Thanks for the input. I'm still experimenting to see what sounds best or if I can tell a difference. I've had the M80s on 24" stands for awhile which placed the tweeters at roughly the same level as the 150. Since I started this chain, I've put them back on the ground and haven't noticed a difference so far. Just this morning I placed the 500 on a 24" stand to see if it makes a difference. No conclusions yet.