I'm currently deciding between a Tivo 4 and and a Tivo XL4. I was looking at the specifications page on the tivo website, and it says under THX®sound and video certification:
Premiere 4: Not THX® Certified
Premiere XL4: THX® Certified, Dolby 5.1
The way it looks on the actual chart is ambiguous. Does that mean that the XL4 is the only tivo that can output 5.1 surround sound? If so that's very surprising to me.
Also, as far as THX certification goes, has anyone directly compared the sound/picture quality of the XL4 vs. the regular 4? My guess is that the XL4 and 4 probably share the same hardware/software (other than hard drive) but that the XL4 is the only one to go through testing. Probably nobody outside of tivo knows for sure, but maybe some people have done a head to head comparison? if so, can you tell the difference?
P.S. I was a directivo user back in the day....finally had enough with my crappy comcast DVR. It feels good to know that i'll be "coming home."