Manual Alpine X701D (page 36 of 103) (English)

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36-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, please

consult your authorized Alpine dealer.

• 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.

• 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.

About Time Correction

The distance between the listener and the speakers in a car vary widely

due to the complex speaker placement. This difference in the distances

from the speakers to the listener creates a shift in the sounds image and

frequency characteristics. This is caused by the time delay between the

sound reaching the listener’s right versus the left ear.

To correct this, this unit is able to delay the audio signal to the speakers

closest to the listener. This effectively creates a perception of increased

distance for those speakers. The listener can be placed at an equal

distance between the left and right speakers for optimum staging.

The adjustment will be made for each speaker in 3.4 cm steps.

Adjust the time correction level of the front left speaker to a high value

and the rear right to zero or a low value.

The sound is not balanced because the distance between the listening

position and the various speakers is different.

The difference in distance between the front left speaker and the rear right

speaker is 1.75 m (68-7/8").

Here we calculate the time correction value for the front left speaker in the

diagram on the above.

Conditions:

Farthest Speaker – listening position : 2.25 m (88-9/16")

Front left speaker – listening position : 0.5 m (19-11/16")

Calculation: L = 2.25 m – 0.5 m = 1.75 m (68-7/8")

Time correction = 1.75 ÷ 343* × 1,000 = 5.1 (ms)

* Speed of sound: 343 m/s (765 mph) at 20°C

In other words, giving the front left speaker a time correction value of 5.1

ms makes it seem as if its distance from the listener is the same as the

distance to the farthest speaker.

Time correction eliminates the differences in the time required for the

sound to reach the listening position.

The time of the front left speaker is corrected by 5.1 ms so that its sound

reaches the listening position at the same time as the sound of other

speakers.

Cut-off frequency

(1/3 octave steps)

Slope

Level

HPF LPF HPF LPF

Subwoofer

(LPF)

----

20 Hz -

200 Hz

----

FLAT, –6,

–12, –18,

–24 dB/oct.

0 to

–12 dB

Rear

speaker

(HPF)

20 Hz -

200 Hz

----

FLAT, –6,

–12, –18,

–24 dB/oct.

----

0 to

–12 dB

Front

speaker

(HPF)

20 Hz -

200 Hz

----

FLAT, –6,

–12, –18,

–24 dB/oct.

----

0 to

–12 dB

Level

adjusting

(0 to –12 dB)

Output frequency

range

Output frequency range

Slope adjusting

20 Hz

(Different from actual

display)

LPF cut-off

frequency

HPF cut-off

frequency

Low range High range

Slope

FLAT

Subwoofer Rear speaker

Front speaker

200 Hz

Example 1. Listening Position: Front Left Seat

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Others manual(s) of Alpine X701D

Alpine X701D Additional guide - English - 84 pages

Alpine X701D Quick start guide - English - 188 pages

Alpine X701D Additional guide - German - 90 pages

Alpine X701D User Manual - German - 103 pages

Alpine X701D Quick start guide - German, Dutch - 188 pages

Alpine X701D Additional guide - Dutch - 85 pages

Alpine X701D User Manual - Dutch - 103 pages

Alpine X701D Quick start guide - French, Italian, Polish, Swedish, Spanish - 188 pages

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Alpine X701D Manual

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