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Valab NOS DAC, anyone using it? - Page 2

post #16 of 54
10/31/08 at 9:21pm
If I'm not mistaken, the seller seems to have confused upsampling for oversampling...
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post #17 of 54
11/1/08 at 5:36am
Quick question, and one im surprised has only just popped into my head.

Why 8 DAC chips?
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post #18 of 54
11/1/08 at 11:13am
It supposedly improves resolution, reduces output impedance and obviates the need for op-amps in the output stage.

Phill
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post #19 of 54
11/1/08 at 1:14pm
I don't suppose you could elaborate? Im not very good with the actual electronic side of things.
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post #20 of 54
11/1/08 at 2:33pm
my guess is that they send the signal to each of the 8 DACs and then take some sort of average of the resulting signal...
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post #21 of 54
11/1/08 at 6:33pm
The signal passes from one chip to the next passing through all 8, as it passes through each chip it corrects for errors providing an improved signal vs one chip.

Phill
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post #22 of 54
11/1/08 at 9:59pm
Quote:
Originally Posted by tubes View Post
The signal passes from one chip to the next passing through all 8, as it passes through each chip it corrects for errors providing an improved signal vs one chip.

Phill
But I don't understnad this. Surely a DAC takes a digital signal and converts it to an analogue signal. If the digital signal passes through the first DAC, then we get a analogue signal coming out. How can this analogue signal be passed to the second DAC chip?
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post #23 of 54
11/2/08 at 12:23am
Good question, the info I have provided on the 8 chip configuration is what I have read from other Dacs using the same setup, beyond that I have no idea. It's nice to know how things work but my main concern is that it sounds good in my system, we shall see.

Phill
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post #24 of 54
11/5/08 at 1:23pm
Cheers for the info. Might do some digging around, must be an idiots guide around somewhere.

Looks like there are more back up on e-bay. Price increased. Over my budget. Humph.
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post #25 of 54
11/5/08 at 3:42pm
I've got one on the way too for my work rig. Bummer about the price increase though. Remember you can use the M$ Live Ebay cash back to get some money back on it as well.

I will post some impressions as well.
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post #26 of 54
11/5/08 at 9:05pm
I started a new post with some early impressions on my unit.

Phill
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post #27 of 54
11/6/08 at 3:54pm
Bought this two nights ago, I believe Phil already has his, looking forward to his impression.
The PCB is definitely different than Gigalab's Moon DAC. From just looking at the pictures, the Valab seems slightly better.

espressogeek, I picked up an Oppo 981HD from Woot a month back for $105 shipped. For this price, it's a great CDP: it has Optical and Coaxial, 5.1 analog out, as well as S-Video and HDMI. It's considered one of the best DVD upconverters at any price point...it just so happens to be the least expensive
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post #28 of 54
11/6/08 at 4:23pm
Can anyone tell me what the Moon DAC has to do with the Valab? Is it because it is a non-os?
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post #29 of 54
11/6/08 at 4:28pm
Very similar in execution, both are NOS, both use 8 x 1543 dacs, same receiving chip, looks like same transformer, same physical dimensions etc. there are also differences in the board layout etc..

Phill
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post #30 of 54
11/6/08 at 7:26pm
Quote:
Originally Posted by tubes View Post
The signal passes from one chip to the next passing through all 8, as it passes through each chip it corrects for errors providing an improved signal vs one chip.

Phill
No, that would be serial. Parallel means the original signal is split into 8 and each chip takes one copy, then there is an averaging of the outputs, theoretically this lowers the error down to below 1/2 LSB.
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