On sub distance- It is actually setting a relative time delay on the rest of your speakers to account for the subwoofer latency. Think of the subwoofer distance as a time weighting and not literal distance.

So, at 10ft added it is adding about 9ms advancement to your subwoofer (relative to the mains.)


1134ft/s / 1000ms/s= 1.134ft/ms


So 10’ = 8.818ms advancement relative to mains