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The PXA-H701 is equipped with an active
crossover allowing the frequency bands to be
split before amplification. Because of this, there
is no need for a passive network between the
speakers and amplifiers. This makes the
amplifiers fully independent, eliminating the
problem of interference. This also makes it
possible to achieve the optimum acoustic space
by dividing the playback frequencies in a way
suited to the speaker’s response.
This adjustment requires sufficient knowledge
and experience. If you have problems, we
suggest you have the adjustment made by your
store authorized of Alpine dealer.
Adjust the high pass filter (H.P.F.) and low pass
filter (L.P.F.) and set the slope (filter response
attenuation slope) for the different bands.
Make the adjustments according to the playable
frequency ranges and frequency responses of
the connected speakers.
Cutoff frequency
adjustment range
(1/6 octave steps)
Slope adjustment
H.P.F. L.P.F. H.P.F. L.P.F.
Front 1
(Front speaker 1)
Select TWEETER
6/12/18/
24/30dB
6/12/18/
24/30dB/
Filter OFF
1kHz –
18kHz
1.1kHz –
20kHz
Front 1
(Front speaker 1)
Select FULL RANGE
6/12/18/
24/30dB/
Filter OFF
6/12/18/
24/30dB/
Filter OFF
20Hz –
18kHz
22Hz –
20kHz
Front 2
(Front speaker 2)
6/12/18/
24/30dB/
Filter OFF
6/12/18/
24/30dB/
Filter OFF
20Hz –
18kHz
22Hz –
20kHz
Rear
(Rear speaker)
6/12/18/
24/30dB/
Filter OFF
6/12/18/
24/30dB/
Filter OFF
20Hz –
18kHz
22Hz –
20kHz
Center*
(Center speaker)
6/12/18/
24/30dB/
Filter OFF
6/12/18/
24/30dB/
Filter OFF
20Hz –
18kHz
22Hz –
20kHz
Sub. W
(Subwoofer)
6/12/18/
24/30dB/
Filter OFF
6/12/18/
24/30dB
20Hz –
180Hz
22Hz –
200Hz
20Hz 10kHz
The H.P.F. setting cannot be the same as or
exceed the L.P.F. setting for that channel.
• The crossover network is a filter that divides
specific frequency bands.
• The high pass filter is a filter that cuts
frequencies below a certain frequency (bass
frequencies) and lets through treble
frequencies.
• The low pass filter is a filter that cuts
frequencies above a certain frequency
(treble frequencies) and lets through bass
frequencies.
• The slope is a value expressing the
attenuation of the signal in decibels when the
frequency is increased or decreased by one
octave.
• The higher the slope value, the steeper the
slope.
• If the slope is set to “OFF”, the signal does
not pass through the filter, so there is no
effect.
• In order to protect the speakers, if Tweeter is
selected in Front 1, there is no filter OFF
(slope OFF) setting for H.P.F.
For the same reason, the subwoofer low
pass filter cannot be turned off (the slope
cannot be set to “OFF”.)
• Tweeters may be damaged if low frequency
signals are input to them.
Signals with these frequencies output
Slope adjustment
Slope OFF
H.P.F. cutoff frequency L.P.F. cutoff frequency
* If center is set as subwoofer, the adjustment
range changes to the range of subwoofer.