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Old 7th July 2011, 01:55 AM   #21
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Quote:
Originally Posted by erin View Post
IMO, to put it simply, non oversamling avoids the use of the SAA7220 upsampling filter chip in the signal path, which for various reasons, results in "bad" sound.
When this chip is bypassed most people notice an improvement in the sound.
The problem is the noise generated by the power requirements of the SAA7220 ( 180mA draw at 5V ). So yes, cutting out this chip does little to settle the question of whether OS or NOS sounds better - its influence on the power supplies (rather than the signal path) is what knackers the sound. I noticed a big improvement in the sound myself when the SAA7220 chip was removed - much lower sibilance.
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Old 7th July 2011, 02:50 AM   #22
erin is offline erin  Australia
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I also was not going to enter the debate about NOS vs OS, only point out that in this case, it sounds better when removed

Last edited by erin; 7th July 2011 at 02:54 AM.
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Old 7th July 2011, 02:57 AM   #23
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Yep, I was concerned to head the OS vs NOS discussion off at the pass too
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Old 7th July 2011, 03:03 AM   #24
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Discrete sounds better also than any Opamp(6 kinds) I used in different players sony555 and diy dacs. My discrete i/v has way more details and doesn’t curtain the sound. You can hear distinctly every words with all the voices of a choir singing along. Tda1541 is the best dac I experienced, following with cirus logic, sabre, akm. To me the sabre and akm are not 'in same league' but the cirus is awesome. The pcm56k is kind of good but too electronic sounding with an overemphasis of middle bass. The cirus has incredible highs but so far lacks the instruments separation a tda1541 has.
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Old 7th July 2011, 01:36 PM   #25
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I head that grounded grid is good for i/v conversion.

how would you make this work for the tda1541
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Old 8th July 2011, 12:10 AM   #26
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What would be the best way for connecting the DAC to the power amp?

DAC->IV Stage->Volume Pot->Power Amp

or

DAC->IV Stage->Volume Pot->Preamp->Power Amp


If I need a preamp I can integrate it into the DAC enclosure, I think I want to use tubes for the preamp what would be the best circuit for driving the power amps (10K impedance) directly.
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Old 9th July 2011, 02:27 PM   #27
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anybody
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Old 9th July 2011, 02:36 PM   #28
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Quote:
Originally Posted by benproiii View Post
anybody
You need to determine whether you need the pre amp stage. If the PA is sensitive enough and/or the the output of the I/V stage is high enough, then no need for a preamp, or just have a passive one - which is a stupid 'hifi' name for a vol pot.

However, in a nos design you will have to filter the output before it gets to the PA and the opamps are the simplest option.

Suck it and see!
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Old 12th July 2011, 12:34 PM   #29
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What is DEM Re-Clocking exactly and does it improve the sound quality?
Can I add DEM Re-Clocking to the AnalogMetric Board by copying the setup in the first picture I uploaded.


I have found two output stages that seem to be really good, Which one has the lowest distortion, noise, and best SQ?

for Pedja Rogic DDNF IV Stage can i sub the transistors for BC560C,BC550C and the JFET for a BF256?

can remove the DC blocking cap from "DDNF IV Stage" if it goes through a 10K volume and into the Pass Labs B1 Buffer stage?
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File Type: jpg IV.jpg (66.5 KB, 202 views)
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Old 12th July 2011, 01:47 PM   #30
erin is offline erin  Australia
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Quote:
Originally Posted by benproiii View Post
What is DEM Re-Clocking exactly and does it improve the sound quality?
It improves EVERYTHING!

Quote:
Originally Posted by benproiii View Post
Can I add DEM Re-Clocking to the AnalogMetric Board by copying the setup in the first picture I uploaded.
Yes it works fine.

Quote:
Originally Posted by benproiii View Post
I have found two output stages that seem to be really good, Which one has the lowest distortion, noise, and best SQ?
Neither of them filter out the sampling frequency.

Have you even built the DAC yet? Respectfully, as advice, you ask a lot of questions, and many questions you ask will involve subjective replies. It may be time to build some things and make up your own mind. Then you can let us know what you think.

Last edited by erin; 12th July 2011 at 01:58 PM.
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