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-7998 specifications

The Alpine CDA-7998 is a high-performance car audio receiver renowned for its advanced features and superior sound quality. Designed for audiophiles and car enthusiasts alike, this model combines cutting-edge technology with a user-friendly interface to enhance the in-car listening experience.

One of the standout features of the CDA-7998 is its exceptional audio quality. The receiver is equipped with a 24-bit digital-to-analog converter (DAC), which processes sound with unparalleled precision, reducing distortion and increasing clarity. This technology allows users to enjoy their favorite music with exceptional accuracy, making every note and tone come alive.

Another remarkable aspect of the CDA-7998 is its versatile connectivity options. The unit includes a front USB input, enabling easy connection to various devices, such as flash drives or smartphones. Additionally, it incorporates a 3.5 mm auxiliary input for added flexibility, allowing users to connect external devices with ease. The receiver supports playback of various audio formats, including MP3, WMA, and AAC, providing users with a vast library of music to choose from.

The CDA-7998 also features Bluetooth technology, which allows for hands-free calling and wireless audio streaming. This is particularly beneficial for maintaining focus on the road while enjoying a seamless connection to mobile devices. The built-in microphone ensures clear communication during calls, while the audio streaming feature allows users to enjoy their playlist without the hassle of cables.

Customization is a key aspect of the CDA-7998. The receiver includes a 3-band parametric equalizer, enabling users to adjust bass, midrange, and treble frequencies according to their preferences. Additionally, with its customizable color display and button illumination, users can personalize the aesthetic of their car’s interior, enhancing the overall experience.

Furthermore, the CDA-7998 supports additional amplification with its dedicated line outputs for front, rear, and subwoofer channels. This allows for a multi-channel audio setup, delivering an immersive sound experience that can satisfy even the most discerning listeners.

Overall, the Alpine CDA-7998 is a sophisticated car audio receiver that combines advanced technology with unparalleled sound quality and customization options, making it an ideal choice for anyone looking to elevate their in-car audio experience.

Basic Operation