K&K Audio / Lundahl Transformers

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RAKK DAC II question

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Posted on November 7, 2009 at 10:37:19
KurtP
Audiophile

Posts: 217
Joined: January 25, 2007
 Almost done with my sorta-Raven rebuild. I had built one a few years back with amorphous LL1689PP, and loved it, but had a scoche of 120Hz hum I was getting from my cheap power supply iron injecting magnetic fields into the output transformers. This was also coupled with the RAKK DAC II with passive I/V.

Rebuild is just a few days away, and am happy to report (now that I have upgraded to the LL1683 and LL1685 for the power supply tranny and choke) immeasurable hum at the output. Also some simplistic testing with flying leads was showing bandwidth waaaay past 100 kHz. A tad bit of rising response unloaded, but I'm not going to let that bother me; Red Book is my source. I'm just happy to have strong response with transformer coupling past 22 kHz. Doggone, those Lundahls are nice !!

Anyway, to my question. I see advertised that the RAKK DAC II is good for 24 bit 192 kHz. I'm sure this has been discussed at length all over the place, but what have people successfully used with S/PDIF? I am interested in doing some testing with something beyond the Red Book frequency limitations, and was wondering what works on a practical level.

I have a Focusrite Saffire, and am probably going to use iTunes if that combo works.
Thanks !

24/196 is not a problem, either, posted on November 8, 2009 at 08:43:00
rickmcinnis@dogwoodfabrics.com
Audiophile

Posts: 723
Location: Atlanta
Joined: December 15, 2003
 Feeding the RAKK DAC with a JULI@ sound card from upsampled files, it works very well.

Who knows what difference it might make but I am using BNC connectors at each end and the baseline STERIOVOV digital cable which is inherently BNC (one uses adapters for RCA).

RE: RAKK DAC II question, posted on November 7, 2009 at 13:14:08
KevinC
Manufacturer

Posts: 1999
Joined: April 19, 2001
Contributor
  Since: October 7, 2002
 When I had a PS Audio PW Transport on loan I loaded one of the Reference Recordings HR-X discs into it and listened very happily to 24/176 through the SPDIF input. If you have the appropriate sound card in your computer you can also play these discs from the computer, as you can 24/96 downloads, which are readily available these days on-line.

Kevin Carter
K&K Audio
www.kandkaudio.com

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