Alpine CDA-105 - Manual (Page 35)

33
-EN
About the Crossover
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,
consult your authorized Alpine dealer.
4.2ch (FRONT/REAR/SUBW.) mode
2.2ch (3WAY) mode
* Only when selecting USER’S in “Setting the Response Slope for the
High Range Speaker (TW SETUP)” (page 28).
• 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.
• 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.
Cut-off frequency
(1/3 octave steps)
Slope
Level
HPF LPF HPF LPF
Low range
speaker
----
20 Hz -
200 Hz
----
FLAT, 6,
12, 18,
24 dB/oct.
0 to
-12 dB
Rear high
range
speaker
20 Hz -
200 Hz
----
FLAT, 6,
12, 18,
24 dB/oct.
----
0 to
-12 dB
Front high
range
speaker
20 Hz -
200 Hz
----
FLAT, 6,
12, 18,
24 dB/oct.
----
0 to
-12 dB
Cut-off frequency
(1/3 octave steps)
Slope
Level
HPF LPF HPF LPF
Low
range
speaker
----
20 Hz -
200 Hz
----
FLAT, 6,
12, 18,
24 dB/oct.
0 to
-12 dB
Mid range
speaker 20 Hz -
200 Hz 20 Hz -
20 kHz
FLAT, 6,
12, 18,
24 dB/oct.
FLAT, 6,
12, 18,
24 dB/oct.
0 to
-12 dB
High
range
speaker
1 kHz -
20 kHz,
(20 Hz ~
20 kHz)*
----
FLAT*
6, 12, 18,
24 dB/oct.
----
0 to
-12 dB
Low range High range
(Different from actual display)
Low range Mid range High range
(Different from actual display)
Level adjusting
(0 to -12 dB)
Output frequency range
Slope FLAT
Slope adjusting
20 Hz
HPF cut-off
frequency LPF cut-off
frequency
(Different from actual display)