Distant from front wall

I cannot speak for anyone but myself: I always measure from the wall to the sound source which is, generally, the front panel.

Kal

I am under the impression that the best place to measure from is the center of the woofer. If your speakers are time aligned the tweeter will probably be very close to that.

The front wall, although I do think speaker depth could be an issue if your speakers are box speakers that happen to be rear ported. For example, I had to put my WATT/Puppies further out into the room than my previous speakers (Tyler Acoustics) because the Tylers were front ported, and the Puppies are rear ported, and significantly deeper.

Distance is measured from the front wall to the front of the speaker baffle.
Distance From the side wall is measured from the wall to the center of the woofer in the front baffle.

Russ