Hi
Regarding problems with lock on external DACS ...
About a year ago it was found that the Squeezebox digital output was
somewhat off 44.10KHz BUT ...
.... Sean quickly [as usual!] fixed this in the firmware.
Fortunately I have always routed Squeezeboxes via a
device that buffers the input in a FIFO
and then clocks it out using its own high-precision, lower jitter clock,
so any such inacurracy has never been a problem for me.
However, out of curiousity I yesterday connected a Squeezebox
to an Apogee Big Ben and it registers the Squeezebox at 44.13KHz :-O
[Another long-term issue has been the long settling time of the clock
when switching into 'PCM mode' so I left the Squeezebox on repeat
all night so that this was not an issue ...]
So, I'm wondering why the 44.13KHz:
(a) Has the firmware changed?; (b) Is this 'manufacturing variance'? :-O;
(c) ...
Clearly 44.13KHz is way out of the range of some 'high-end' DACs
(e.g. AudioSynthesis DACs have a capture window of only +/- 100ppm
- approx. 4Hz),
so this could be the cause of some peoples' lock problems.
I know other people who read (or at least read) this list
(such as Michel, Harry & Victor from the TacTHackers group)
have both Squeezeboxes and Big Bens
- what do you guys (or anyone else having the two) see as frequency
these days ...?
Regards
Mike
Regarding problems with lock on external DACS ...
About a year ago it was found that the Squeezebox digital output was
somewhat off 44.10KHz BUT ...
.... Sean quickly [as usual!] fixed this in the firmware.
Fortunately I have always routed Squeezeboxes via a
device that buffers the input in a FIFO
and then clocks it out using its own high-precision, lower jitter clock,
so any such inacurracy has never been a problem for me.
However, out of curiousity I yesterday connected a Squeezebox
to an Apogee Big Ben and it registers the Squeezebox at 44.13KHz :-O
[Another long-term issue has been the long settling time of the clock
when switching into 'PCM mode' so I left the Squeezebox on repeat
all night so that this was not an issue ...]
So, I'm wondering why the 44.13KHz:
(a) Has the firmware changed?; (b) Is this 'manufacturing variance'? :-O;
(c) ...
Clearly 44.13KHz is way out of the range of some 'high-end' DACs
(e.g. AudioSynthesis DACs have a capture window of only +/- 100ppm
- approx. 4Hz),
so this could be the cause of some peoples' lock problems.
I know other people who read (or at least read) this list
(such as Michel, Harry & Victor from the TacTHackers group)
have both Squeezeboxes and Big Bens
- what do you guys (or anyone else having the two) see as frequency
these days ...?
Regards
Mike
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