Alpine CDA-7878R - Manual (Page 32)

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Adjusting the Sound Operation
The Crossover/Time Correction
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 divider 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
----
20 Hz -
200 Hz
20 Hz -
200 Hz
Low range
speaker
Front high
range
speaker
Rear high
range
speaker
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
Cut-off frequency
(1/3 octave steps)
Slope
Level
HPF LPF HPF LPF
3 way mode
----
20 Hz -
200 Hz
20 Hz -
20 kHz
Low range
speaker
Mid range
speaker
High
range
speaker*
20 Hz -
200 Hz
20 Hz -
20 kHz
----
----
FLAT, 6,
12, 18,
24 dB/
oct
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
Cut-off frequency
(1/3 octave steps)
Slope
Level
HPF LPF HPF LPF
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.
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.
(Different from actual display) (Different from actual display)
Output frequency range
Slope FLAT
HPF cut-off
frequency LPF cut-off
frequency
Level adjusting
(0 to - 12 dB)
Slope adjusting
20 Hz (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 High range Low range High range Mid range