Hi, I'm new to this forum. 10 years ago I got my first 5.1 setup with all Cerwin Vega speakers. The sub has always been terrible. I upgraded the front and center channels to Polk's and they are decent. I'm looking at the Hsu VTF-2 MK4 or the Lava LSP12. The difference ib price is $250 but I don't mind spending the difference if it's worth it. Also, I'll need a 25 ft sub interconnect.Thanks for any recommendations you may have.