Originally Posted by Feirstein
DTS submitted a proposed system without speech normalization and with a different spec (louder) for the bass level in the sub channel.
Not sure what you mean by "speech normalization", but DialNorm is an overall volume offset intended to keep average dialogue levels roughly the same from program to program. Also, I have trouble believing that DTS would submit a spec that admitted to deliberately changing the bass level during encoding. Compression codecs attempt to stay as faithful to the original as possible, not re-mix the sound for louder bass.
Thus when playing back a DVD's or Blue Rays Dolby audio track, unless the receiver was/is properly calibrated for both systems (not always the case) the DTS tracks provided louder (improperly calibrated) bass.
IF the Dolby track has DialNorm, it will play back softer (typically 4dB lower) than the DTS track. But that doesn't mean the DTS track will provide "louder (improperly calibrated) bass". The low frequencies will remain proportional to the rest of the soundtrack, irrespective of volume level.