[Bluebuster83]

Using paplayer?

Yes. tried all 3 players, all of them white noise.

And you had DTS passthrough enabled (refer to my audio settings in post #18)?

Yes Sir.

My guess is that XBMC plays the WAV file as a plain WAV, passing the bit-perfect bitstream through to the amp and doesn't actually know it's playing a DTS file. However the amp "sees" (or should see) DTS audio data and decode it as DTS (in my case, anyway).

Actually, XBMC KNOWS playing a DTS file, because it is shown correctly in the fullscreen display of XBMC as "DTS 5.1".