Klipsch Sub Upgrade Advice, please

[Grey Goose]

I currently own an R-112SW from Klipsch. I have the opportunity to upgrade the sub from the 12 inch version to the 15 inch version for the difference between what I paid for the 12" and the price for the 15". Neither is full retail. My question to the community, is there a better sub for under 750 that will perform better? Why?

My current sub is integrated into a 5.1 home theater system used for a balance of movies and music. The speakers are B&W 600 Series 2 speakers. The receiver is a Pioneer Elite VSX-90. The room is about 17L x 12W with the speakers setup along the length of the room. The sub is in the corner next to my front speakers. The new sub will go in the same spot. The room does limit placement.

I am also looking at the svs sub isolation feet. Are they worth it?

 

[everettT]

At $750 maybe not, but for $50 additional the lvx12 from rythmik, for the same $50 the HSU vtf3 mk5, and a $150 the vtf15 from HSU should be better in deep extension and above 30hz probably all within a few dbs, with the two Hsu units winning out.

 

[tyhjaarpa]

At $750 maybe not, but for $50 additional the lvx12 from rythmik, for the same $50 the HSU vtf3 mk5, and a $150 the vtf15 from HSU should be better in deep extension and above 30hz probably all within a few dbs, with the two Hsu units winning out.

And it would be worth to pay that 50$/150$ extra if you ask from me.