What is Pro Logic 2?

No sweat. We are so into Audio on this forum , sonmetimes we forget we watch TV !

Darryl - I stand corrected...I was thinking only of DVD. Good point.

Pro Logic rear left and right channels are in MONO and the frequency responce is limited to only 8kHz. While Pro Logic II the rear channels are in stereo (for lack of a better word) and are also full range (to 20kHz). Sounds better to me.

I respectfully disagree thats it not worth the upgrade. Its great with Digital Cable, Satellite...etc. HBO sounds fantastic, Sports sound better ....overall quality of sound is greatly improved in my experience.

Like Pro Logic, PLII derives the center and rear channel information from the front L and R channels. DD5.1, which has five discrete channels plus a subwoofer channel, should give better results if a disc is 5.1 encoded. However, PLII is an improvement over Pro Logic for older, "Dolby Surround" encoded soundtracks.

Unless you have a large collection of laserdiscs of VHS tapes, PLII isn't reason enough to consider an upgrade, IMHO.