Alpine PXA-H800 About the Crossover X-Over, Adjusting X-Over and Switching the Phases, 26-EN

From a PC

•After the setting, it is recommended to store the setting contents on the unit. For details, refer to “Storing the Preset Values (Preset Store)” (page 12).

Displaying the data

1 Click [Show All Data].

The setup values for all the channels will be displayed.

About the Crossover (X-Over)

Crossover (X-Over):

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).

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.

			Cutoff frequency adjustment range
					(1/6 octave steps)
				HPF			LPF
		20Hz to 18kHz					22Hz to 20kHz
Front High		1kHz to 18kHz					1.1kHz to 20kHz
		(Tweeter only)					(Tweeter only)
Front Mid		20Hz to 18kHz					22Hz to 20kHz
Front Low		20Hz to 18kHz					22Hz to 20kHz
Rear		20Hz to 18kHz					22Hz to 20kHz
Center		20Hz to 18kHz					22Hz to 20kHz
Subwoofer		20Hz to 180Hz					22Hz to 200Hz
Level adjustment
(0 to -12 dB)		Output frequency range
							Slope FLAT
							Slope adjustment
20 Hz						(Different from actual display)
	HPF cut-off			LPF cut-off
	frequency			frequency

•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 (0 dB/oct) 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.

•Adjustment should be made according to the recommended crossover frequency of the connected speakers. Determine the recommended crossover frequency of the speakers. Adjusting to a frequency range outside that recommended may cause damage to the speakers.

For the recommended crossover frequencies of Alpine speakers, refer to the respective Owner’s Manual. We are not responsible for damage or malfunction of speakers caused by using the crossover outside the recommended value.

Adjusting X-Over and Switching the Phases

This section describes how to adjust X-Over. Before working on this, refer to “About the Crossover (X-Over)” (page 26).

Hint for adjusting the subwoofer

If the subwoofer is installed on the rear deck, setting a gentle L.P.F. slope (for example 6 dB/ oct.) makes the sound localization more to the rear. This can also affect the acoustic localization of the front.

Hints for adjusting the high range

Depending on the speaker, inputting low frequency component signals (about 2 kHz or less) with the H.P.F. adjustment could result in distortion. If so, set a steep slope (for example

30 dB/oct.).

When doing so, adjust so that the mid and high range sounds do not separate.

Normally use with the L.P.F. off. If the high range is too strong, we recommend adjusting for a gentle slope.

Hint for adjusting the low range

When a subwoofer is connected and you are using a speaker with a low range of under 10 or 12 cm (3-15/16” or 4-3/4”), setting the low range H.P.F. to “OFF” can result in distortion when low frequency components are input.

If so, set the H.P.F. slope to a value suited for the speaker’s frequency response.

1 Click [X-Over] for [Shortcut] tab in the main menu.

The X-Over Setup screen is displayed.

•When you click [Mobile Sound Manager] on the Function switching tab, and then [X-Over], the X-Over Setup screen will also be displayed. Refer to “Operating the Function Switching Tab” (page 7).

2 Click either [ ] or [ ].

26-EN