are there any songs or cd's on the internet that have frequency tests and play really really low frequencys like from 20-40. I just built my box for my awt15x and it was supposed to be 4.6 cubes tuned to ~28. but the dimensions got built wrong and it turned out to be 5.5 cubes and tuned to 25.8!! i wanna see how low this thing can go. Any links to cd's or bass test songs.

ps- the ones on kazaa **** so please do talk about those.... Thanks alot.