In reply to:
Dolby Digital has 5, 6 (or 7, guys?) different full range channels, with a dedicated low frequency channel. DTS has the same; it just uses a different method of encoding.
Sort of.
Dolby Digital has 5 channels and a low frequency pseudo-channel. Dolby Digital EX has a matrixed sixth channel, but it isn't a real, discrete channel. Basically, the receiver interpolates what belongs in the rear speaker from the surround channel data. DTS is also five channels. DTS ES is a matrixed sixth channel like Dolby Digital EX. DTS ES Discrete is a true 6.1 signal with a real sixth channel of discrete data encoded in the bitstream. There really isn't a true 7.1 format out there yet, but THX Ultra post processing can interpolate two rear channels from the surround and rear channels.
