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Old 21st October 2012, 12:35 AM   #11
gk7 is offline gk7
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Quote:
Originally Posted by guy76 View Post
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i still not understand what will be more good if i connected squeezebox classy coax digital out to the rdac or use pc usb asy dac ?
...
Could you try to explain that sentence again ? What means "squeezebox classy" for example ?
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Old 21st October 2012, 03:18 PM   #12
TNT is offline TNT  Sweden
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Quote:
Originally Posted by gk7 View Post
The rDac hopefully has one (at least a better one than the PC).
Cool - seeing "has an asynchronous USB input (good for low jitter)" it seems like it was proposed that USB async = low jitter.

What is rDAC?

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Old 21st October 2012, 08:24 PM   #13
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Yes, ok not necessarily so. I just assumed that the clock of a decent DAC (in this case a Arcam rDAC Arcam - rDAC-/-rDAC-kw - Digital to Analogue Converter ) has lower jitter than a PC. I the case of asychronous the DACs clock is the master clock (the PC just delivers the data). Usually itīs preferred to use the clock of the DAC as the master clock, thats the way itīs done in studios (AES/EBU).
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Old 21st October 2012, 11:35 PM   #14
Pano is offline Pano  United States
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For me it just boils down to what is a clean digital source and how does the DAC deal with jitter? Since I have no way of directly measuring jitter, I have to look the final analog signal and guess.

I have no problem getting bit perfect out of a media player over spdif or USB or both.
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Old 22nd October 2012, 07:41 AM   #15
gk7 is offline gk7
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Bit perfect and jitter are two entirely different things. For bit perfect you do not want to manipulate your player and/or OS the output (no EQ, no resampling). On a Mac for example it would be sufficient to set the volume at max., switch off EQ and in Audio MIDI Setup set the sample rate to match the file you play.
In the case of a SPDIF (and synchronous USB) connection the DAC regenerates the clock from the incomig signal. The DAC might have some circuity to lower the jitter of this regenerated clock.
In the case of asynchronous USB the internal clock of the DAC is used which should give lower jitter. If, and if yes, how much jitter is audible is debatable of course, but as the setup of the OP allows the "low jitter route" by asychronous USB, why not use that ?
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Old 10th January 2013, 08:48 AM   #16
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Originally Posted by gk7 View Post
Could you try to explain that sentence again ? What means "squeezebox classy" for example ?
I thinks he means Squeezebox Classic (3rd generation).
And he want's to know if he get's better audio from his Squeezebox or from a PC with an USB attached DAC.

By the way there is a similar question on this forum: Squeezebox > DAC vs PC > DAC Audio Quality?

Last edited by torusJKL; 10th January 2013 at 09:02 AM.
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Old 10th January 2013, 03:08 PM   #17
Eldam is offline Eldam  France
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Hi Guy,

Got a squeezebox duet first if you find, a clasical after in second choice.

Used standalone it's good for the price, but hard to tweak (try Lampizator : simple tweaks for digital layout are great). The problems is to change the out caps of the wolfson converter : hard with a risk of destroying the layout.

Note that you need a pc with a squeezebox classic or duet, you can too use a little server like synology which is cheap, logitechserver friendly, easy to mirroring with 2 x 2 Go disk. I like the remote solded with the duet and can use a freesoft even better for my android or iphone for pizzas and beers listening experiences shared with Paolo Fresu ,Led Zeppelin, Verdi without effort.

Better of course with a DAC with spidf from your squeezebox so the choice of pc or squeezebox is not for the sound if you have money for DAC. I assume that squeezebox duett if you can find one is for me the ultimate streamer because without wires from the CDs collection (wifi with buffer) to the amp with its remote digital level (thinked in term on pizzas experience). It's not easy to haveyour laptop (if you want no noise) and a wire through the room to your streamer (not WAF) or not biautiful near the speakers. I'm verry surprised then i find now good preamp or digital equipment without remote !

I've no problem with squeezebox server soft (but need 256 Kram just for it) with the 4500 Cds.

With pc or with squeezebox, i will take the Iancanada jitter killer for the DAC you want. I have a RaindropHui mono 1865 but with a lowgrade chip marked High (N-K grade). You have choice here with a lot of good design or commercial dac like CS4398 of hifimediy for 100 dollars !

So your problem for your dmaterialised project is with or without wires, which DAC at the end.

Hope my experience helps you

Eldam
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Old 11th January 2013, 04:20 AM   #18
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Squeezebox duet forms the basis of my mediadac (tda1541a s2 via i2s)... Very pleased with it
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Old 11th January 2013, 06:32 AM   #19
Eldam is offline Eldam  France
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Hi StudioStevus,

Yes a very good smart streamer (and radio an DAC all in one for the lazy audiophil), I can't understand why Logitech give it up ? In advance on its time when it was brandnew ? A financial like "our job is TV remote & computers items our patry" & the last audiophile of this company had a nervous breakdown after that ???

Do you use the spdif behind the ad hoc plug of your Duet or do you take the signal behind the r202 resistor on the layout ā la Lampizator ? Did you tweak it ? Saw here and there that people add a better powersupply (linear) but i found the little genuine one not bad at all with its long resistive wire between the cap of the layout and the "bad smps block"

Do you have the layout of Iancanada to feed your dc with a spdif to I2S signal ? (if yes did you see a greatr sound with the same DAC after ?)

Sorry Guy, I don't want to hijack your post, I'm very interested to by your question, cause i think like you as a non tech to understand that spdif was the problem if you don't use I2S and CDs...

Last edited by Eldam; 11th January 2013 at 06:35 AM.
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Old 11th January 2013, 07:34 AM   #20
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Quote:
Originally Posted by Eldam

Do you use the spdif behind the ad hoc plug of your Duet or do you take the signal behind the r202 resistor on the layout ā la Lampizator ? Did you tweak it ? Saw here and there that people add a better powersupply (linear) but i found the little genuine one not bad at all with its long resistive wire between the cap of the layout and the "bad smps block"

Do you have the layout of Iancanada to feed your dc with a spdif to I2S signal ? (if yes did you see a greatr sound with the same DAC after ?)
i have the sb in the same box as my dac.
- thereby taking i2s from somewhere on the board
- using a better power supply
- providing a stable clock signal to the sb from a masterclock

This is probably as much as one can do. Powering individual chips on the sb has probably no effect given that i am only using the processor and reclocking externally...
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