OK. 13' is not unreasonable.

I'm about 10' (M22s in a medium size room) to 11' (M2s in a large room) from my speakers & listen up to about 90 DBs without any problems - mind you both of these systems have 2 subs each.

My M3s (used as ambiance speakers) are in opposite corners 25' apart but they never protest either even at higher levels.

I'm out of ideas. Anyone??

TAM