Manual Alpine PXA-H701 (page 10 of 52) (English)

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8-EN

Performing time correction manually

(TCR)/Switching the phase

Because of the particular conditions inside the

vehicle, there are major differences in the

distances between the different speakers and the

listening position. The proper time correction can

be obtained using the automatic time correction

function (“AUTO TCR”), but it is also possible to

calculate the optimum correction values and

eliminate the time error at the listening position

yourself using this function. You can also use this

function to switch the phase.

When operating with head units such as the IVA-

D300 series, the adjustment is different

depending on the head unit.

1 Check that the defeat mode is off.

(See page 28.)

2 Sit in the listening position (the driver’s seat, for

example) and measure the distance (in meters)

between your head and the various speakers.

3 Calculate the difference in distance between the

farthest speaker and the other speakers.

L = (distance of farthest speaker)

– (distance of other speakers)

4 Divide the distances calculated for the different

speakers by the speed of sound (343 m/s

temperature 20°C).

This value is the time correction value for the

different speakers.

2.25m

0.5m

5.1ms

• Concrete examples

1.Calculating the time correction value for the

front left speaker on the diagram below.

Conditions:

Distance between farthest speaker and

listening position: 2.25 m (88-3/4")

Distance between front left speaker and

listening position: 0.5 m (20")

Calculation: L = 2.25 m (88-3/4") – 0.5 m (20")

= 1.75 m (68-3/4")

Compensation time = 1.75 ÷ 343 x 1000

= 5.1 (ms)

In other words, setting the time correction value

for the front left speaker to 5.1 (ms) sets a

virtual distance matching the distance to the

farthest speaker.

The sound is uneven

because the distance

between the listening

position and the different

speakers is different.

The difference in the

distance between the

front left and rear right

speakers is 1.75 meters

(68-3/4").

Time correction eliminates

the difference between

the time required for the

sound from the different

speakers to reach the

listening position.

Setting the time correction

of the front left speaker to

5.1 ms makes it possible

to coordinate the distance

from the listening position

to the speaker.

5 Press the TCR/PHASE button to set the time

correction mode.

Settings/Adjustments

CHANNEL

ENTER

TCR/PHASE

Rotary encoder

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Alpine PXA-H701 Manual

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