i love people who post something without reason. straight one word answers, then answers back by saying its cuz its "swedish quality." please....give a valid reason.
anyways i'm not a firm believer than amps have "sq." actually i do but to me the differences are negligible due to the POS environment we call a car. as long as you are not buying POS amps such as pyle, ma, audiobahn, etc.. then it probably won't make too much of a difference, especially since you are asking if they are "sq" differences. there are other things to consider such as build quality, power requirements, amp size, current draw, aesthetics, configuration of the terminals of the amp and customer service all take part when considering an amp. so buy the one that has the best combo of the above, then thats your amp.
remember steven head and gary biggs win world championships with jbl amps and they're not even close to being expensive so remember that //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif. install install is key.