1. Set the delay of the farthest speaker from the desired listening position tozero.
2. Measure, in inches, and record the distance from the desired listening
position to the farthest speaker. This is your baseline measurement.
3. Measure, in inches, and record the distance from the listening position to
each of the remaining speakers. Each speaker should correspond to a
channel of the output from the head unit
4. Subtract the distance of the baseline speaker from each of the other
speakers (for a given channel of the head unit) and record that value (these
will all be negative values).
5. Divide each of these differences by 13.52 (value at 68°F) to set the required
delay settings in msec for each of the remaining speakers. The exact
speaker path length differences will appear for each channel as you enter
the msec delay value.
NOTE: The value of 13.52 varies with temperature, a chart is given at the
end of this discussion listing values to be used with different
temperatures. The error in the this value is at the most 5% between
temperatures of 50°F to 100°F.
For example: The baseline speaker (farthest away) measures 60 inches. The LT
(left tweeter) measures 20 inches. The difference is 20-60=-40 inches. The delay
time correction is -40/13.52 which equals a delay setting of -2.96 mS (a setting of
2.96 will be entered into the head unit channel for the LT speaker.
Temperature Correction Factor
50°F 13.29
60°F 13.42
70°F 13.55
80°F 13.67
90°F 13.80
100°F 13.92
110°F 14.05
Note different speaker crossover settings will also affect time correction. You'll need to listen to a music disk where the singer is dead center and retune till the vocals are dead center. Dont be afraid to use EQ with minor 1 or 2 db boosts or a lot of cuts to achieve a better sound stage and detail, just leave the bass frequencies alone. Your setup should sound amazing once you get those hertz in all tuned up along with your doors deadened.
