to FLAT, do not turn up the volume too much. This may damage the speaker.

Low range	Mid range	High range
(Different from actual display)

Output frequency range

Level adjusting (0 to - 12 dB)

Slope FLAT

Slope adjusting

20 Hz	(Different from actual display)
HPF cut-off	LPF cut-off
frequency	frequency

NOTES

•HPF (high pass filter): Cuts the lower frequencies and allows the higher frequencies to pass.

•LPF (low pass filter): Cuts the higher frequencies and allows the lower frequencies to pass.

•Slope: The level change (in dB) for a frequency change of one octave.

•The higher the slope value, the steeper the slope becomes.

•Adjust the slope to FLAT to bypass the HP or LP filters.

•Do not use a tweeter without the HPF on or set to a low frequency, as it may cause damage to the speaker due to the low frequency content.

•You cannot adjust the crossover frequency higher than the HPF or lower than the LPF.

8-EN