Im on the market for 2 x sealed subwoofers and despite lots of reading and utilizing Google I have been unable to find out which out of the two subs has the most useable output 20hz and below. ( manufacturer's specs aside). The Rythmik states 14hz (+/- 2db) and the SVS 20hz (+/-3db) but of course in the real world that may not be the case. I use for both music and movies 50%. Does anyone have links that show what these subs perform like? Thoughts?