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View Full Version : Squeezebox SP-DIF parameters



Patrick Lim
2004-02-25, 11:23
I've got my SB playing through a Perpetual Tech P3A DAC. Both the co-axial
and optical SPDIFs work well. I'd prefer to use the co-ax but unfortunately
my CD player only has a co-ax, so the P3A uses the optical instead.

The v5.1 slimserver had issues with breaking lock between songs, and
occasional gaps - the P3A has an audible relay the switches in when it locks
onto the signal, so I was missing bits at the start of each song. HOWEVER,
the latest nightly builds appear to have solved all my issues: the SB
maintains the P3A's lock by outputting a 'silence' signal, and the
adjustment to the 44.1kHz signal seems to have stopped the gaps.

I believe the P3A reclocks the digital signal to reduce jitter, but as yet I
haven't done an A/B comparison with my usual CD source to see if the SB
digital out puts any unusual demands on the P3A. It sounds good anyhow.

For info, my music is in FLAC format on a homemade EPIA5000-based server
(500Mhz VIA C3 processor) running Gentoo Linux. Slimserver and FLAC decoding
take up between 10-20%, according to top. It struggled with transcoding to
MP3, but the latest LAME appears to be efficient enought to support all
three processes.

I haven't seen the P3A (or P1A for that matter) sold here in the UK, but
with the current US/UK exchange rate, who cares - order it direct from the
States, pay VAT and still save a bundle on what anyone would have charged
for it here.

Anyway, great work by all those on the SB team!

Patrick

Mark Bennett
2004-02-26, 02:28
Hi Patrick

Patrick Lim wrote:

> The v5.1 slimserver had issues with breaking lock between songs, and
> occasional gaps - the P3A has an audible relay the switches in when it locks
> onto the signal, so I was missing bits at the start of each song. HOWEVER,
> the latest nightly builds appear to have solved all my issues: the SB
> maintains the P3A's lock by outputting a 'silence' signal, and the
> adjustment to the 44.1kHz signal seems to have stopped the gaps.

This is good to hear, I've got the latest build, and I just need to
try it with my friends DAC.

Waht's the sound quality like when it's going through the DAC? Is
it as good as a CD transport?

Thanks,
Mark.