Thank you a lot for all your information. To tell you the truth, I do know ksw12 is not the sub for an audiophile,while the rsw series are.Velodyne is just a dream in my life( The price is too much for me,and I haven't seen any of them in my country,only on books).Right now I have 2 sets of stereos, one for music(amp is onkyo,loudspeakers are Rogers from the UK), the other is for home theater. The av amp is a sony and main speakers are Dali 104 from Denmark.(double 6.5" bass).I once considered DAli's sub swa12(www.dali.dk). But its a sealed sub. which I am afraid it is more suitable for music instead of home theater. To me, the ideal sub should be durable and the price can't be too high(at most 500 us dollars), and it should be "fast" enough.Is the ksw 12 the one I am lookink for? By the way, is it made in USA? Why can't I see the logo MADE IN USA? or is it assembled in Mexico? Still waiting for your anwsers. Thanks a lot.