Makes sense, just thought that since I was investing in a card for powering my Sennheiser's I'd try to improve the sound bar.
I might be investing in the full surround later on since where I work I get a accommodations through them so I get the equipment pretty cheap. Would it make a difference then?
Also what would be blu-ray quality sound? If I could get substantially better sound from a different system I would wanna look into it.
Most likely an HT setup of the same cost as the full Sonos Playbar, sub, and rear speaker setup would be better. I haven't heard the Playbar, but it's generally the case that you can easily improve upon soundbar setups. Even Endgadget came to that conclusion in their listening test:
For instance, for the price of their sub at $699, most likely the HSU Research VTF-3 MK4 or SVS PB12-NSD would slay it in overall performance. If you are getting a good discount, perhaps you are getting a good value.
Dolby Digital, which is the common encoding for DVD 5.l, is compressed, lossy audio. Fairly high bit rate, but still not lossless. Dolby TrueHD and DTS-HD MA in Blu-ray are lossless and are supposed to give you an exact duplicate of the studio master. So you do hear a difference with a good audio system between a good quality movie recording on DVD vs. one on Blu-ray.