Well, they do say that they hold up to 40 lbs each... and the M80s weigh 57 lbs. However, I don't know if you can sum that, and I don't know that I would trust it. I mean, the distance out from the wall alone would be a massive strain. The M80s are 15 inches deep, and not a bit of that would be supported. Well, maybe 1 or 2 inches. It'd scare the crap outta me.
I also kind of have to question the intent of the original poster in setting them up horizontally. I mean, the M80s are 40 inches tall (wide) and the VP150 is 29.5 inches wide. If you put them close enough together that they are touching, that's 110 inches! What kind of screen have you got that will cover all that? In addition, if they are touching, that's sort of creating one big huge mega wide speaker. You're not going to get very good separation out of that, and the imaging will be all funkay.
Anyway, that's my $1.95.
