hi, i notice when people post to choose between fi's Q and fi's BL people always say the Q for sound quality..but for those that have heard both how is the BL'S sound quality compared to a w7? i listen to everything from rap to rock like korn,disturbed,etc..etc..so i dont want to just sound sloppy and muddy but after owning 4 w7's im sure the Q wont satisfy my need for bass..so if i can get some helpful words on how good or bad the sound quality is on the BL line up i would appreciate it..thank you