sure, SQ subs would be Sound Quality, which means it sounds really good, hits all the right notes and doesnt miss a frequency. SPL means Sound Preasure Level, which is pretty much how loud the sub gets, it ussually doesnt sound very good but is loud as hell!//content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif