To add to what @thumb5 said:
1) the delay is always added to the closer speaker. Your sub is further away than your speaker so in your case the delay is added to your speaker to stop the sound from it arriving before the sound from the sub. In @chrisc's case his sub is in front of his speakers so the sound from it arrives first. Normally that would mean that you would add a delay to the sub but he said he could detect no difference in arrival times. That could be because of the electronic delay the sub adds (see my point 3 below). because of the fact that the sound from the speaker had to bend around the sub (see point 2 below), or a combination of both.
2)you need to actually measure the difference in distance from your ears to the speakers and to the sub. The difference in distance is then calculated by subtracting speaker distance from sub distance since the sub is the most distant speaker. The result you get will be different from 2 metres. If you can't see the sub from your listening position because the sub is hidden by the right speaker then the distance may be a little longer because the sound can't travel in a straight line from sub to you and will have to diffract (bend) around the speaker. If you need to specify a time delay in the configurator then a rough guide to the calculation is 1 ms per foot distance. If you need to be more accurate than that then there's lots of online calculators for doing a more precise calculation.
3) the electronics in a sub (the amp, the phase control, and so on) actually delay the sound from the amp reaching the driver. That kind of circuitry isn't present in the signal parts from amp to speaker. It makes a small difference and, from what I've read on an AV forum about the Audyssey room correction system (I have a separate HT setup in a different room which uses Audyssey) it seems that the extra delay added by the sub's electronics is usually around 3 ms so you may need to add 3ms to the time delay you calculate or 3' to the distance as a starting estimate and to perhaps decrease that by 1 ms or feet depending on how you enter the figure, or increase it by 1 to 2 ms/ft in order to get it correct.
As @thumb5 said, there is no "on paper" way of calculating the correct delay. You need a combination of physical measurements and a bit of adjustment to compensate for differences in the travel path of the sound if it can't get to you without bending around a speaker and also for the fact that the circuitry in most subs imposes an additional small delay of its own.
1) the delay is always added to the closer speaker. Your sub is further away than your speaker so in your case the delay is added to your speaker to stop the sound from it arriving before the sound from the sub. In @chrisc's case his sub is in front of his speakers so the sound from it arrives first. Normally that would mean that you would add a delay to the sub but he said he could detect no difference in arrival times. That could be because of the electronic delay the sub adds (see my point 3 below). because of the fact that the sound from the speaker had to bend around the sub (see point 2 below), or a combination of both.
2)you need to actually measure the difference in distance from your ears to the speakers and to the sub. The difference in distance is then calculated by subtracting speaker distance from sub distance since the sub is the most distant speaker. The result you get will be different from 2 metres. If you can't see the sub from your listening position because the sub is hidden by the right speaker then the distance may be a little longer because the sound can't travel in a straight line from sub to you and will have to diffract (bend) around the speaker. If you need to specify a time delay in the configurator then a rough guide to the calculation is 1 ms per foot distance. If you need to be more accurate than that then there's lots of online calculators for doing a more precise calculation.
3) the electronics in a sub (the amp, the phase control, and so on) actually delay the sound from the amp reaching the driver. That kind of circuitry isn't present in the signal parts from amp to speaker. It makes a small difference and, from what I've read on an AV forum about the Audyssey room correction system (I have a separate HT setup in a different room which uses Audyssey) it seems that the extra delay added by the sub's electronics is usually around 3 ms so you may need to add 3ms to the time delay you calculate or 3' to the distance as a starting estimate and to perhaps decrease that by 1 ms or feet depending on how you enter the figure, or increase it by 1 to 2 ms/ft in order to get it correct.
As @thumb5 said, there is no "on paper" way of calculating the correct delay. You need a combination of physical measurements and a bit of adjustment to compensate for differences in the travel path of the sound if it can't get to you without bending around a speaker and also for the fact that the circuitry in most subs imposes an additional small delay of its own.
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