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When should we expect a GSP DAC?

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    Posted: 10 Sep 2012 at 11:14pm
The title says it all, but I'm also interested to know what to expect it terms of inputs, sample rates per input type, price etc.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 11 Sep 2012 at 9:44pm
Thanks for your question ICL1P.

I'm working on two...

1] The "big DAC", a 24 bit 192kHz S/PDIF, 24 bit 96kHz optical (Tos-link) and 16 bit 48kHz USB. The price I don't know yet because it's too early in development to hazard a bill of materials cost.

2] The "little DAC" (USB powered), probably won't be popular amongst specification fans at 16 bit 48kHz, but I'll put it out via the loaner program to let people listen to the result and hopefully they'll comment on the analogue side.

Both DAC's analogue outputs will not be "run of the mill". I've been asked numerous times to do a DAC with the same sonic capabilities as the phono stages - the Reflex M in particular. This will also mean the analogue output tech spec won't look as good as all those pattern parts you read about in the glossies. Does this worry me? Not at all. There won't be anything audible other than the music, but I suppose the "bat-eared" may comment on hearing a minuscule amount of hiss at volume levels that if music was playing would take your head off.

We're a few months away from any launch, but the easiest job is the "little DAC", and that will feature a "free" USB cable on an initial selling quantity. The cable will have had my "Lautus" interconnect treatment - it does make the difference.

I also want to put as many other features on them as I can. The "little DAC" will hopefully have optical and S/PDIF outs in addition to the line/headphone output. Still looking at what's possible on the "big DAC".

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Post Options Post Options   Thanks (0) Thanks(0)   Quote ICL1P Quote  Post ReplyReply Direct Link To This Post Posted: 12 Sep 2012 at 8:05am
Thanks for the full reply Graham. I won't claim to understand all the techie stuff; i find it all quite bewildering! Will the Tos-link support all sample rates upto 98KHz?

I have recently been caught out. I compared three DACs (Rega DAC, MF M-1 DAC and Arcam rDAC) taking a wired and Toslink stream from iTunes - iMac - Airport Express to my Roksan Kandy Amp and Spendor A5s. All was at 44.1KHz. The cheapest DAC, the Arcam, sounded best and was closest to listening to the CD played on my Cyrus CD8 SE so I bought it. Since then I swapped the Airport Express for an Apple TV3 and it's all gone pear shaped. The ATV3 upsamples everything through it to 48KHz and whilst the Arcam rDAC supports 32KHz and 44.1KHz vis toslink it doesn't support 48KHz or higher. For this I would need a coaxial connection, but the ATV3 doesn't have a coaxial output.

I now have the Musical Fidelity M-1 on loan again and am hoping it sounds better after being well burned in.

Cheers
Ifor

Edited by ICL1P - 12 Sep 2012 at 8:08am
Ifor
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 12 Sep 2012 at 4:15pm
Ifor, quick correction - 96kHz not 98kHz - probably a typo.

The "big" DAC supports any of the regular frequencies up to 192kHz but the optical input is limited by the performance of the optical receivers available, so we use the fastest we can get which will do 96kHz with some margin above that.

The DAC uses a Wolfson chip-set which works out what it's receiving so there isn't a problem.

I tend not to follow anything other manufacturers do and do things the way I think they should be - don't take this as being arrogant.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ICL1P Quote  Post ReplyReply Direct Link To This Post Posted: 12 Sep 2012 at 5:01pm
Graham, it was indeed it was a typo. Smile

One last question for now, how many coaxial and how many optical inputs are you planning for the "big" DAC?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 12 Sep 2012 at 9:38pm
Many Thanks for the update.
Interesting times ahead, I'm particularly looking forward to the little DAC, which will no doubt whet the appetite for the big DAC.
I also note with interest the compatibility problems that ICL1P suffered. such problems can be difficult to avoid given the lack of, or misinformation that accompanies many products or their advertising. It does lead to the conclusion that many don't really understand their own products.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ICL1P Quote  Post ReplyReply Direct Link To This Post Posted: 12 Sep 2012 at 10:20pm
Originally posted by BackinBlack BackinBlack wrote:


I also note with interest the compatibility problems that ICL1P suffered. such problems can be difficult to avoid given the lack of, or misinformation that accompanies many products or their advertising. It does lead to the conclusion that many don't really understand their own products.


I looked into this a bit further today and found that Arcam's own literature for the rDAC is inconsistent. The User Manual states that the optical input supports 44.1 KHz and 48KHz, but the Service Manual states quite clearly that 48 KHz is not supported. I think I might have a case for getting my money back.

Ifor

Edited by ICL1P - 23 Sep 2012 at 7:17pm
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