Subwoofer for my definitive tech setup

[halfgeek]

Hi fellow audophiles, need some suggestions on my setup in a townhouse with living and dining rooms together 25 x 21.

I bought a Yamaha RX-V677 7.2-Channel Receiver + Definitive Technology ProCinema 600 5.1 Speakers for $600 without subwoofer from Newegg couple of weeks back. I only use it with my HTPC running Windows 8 Pro, Biostar Motherboard (TZ77XE3) with a GIGABYTE GV-R645-1GI Radeon HD 6450, i5-3570K, 16GB RAM, 128GB SSD, 6 TB data. Connected using HDMI ( video card )from HTPC to Receiver.

The sound quality is not satisfactory. Is it because of missing subwoofer or definitive speakers or no audio card. Ready to invest to upgrade.

1) Please advise on subwoofer - thinking about getting SVS SB 2000 or 1000 from their outlet or BIC.
2) Can any generic wall mounts work for definitive speakers
3) Are there any recommended changes to be done on HTPC.
5) Shall i get bookself type front speakers and make it 7.1

 

[WhiteNoise]

BIC is a good cheap sub. I've demoed them and they were not for me but if trying to save money then go for it. There are plenty of good subs out there but I'm partial to Hsu Research and Velodyne.

If you want a sub then monitor or book shelf speakers make sense. If you don't want a sub then get floor standing speakers. Your receiver will do all the work so your HTPC is fine. You just want coaxial or toslink out to receiver.