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Review and Measurements of PS Audio PerfectWave DirectStream DAC

graz_lag

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... If you look on top right you see the logo "Pico." PIco makes very popular PC based oscilloscope ...

Mr. T Smith may want to consider this "Pico" instead, it will help him a lot in going thru this catastrophic review of his DAC ...

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Thomas savage

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JJB70

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They don't like us over there , but we are all so charming ha ha ..

Weeeeellllllll Thomas, what a great comment...waffle waffle waffle...…..gibberish gibberish...…..burble burble....and that's why the DS DAC is such a terrific product, be good y'all
 

617

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Please don't tell me they designed the dac with a picoscope.

I think as a rule of thumb your instrumentation should cost more than 1/4 of the retail of the product you're designing.

This does raise an interesting question though - what is the barrier to entry for designing high quality audio electronics? What's the cheapest device that can reliably measure audio performance to say 110db?
 
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617

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Picosope is not a problem - designing a well performing DAC is about the skill of an engineer, not about a top class measurement instrument.

I'm not familiar with audio electronics design, but how do you know if your design performs well if you don't have instrumentation to confirm that?
 

Krunok

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I'm not familiar with audio electronics design, but how do you know if your design performs well if you don't have instrumentation to confirm that?

Picoscope is good enough to check your design if you use it properly.
 

SIY

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Please don't tell me they designed the dac with a picoscope.

I think as a rule of thumb your instrumentation should cost more than 1/4 of the retail of the product you're designing.

This does raise an interesting question though - what is the barrier to entry for designing high quality audio electronics? What's the cheapest device that can reliably measure audio performance to say 110db?

Sound card plus interface. Say $500 or so.
 

617

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Sound card plus interface. Say $500 or so.
Oh so essentially just a really good ADC and software? Is it easy to find ADCs which have a noise floor at -120db?
 

scott wurcer

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Picosope is not a problem - designing a well performing DAC is about the skill of an engineer, not about a top class measurement instrument.

Right, given time to build some external test fixtures you could do a lot with nothing but that picoscope. That's engineering.
 

SIY

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Oh so essentially just a really good ADC and software? Is it easy to find ADCs which have a noise floor at -120db?
Noise floor, sure. Total noise, harder, but if you use a low noise interface like the Autoranger, you can hit that with ease.
 

Krunok

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Right, given time to build some external test fixtures you could do a lot with nothing but that picoscope. That's engineering.

Exactly. I remember seeing far better DACs than this PS piece of schiit designed with less capable intruments than Picoscope.
 

617

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Exactly. I remember seeing far better DACs than this PS piece of schiit designed with less capable intruments than Picoscope.

I have a DMM, maybe I should switch careers
 

Blumlein 88

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I'm learning lots of things about test signals I never knew reading that thread with Ted's posts in it. Quite entertaining really. Ted is able to almost show his design gets close to 16 bit resolution. Besides what difference does it make. He says the ear can filter out white noise very easily.

I'm also learning lots about Amir I didn't know. I bet Amir doesn't know it either. :)
 

Krunok

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I have a DMM, maybe I should switch careers

I can't really advise on that - neither do I know what DMM is nor I know how old are you to estimate the risks of switching the career. :)
 
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AudioSceptic

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I'd probably be satisfied with those as well, but that misses the point. A single SINAD score doesn't tell us everything we might need to know about the DAC. My example would be fine on a sensitive horn system, but a DAC with -90dB noise floor might not. Both could have the same SINAD ranking.
Would -90 dB be audible, even with very efficient speakers, and in any case, that's the DAC, not the amp, and wouldn't you reduce the power/gain from the amp to compensate for the increased efficiency?
 

Shadrach

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The important point is getting buried in the chucking graphs around and ego pissing contests again.
It doesn't matter what instruments got used in the design, or the measurement of the final product.
It doesn't matter if the design provides a dac that performs better than out hearing can determine.
Sure it's a nice looking unit. That does matter but it doesn't matter $5,700 worth!
There are a lot of dacs that will perform to this level and above in the $200 to $300 price bracket.
There are a few that will match it for $100.
All I would want to know if I could be bothered to ask is how is the price justifiable?
You could buy the all singing all dancing Benchmark HGC for a third of the price if you wanted one of the best performing dacs.
There are plenty of others that look good and perform better even if that performance is beyond our hearing capability.
It's the price, not the performance with many of these products. This particular dac is a rip off. It's that simple.
 
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