A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 21 - diyAudio
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Old 13th March 2013, 01:56 PM   #201
dddac is online now dddac  Germany
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Join Date: Jul 2003
Location: Wiesbaden
Default New Pictures

here is a very nice DDDAC "Schaeffer Design" from Switzerland.



DDDAC1794 - 4 Deck
5V DDDAC Power supply
12V DDDAC Power supply
Sowter Outputs Transformers

On the Transformers I got this Feedback
Update 11.3.2013: Doede sent me two Sowter 1298 transformers, which he designed as an alternative to the standard coupling capacitor in the analog out line. Apart from avoiding the coupling capacitor in the signal, the transformers also allow using the inverted output of the DAC chips, thus cancelling out even-order distortion. I immediately noticed the sound improvement with the transformers. The music sounded as if the musicians just got a pay increase! The transformers were expensive, but the money was well spent in my case.

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Old 13th March 2013, 01:56 PM   #202
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I order my case at AE Europe, a very good transformer maker in the Netherlands. It is this one

De transformatoren specialist, transformatoren voor iedere toepassing

Only not with picture, but just look at my build DAC's (2 already). Now both have there mundorf silver/gold/oil cap so soon I can make a real good review between on deck, and 4 decks.

Still a small question. If the length of the cable doesn't matter, is it "bad" for the sound to use your spdif input? Because then there are some relais in the digital signal path. My thoughts were....less is more, but if there isn't any differance.....
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Old 13th March 2013, 04:01 PM   #203
IanS1 is offline IanS1  United Kingdom
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Jan,

I'm using Doede's SPDIF board with my DDDAC and it sounds excellent. I have restricted it to 44.1k and use the onboard clock for re-clocking my SONOS ZP80 Streamer. At the moment, I prefer the SPDIF to using the WAVE I/O with a dedicated PC streamer. That may change once the PC streamer has a linear PSU though.
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Old 13th March 2013, 04:04 PM   #204
IanS1 is offline IanS1  United Kingdom
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Quote:
Originally Posted by dddac View Post
On the Transformers I got this Feedback
Update 11.3.2013: Doede sent me two Sowter 1298 transformers, which he designed as an alternative to the standard coupling capacitor in the analog out line. Apart from avoiding the coupling capacitor in the signal, the transformers also allow using the inverted output of the DAC chips, thus cancelling out even-order distortion. I immediately noticed the sound improvement with the transformers. The music sounded as if the musicians just got a pay increase! The transformers were expensive, but the money was well spent in my case.

The Sowter transformers are on my wish list.
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Old 13th March 2013, 04:57 PM   #205
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Quote:
At the moment, I prefer the SPDIF to using the WAVE I/O with a dedicated PC streamer
Hallo Ian,

How do you play your files with the PC streamer? I assume you are able to choose the driver for output?

Regards,
Bas
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Old 13th March 2013, 06:50 PM   #206
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Quote:
Originally Posted by dddac View Post
For test purposes I have been going beyond 1 meter without any issues....

The short cable is just cost saving... no just kidding if you need a longer cable, I am happy to make one for you!

Doede
Hi,

The shorter the cable the better, this is same as with all cables. You can notice sound quality decreasing when using longer usb cables, same applies to i2s cables. I am using a cd tranport with philips cd pro loader and put out i2s to a modified tent dac in a seperate box; you can notice sound quality decreasing with longer cables. However using longer i2s cables might at first not be audible, when your system developes it can become the bottle-neck.

If you want to test this try an usb extension cable, the difference must be noticeable.

Regarding my dddac setup: I plan to integrate it with an alix pc board in one case, this keeps the usb cable also very short, I can even solder the cable directly on the alix and waveio so no connectors are used.

Do not forget: a lost bit on the way to the dac can never be recovered. There is a lot of debate about Bit Perfect output of the usb stream but lets not forget the influence of the cables!


Kind regards,
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Old 13th March 2013, 08:04 PM   #207
IanS1 is offline IanS1  United Kingdom
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Quote:
Originally Posted by Bas Horneman View Post
Hallo Ian,

How do you play your files with the PC streamer? I assume you are able to choose the driver for output?

Regards,
Bas
Hi Bas,

The streamer isn't actually mine, it's a friends who came to listen to the DDDAC last weekend. The media player is JRiver and it is set-up to output through DDDAC USB driver.
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Old 13th March 2013, 08:54 PM   #208
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Default I2S cable length

Quote:
Originally Posted by AudioH View Post
I'd like to move the Wave IO Board to the back of the enclosure, along side of the main DAC baord, rather than directly in front as the short interconnect cable implies such that all signal inputs and outputs are on the rear face. Is there a limit to the I2S cable length from the USB board to the main DAC board before problems occur ?

Regards
For USB a good quality one will be a safe choice. Longer than one meter is only adviseable on Doede's recommendation.
I2S? Please as short as possible. A safe max. ,anywhere on the Net advised,
is 10cm! With shielded 50 Ohm U.fl cables you will have a litlle bigger margin. All wires or cables of exactly the same lenght.

Last edited by ed linssen; 13th March 2013 at 09:11 PM.
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Old 13th March 2013, 09:27 PM   #209
AudioH is offline AudioH  United Kingdom
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Default I2S Length

Quote:
Originally Posted by ed linssen View Post
For USB a good quality one will be a safe choice. Longer than one meter is only adviseable on Doede's recommendation.
I2S? Please as short as possible. A safe max. ,anywhere on the Net advised,
is 10cm! With shielded 50 Ohm U.fl cables you will have a litlle bigger margin. All wires or cables of exactly the same lenght.
Thanks Ed, I don't think i'll need longer than 10cm in any case.
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Old 14th March 2013, 12:06 PM   #210
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@Ian,

I first only used also Doede's SPDIF input, without clock, and a Sonos ZP90. It sounded good. Then, I sold the ZP90, got myself an extra Macbook Air for music only. It really sounded better, but the greatest jump forward was Doede's psu for the Waveio. The DAC played already with a Tentlab psu, so that was ok.

My opninion is/was that leaving the spdif unit out of the i2s line it would sound better...but I didn't test it yet...
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