Heroes: Season 2 - Blu-ray Sound problems

[Steveiz]

Last nite we sat down to begin watching our Hereos Season 2 Blu-ray set. Everything sounded fine UNTIL the show began; the narration was Incredibly Loud and Very Distorted. No adjustment I made would eliminate the overload distortion. I checked other Discs in the Hereos set all were MUCH Louder than my usual Blu-ray playback and VERY distorted, mostly noticeable in the Center channel.
I then played back several other Blu-ray movies with DTS-Master Audio tracks(Independence Day, Planet of the Apes) and ALL was fine, excellent actually!
I have a Panasonic BD-10, so of course, I can only listen to the core DTS tracks.
Has any one else experienced this problem with the Heroes Season 2 set?