chess:

In my earlier response about the Onkyo's power handling I failed to mention that it was not an issue. I used to have the Onkyo Integra DTR 5.1 which handled marvelously. I passed it over to my good brother couple of months ago. I enjoyed it for a couple of years and it spanked out great sound. I only upgraded so that I could setup a 7.1 HT.

theaterdoc:
In respect to THX.. Semi_On had a good explanations in an earlier thread months ago about THX and other stuff like DTS, DD and SACD.....

http://www.quadloft.com/hometheater- new HT