About the Crossover

Basic Operation

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)		Slope
	(1/3 octave steps)				Level
					Level

	HPF	LPF	HPF	LPF

Low range				FLAT, 6,
Low range	----	20 Hz -	----	12, 18,	0 to
speaker	----	200 Hz	----	24 dB/oct	−12 dB
speaker		200 Hz		24 dB/oct	−12 dB

Front high	20 Hz -		FLAT, 6,		0 to
range	20 Hz -	----	12, 18,	----	0 to
range	200 Hz	----	12, 18,	----	−12 dB
speaker	200 Hz		24 dB/oct		−12 dB
speaker			24 dB/oct

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

	HPF	LPF	HPF	LPF

Low range	----	20 Hz -	----	FLAT, 6,	0 to
Low range		20 Hz -		12, 18,	0 to
speaker		200 Hz		12, 18,	− 12 dB
speaker		200 Hz		24 dB/oct	− 12 dB
				24 dB/oct

Mid range	20 Hz -	20 Hz -	FLAT, 6,	FLAT, 6,	0 to
Mid range	20 Hz -	20 Hz -	12, 18,	12, 18,	0 to
speaker	200 Hz	20 kHz	12, 18,	12, 18,	−12 dB
speaker	200 Hz	20 kHz	24 dB/oct	24 dB/oct	−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
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

CDA-7897 specifications

The Alpine CDA-7897 is a versatile and high-performance CD receiver that appeals to audiophiles and casual listeners alike. Renowned for its rich feature set and exceptional sound quality, the CDA-7897 is designed to enhance the in-car audio experience.

One of the standout features of the CDA-7897 is its direct connectivity options. The unit offers multiple inputs, including a front auxiliary input and USB connectivity for playing digital music files. This allows users to easily connect their smartphones or MP3 players directly to the receiver, ensuring that their favorite tunes are always within reach. The receiver is also compatible with Alpine's full-speed iPod connection, which allows for seamless control and playback of iPod music.

The CDA-7897 boasts impressive sound processing capabilities. Its built-in 24-bit digital-to-analog converter (DAC) offers superior audio clarity and fidelity, ensuring that even the most intricate details in music are faithfully reproduced. Additionally, the unit features extensive tuning options, including a 3-band parametric EQ and adjustable crossover settings, allowing users to customize their audio output to their liking. The included built-in amplifier provides a robust 50 watts per channel, delivering powerful sound that fills the car with rich, dynamic audio.

Another noteworthy aspect of the CDA-7897 is its sleek and user-friendly design. The receiver features a stylish front panel with a detachable faceplate for added security. The intuitive interface allows for easy navigation through menus and options, making it simple for users to adjust settings while on the road.

In terms of expandability, the CDA-7897 offers several options for enhancing your audio system. It includes preamp outputs for additional amplifiers and speakers, allowing users to build a more powerful setup over time. The unit also supports a variety of audio formats, including MP3 and WMA, ensuring playback compatibility across different music libraries.

Overall, the Alpine CDA-7897 is a feature-rich CD receiver that combines high-quality audio performance with modern connectivity options. Its blend of technology, customization, and user-friendly design solidifies its place as a top choice for car audio enthusiasts seeking an engaging listening experience. Whether cruising down the highway or parked at a gathering, the CDA-7897 delivers an impressive audio performance that elevates any journey.

Basic Operation