I currently have the Yamaha YST-SW300 subwoofer. It is acceptable but I am looking to upgrade and feel that it is the weakest link in my setup. The Yammy is a 12" side firing active seveo subwoofer with a 185w built-in amp at 5 ohms. Frequency range is supposed to be 18hz-170hz (-10db) The bass is good but, I think it can be improved. It can get quite muddy and boomy at times. I have been seriously looking at the HSU VTF-2. It's a 10" down firing with a 150 watt amp. Frequency reponse is 25hz-100hz at maximun extension mode. Would the VTF-2 be more of a lateral move or a significant improvement? I would use the subwoofer for 90% HT & 10% Music. Any comments would be appreciated.