My friend has the TSW125DVC's and they do sound very good IMO. He has them powered by a Lanzar Vibe 258 bridged at 4 ohms giving each about 500 watts. The amp is overrated somewhat but the subs themselves are great. His are in a 4.5 Cu Ft box tuned to 32hz which I made myself (see gallery for pics) and they have decent sound quality I think. And they do get pretty loud, we havent gotten them metered yet but they should be around the 140 area I would think.