"Have you tried setting all speakers to small, and setting the crossover at 80hz? "

Yes Randy, that's how i have been running them.... but after all the discussion on crossover frequency, I'd like to run them large so I can crossover my VP-100 and QS-8s at 100 HZ. (just tinkering )

BUT I don't want to do this if it may damage the M 60's.

Also a good idea to try cinder blocks first......

HT PICS