How necessary is a subwoofer? in Home Theater Posted February 13, 2014 If the KLF 30's are in decent shape, get 'em! I love mine and they dig pretty deep on the bass. (I use KLF 10's as rear speakers). IMO a better center (especially a KLF C7) would make the biggest impact on your HT. I picked up my 10's and C7 well before I added a sub and the difference was huge in terms of sound quality. I happily got rid of my old Synergy surrounds and center. Didn't realize what a sonic mismatch I'd been experiencing. I added the 12" Klipsch reference sub later and crossed it over at 40 hz. It's great, but I'm glad I got the basics right first. Good luck, welcome and Go Cards!!