SQ sound quality subwoofer made. This makes me laugh as I have competed since 1994 and if this is sound quality then im Santa Clause! I have had the 13W6 and the 13W7 and have to say that I have found many better subs for way less. I switched to the RE Audio XXX and am much happier and payed less than my W7. I feel JL is just living off the reputation they built as the subs have not changed in about 7 years. 500 to 1100 dollars for these subs is robbery but if you just have to have JL then have at it.