Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's Technics!

SBAS500 powered sub-woofer is another reason why I have respect for the "Technics" brand. It is simple to install, understand, and yet delivers the quality tight bass. The low frequency is handled and delivered well by the in-built 100W amplifier. It works well with any existing home theater system or even component music systems. I am using the S500 with my "Marantz" digital AV sound processor, and since I have added this sub-woofer, the sound quality has increases dramatically. Some of you may find it a little less responsive sometimes, but then you should realize that this is not a super-sub. Try looking for JBL, and RCA for that sound effects (but they come at a price). At $220, it's not overpriced at all, with its outstanding quality and sound, it will satisfy most of you.