Not sure but I could have swore that the Audioholics site had different numbers Peter.

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DD compresses a 5.1 channel surround track to 384 kbps to 448 kbps (DVD Standard limited, DD has the potential of up to 640 kbps) while DTS uses much higher bit rates up to 1.4 Mbps for CD's / LD's and 1.5 Mbps for DVD
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Do bit-rates == encoding or are we talking about different measures?