Setting Speaker Delay Settings Using Sis Commands; Two Person Setup - Extron electronics SSP 7.1 User Manual

Setting Speaker Delay settings using SIS commands

N It is strongly recommended that, for ease and simplicity, these adjustments are
To adjust Compensation Delays using SIS commands, follow these instructions:

Two person setup

N Setting up speaker delays is easier with two people. If only one person is
1. Pick an ideal central location where all speaker output signals converge.
2. Use a tape measure to measure the distance from each speaker to the
convergence location. Be sure to measure to the same spot from each speaker.
N Measurements from the speaker should be to the midrange driver in a three-way
3. When the distances to every speaker have been measured accurately, select the
speaker that is farthest from the convergence location and use that distance as a
reference value.
4. Calculate the delay distance for each speaker, where:
Delay Distance = Farthest Speaker Distance - Individual Speaker Distance
5. Calculate the delay time (in ms) for each speaker, where:
Delay Time = Delay Distance / Vs
N The constant Vs, the speed of sound, is 0.343 m/ms or 1.12533 ft/ms.
6. For SIS commands, the delay time must be converted to units of 0.1 ms:
SIS Delay time = Delay Time (per ms) x 10
7. Compile the information into a table (if possible, use a spreadsheet program to
carry out the calculations automatically). An example is given below:
Speaker
Channel
Left
Right
Center
Left Side
Right Side
Left Back
Right Back
8. Use these SIS Delay Time values when entering SIS commands to compensate
for speaker delay where there are no Lip Sync effects (see Speaker Delay Settings
on page 6-9).
made with the SSP 7.1 Setup and Control Software (see page 5.9). If that is not
possible, the delay values can be calculated and entered, using SIS commands.
available, the position of the listener's ears must be marked precisely using, for
example, a pile of boxes. Do not try to guess ear positions, as this will introduce
measurement errors.
speaker or from halfway between the tweeter and the woofer in a two-way
speaker. Measurements to the convergence location should be at ear height.
Measured Distance
(ft)
12.00 (farthest speaker)
11.00
10.50
8.25
7.50
6.13
7.50
SSP 7.1 • Configuration and Control
Delay Delay Time
(ft) (ms)
0.00 0.0
1.00 0.9
1.50 1.3
3.75 3.3
4.50 4.0
5.87 5.2
4.50 4.0
SIS Delay
Time
0
9
13
33
40
52
40
6-15 6-15