Alpine CDA-7897 - Manual (Page 10)

8
-EN
About the Crossover
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
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
Low range
speaker
Mid range
speaker
High range
speaker*
20 Hz -
200 Hz
20 Hz -
20 kHz
----
----
FLAT, 6,
12, 18,
24 dB/oct
6, 12, 18,
24 dB/oct
FLAT, 6,
12, 18,
24 dB/oct
FLAT, 6,
12, 18,
24 dB/oct
----
0 to
− 12 dB
0 to
−12 dB
0 to
−12 dB
20 Hz -
200 Hz
----
----
----
FLAT, 6,
12, 18,
24 dB/oct
FLAT, 6,
12, 18,
24 dB/oct
FLAT, 6,
12, 18,
24 dB/oct
----
----
0 to
−12 dB
0 to
−12 dB
0 to
−12 dB
Low range
speaker
Front high
range
speaker
Rear high
range
speaker
----
20 Hz -
200 Hz
20 Hz -
200 Hz
Cut-off frequency
(1/3 octave steps)
Slope
Level
HPF LPF HPF LPF
----
20 Hz -
200 Hz
1 kHz -
20 kHz
ww frequency
(1/3 octave steps)
Slope
Level
HPF LPF HPF LPF
∗ When setting the high range HPF filter to FLAT, do not turn up the
volume too much. This may damage the speaker.
Output frequency range
Slope FLAT
LPF cut-off
frequency HPF cut-off
frequency
Level adjusting
(0 to - 12 dB)
Slope adjusting
20 Hz
Low range High range Low range High range Mid range
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.
Basic Operation
(Different from actual display) (Different from actual display)
(Different from actual display)