I have been doing research for the past couple of months and decided on the HSU Vtf-15H for my sub upgrade. I am also expecting my Denon X4000 to be here this week and need some advice. I'm debating about whether I should run the Infinity SW-12 with the Vtf-15h or would it not do me any benefit at all? I did the crawl today to find the best spots for my sub and have found 2 spots where I think I could put each sub so long as they would be "compatiable". The Vtf-15h would be behind my MLP and the SW-12 would be in the front right of my MLP by the fireplace. The sw12 would be wired and the VTF-15h would be wireless if that matters. From my reading, the denon x4000 has sub-eq which would eq both subs separately so i'm thinking maybe it would be better to run both instead of just the Vtf-15h. From reading the forums, i have read mixed reviews, some say never to mismatch a "better" sub with a "lower" sub and some say it sounded better and fuller? What are your thoughts? Thanks for your help in advance! Paul