A sound wave travels at approx. 340 meter/sec., which is equivalent to:

1 foot in 1 millisecond

or

1 meter in 3 milliseconds

 

Following example demonstrate how to calculate the delay setting for SL, SR, SC and C:

From the listening position to each speaker, we measure following distances:

 

Example

Your measurements

Listening position <-> Left speaker:

3.8 m (= 11.4 ft)

Listening position <-> Right speaker:

3.8 m (= 11.4 ft)

Listening position <-> Center speaker:

2.9 m (=

8.7 ft)

Listening position <-> Left surround speaker:

2.1 m (=

6.3 ft)

Listening position <-> Right surr. speaker:

2.1 m (=

6.3 ft)

Listening position <-> Center surr. speaker:

1.8 m (=

6.3 ft)

The delays when measuring the distance in meters are then calculated as:

SL delay :

(L - SL distance) x 3 =

(3.8

- 2.1) x 3 =

5.1ms

SR delay :

(R - SR distance) x 3 = (3.8

- 2.1) x 3 =

5.1ms

C delay :

(L - C distance) x 3 =

(3.8

- 2.9) x 3 =

2.7ms

SC delay :

(L - C distance) x 3 =

(3.8

- 1.8) x 3 =

6ms

or when the distance is measured in feet:

SL delay :

L - SL distance =

11.4

- 6.3 =

5.1ms

SR delay :

R - SR distance =

11.4

- 6.3 =

5.1ms

C delay :

L - C distance =

 

11.4

- 8.7 =

2.7ms

SC delay :

L - SC distance =

11.4

- 5.4 =

6ms

In this example, we would set the delay to:

 

 

SL 5.0ms

C 3.0ms

SR

5.0ms

SC

6.0ms

The above calculations for delay are based on the physical installation and should be stored as the initial settings in the memory banks (see section 5).

However, at Thule Audio’s experience the delay could be further increased about 0

–3 milliseconds in the surround speakers from the above calculations, to obtain a more realistic surround sound image.

For each surround mode the preferred settings should be stored in the memory banks for automatic reload.

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