Man in a van wrote: 
> I have no idea if installing lame will help, but why not try ?

If by disabling native and transcoding AAC to force use MP3 (using lame)
make the stream playable it means there is a side effect in the
conversion (e.g. sample format such as S24le vs s16le) as the encoded
samples (AAC or MP3 ) do not reach the DAC.

It seems to me that the 48kHz capability of the DAC is not working. A
few years ago I remember a user with a secondhand SB3 with a similar
issues and it turned out the SB3 was modded and crystal for 48Khz was
disconnected. If a relay is involved for 48Khz - then it is possible the
DAC's 48kHz supporting circuit is broken.

OP should confirm that DAC can still plays 48kHz audio to determine if
the problem is an SBT incompatibility or a DAC h/w issue.

AFAIK LMS sends 24 bits stream to DAC no matter whether AAC / MP3 or
44.1Khz or 48Khz. I believe 16 bit sample source are padded to 24 bits.
However my knowledge on this is limited (and possibly wrong) so somebody
else can provide a definitive answer.


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