I have a Rythmik sub and so far its has been sitting on the floor spiked with moderate results. I have done measurements using REW and there were a couple of suck outs and FR was not even. After reading this thread I decided to try it out so with the help of some stack of books I raised the sub 12" off the floor. Did my measurements again and was surprised to find that all the suck outs were gone and now the FR was pretty much flat. Adjusted the phase, xover and gain and I am enjoying a sub that is very well integrated with my monitor speakers. Its worth trying it out.
Elevating subwoofer about two feet off the floor
Acoustic Sciences Corp recommends elevating the subwoofer about 2' off the floor http://www.acousticsciences.com/products/subtrap
see photo in link above ... has anyone tried raising their subs that high off the floor? Did it sound better?
see photo in link above ... has anyone tried raising their subs that high off the floor? Did it sound better?