How to set delay?
1. The optimum listening level is when u sit in the middle and all speakers placed at equal distance. That means, assume, your center and front are at 5 ft distance then you rear should be 5 ft away from you. This way you get a balanced side.
Delay is set when this equal placement is not there.
1 ms delay = 1 ft distance
Example - for delay:
Assume you center and fronts are at 5 feet, but you rear is at 2 ft behind you. Now you need to set a delay of 3 ms in your rear speaker. What it means is, your rear speaker will give the sound with a delay of 3 ms which is equivalent of 3 feet.
This will ensure you hear the sound from fronts and rear at the same time. if you didnt set the delay, then you will hear the rear sound before you hear the front!
example for volume level:
By default, volume level should be 0 for all. One can increase the volume for spatial alignment. For example, from you sitting position, the rear left and rear right should be at equal distance from your head. That is left rear is at 2 ft from your left ear, your right rear should also be at 2ft from your right ear.
If left say, left rear is at 2 ft and right rear is at 3 ft, then what you do is increase the volume of right rear by 1 or 2 so that it balances, else you will hear more sound from left rear as its closer.