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Practical Implementations of Alternative Post-DAC Filtering
Practical Implementations of Alternative Post-DAC Filtering
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Old 29th September 2015, 02:46 PM   #501
Joe Rasmussen is offline Joe Rasmussen  Australia
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Originally Posted by anatech View Post

It behooves one to gather all available evidence before reporting the results. It makes no sense to stop short with any examination.
Chris, that is exactly what we did - and Ken pointed out a long time even before this thread started that there was work to do - nobody has even suggested "to stop short with any examination."

But when you have usable and practical info to share, then why not do that, this is first DIY and then science. Or we may have to change the name of www.diyaudio.com - and we are not.

Would it be too much for me to say... that I am being slighted for a gift?

If you find something and you know it works and then share it, what would you call it?

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Old 29th September 2015, 02:51 PM   #502
Joe Rasmussen is offline Joe Rasmussen  Australia
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Originally Posted by SY View Post
If there's a discernable difference in the sound, then there will be a significant difference in measurements. The measurement results allow one to pin down mechanism.
Absolutely !!!

That's a real challenge.

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Old 29th September 2015, 02:52 PM   #503
marce is offline marce  United Kingdom
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Practical Implementations of Alternative Post-DAC Filtering
It is DIY based on science... how can you DIY something electronic without some basic understanding of what is going on, same with any DIY you have to have some basic idea of what you are doing....
 
Old 29th September 2015, 02:54 PM   #504
scott wurcer is offline scott wurcer  United States
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Originally Posted by Coris View Post
But you have to agree that you do not know at all what is the differences in sound coming out of a standard device, and out of a device with this filtering on it. You just do not know that.
My question remains does ANY filtering directly at the DAC/analog world interface achieve the same or similar result.

No one wants to clarify, is tuning the filter to almost exactly -1dB at 20k necessary or do any of the other suggestions over the last 20 or so years have an equal chance of doing the same thing? For instance the trick of using a 50 Ohm or less resistor and a cap with an ultra-low noise amp in lieu of an I to V is OLD. Am I to believe tuning it to -1dB at 20k vs flat to 30k or so is a vast improvement?
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Old 29th September 2015, 03:10 PM   #505
anatech is offline anatech  Canada
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Practical Implementations of Alternative Post-DAC Filtering
Hi Joe,
#2 was in answer to Ken's responses only.

Many DIY folks have quite good equipment, and if they don't they do have some basic stuff to fall back on. You are involved in this hobby rather more completely than the average DIY'er would be. I would expect you to acquire the necessary equipment just to make your own life easier. Once you factor in your other businesses, it stuns me that you don't have any of these things.

I will accept that I have more gear than the average person, and more than you would need. But because I charge for some of my work, I do require a means by which can assure my work is of the quality I say it is. It also really makes study and research much, much easier. It also defends me should questions arise as to the state of anything I have worked on. I also take pictures of my work, before and after.

I don't think you are being slighted for a gift. I think that you agree to have this work be verified by others, yet step backwards when the time to do something approaches. I think that you need to run cleaner and more forthright than the average DIYer, and the big factor is that you charge a great deal to make these changes for those who can't do the work themselves. I will say that the charges you ask for place you in the realm where full instrumentation is expected along with exact measurements and technical study is required.

Joe, your stance on these changes place you rather higher than pure DIY. If you want to walk the walk and talk the talk, you have to be responsible for your work and experimental data that brings you there.

Joe, this is important. Your information on CD clocks is wrong. Take that stuff down and study the material before agreeing to perform any more of these clock changes. This really is a black and white issue and you are in error. Show that you are a responsible DIYer or tech or whatever you want to claim you are.

Best, Chris
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Old 29th September 2015, 03:14 PM   #506
Coris is offline Coris  Norway
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Practical Implementations of Alternative Post-DAC Filtering
Quote:
Originally Posted by scott wurcer View Post
My question remains does ANY filtering directly at the DAC/analog world interface achieve the same or similar result.

No one wants to clarify, is tuning the filter to almost exactly -1dB at 20k necessary or do any of the other suggestions over the last 20 or so years have an equal chance of doing the same thing? For instance the trick of using a 50 Ohm or less resistor and a cap with an ultra-low noise amp in lieu of an I to V is OLD. Am I to believe tuning it to -1dB at 20k vs flat to 30k or so is a vast improvement?
Well, this is a good point. I agree that this it should be clarified. I will take a closer look and do (plan) some experiments, but this not just right now... May you have a suggestion/proposal about an alternative filter/filtering?

Last edited by Coris; 29th September 2015 at 03:38 PM.
 
Old 29th September 2015, 03:56 PM   #507
billshurv is offline billshurv  United Kingdom
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Practical Implementations of Alternative Post-DAC Filtering
Here is an interesting board

ES9018 32bit Audio DAC PCB kit - DIYINHK. Supposedly based on the ESS9018 reference board and using Scott's finest 8-legs. Now assuming (and huge assumption) that this is legit in terms of not being an ESS RIP off and therefore naughty and (also huge assumption) that the layout is not so awful that good performance cannot be had, would this be a good starting point for experimentation? Certainly cheap enough to be no excuse, even with the USB-I2S or spdif-I2S board needed to get sound out.
 
Old 29th September 2015, 04:08 PM   #508
marce is offline marce  United Kingdom
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YUK! (Polite way of saying pile of )
 
Old 29th September 2015, 04:10 PM   #509
marce is offline marce  United Kingdom
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Now I have missed some of this thread, but wouldn't the size of cap and mounting option make a difference due to the parasitics being different or is there a recommended cap...
 
Old 29th September 2015, 04:15 PM   #510
billshurv is offline billshurv  United Kingdom
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YUK! (Polite way of saying pile of )
I did say huge assumption! It didn't look promising but I am not well enough versed in the art! And the official ESS boards are over $600
 

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