I have discovered another variant to use the iPeng local playback
feature on an iThingy device. You can hook up your iThingy with the
Digital AV adapter dongle (30-pins to HDMI, with a second port to keep
your iThingy charged), and then use HDMI to connect your AV receiver
(and let the receiver do the D/A conversion). That works mostly fine for
me, but:

- CDs served from my NAS using LMS appear to be upsampled from 44.1 kHz
to 48 kHz (at least that's why receiver shows). I assume that iOS does
that somewhere along the way when the Digital AV adapter is detected.
- Surround files (Dolby Digital 5.1, DTS 5.1) wrapped in PCM (SPDIF
compatible) and sampled at 48 or 96 kHz are passed through unchanged and
are recognised as surround by the receiver and properly decoded.
- Surround files (Dolby Digital 5.1, DTS 5.1) wrapped in PCM (SPDIF
compatible) and sampled at 44.1 kHz are messed up. They are upsampled to
48 kHz along the way (my receiver shows a PCM stream at 48 kHz) and then
produce white noise. 

The latter is my only problem as I have a fair number of DTS CDs sampled
at 44.1 kHz. I assume the resample to 48 kHz is done by iOS, in which
case I suppose I have no recourse other than to resample the source
files to 48 kHz before wrapping them in a PCM stream.


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