Holo Audio: one of the best dacs ever? John Atkinson, H Reichert, M Lavorgna and S Deckert think so

I have read that the only function of their FPGAs is to improve the precision of the ladder network.

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Sure it is answering your question…you just don’t see it.

Ted uses the FPGA to do the upsampling/filtering/noise shaping. Holo Audio uses an R2R ladder circuit with PCM and a separate and discreet Dual Resistor Ladder network for DSD. The FPGA chips (there are several) are used for various control functions in the DAC. One of those functions is controlling the linear compensation of the ladders.

If you look at the measurements of the DAC, you would see that there really isn’t anything to be done to lower the noise floor or increase the resolution of the DAC.

The available upsampling filters are present in DAC chip.

So, no, upgrading the FPGA is far less likely to improve the sound of the DAC unless they find that some of the FPGA is doing something wrong. However, based on well the DAC measures, that is not likely.


I had a thought but it passed.

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In simple terms, an R-2R dac has an array of resistors arranged so that they operate in a stepped increase in values, first creating a value of R, them 2R, then 3R, etc. Each step is similar to the rung of a ladder, so they call it an R-2R ladder array. All the circuits I have seen pictures of also have the resistors arranged on the circuit board in rows, and each row resembles a small ladder with closely spaced rungs. I hope this translates well into French for you, and I’m sorry that others have given you a difficult time about this. Translators can sometimes fail to help our understanding, especially in the discussions using technological terms.


Sigh… I’ll do work for you.

Google “ladder DAC” and the fourth image is this:

Can you see the ladder?

It’s a bunch of resistors that are oriented in a way that makes them look like a ladder.

Each resistor “set” or “step of the ladder” is responsible for one of the bits of the digital signal from 1bit to 24 bit (when the ladder has 24 steps - the diagram above does not show the full ladder).


3 posts were merged into an existing topic: Holo Audio Spring 3 DAC Impressions

Thank you, @Jedi

It is pretty magical circuit.

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Thank you for your intervention @Elk. This aggressive troll and his foul language had to be stopped.

Back to audio and, more importantly, back to music.


Hopefully he does not return under yet another moniker, robinhood.


Yes, supposedly his « brother ».

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Adds another meaning to “oh, brother”

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Yeah, as the OP, I get all the posts in my email.
All this happened while I was sleeping (I am on vacation in Europe).
I couldn’t believe what I read in my email this morning.
Unreal, man.


Missed it, fortunately. Elk did his magic eraser thing. @Elk, thank-you once again.


It was starting to get ugly. Be very, very glad you missed it. I missed the last of it, but unfortunately was there for the beginning and middle of it. Elk done good!


What did I miss ? :sweat_smile:

This is funny considering you supported the guy and emboldened him….

I support anyone who is getting attacked. ANONYMOUS asked a simple question, and several people gave him all sorts of flack and attitude in response. All I did was apologize to him for that treatment.


I expect the group to be self-censoring to a degree as to what is proper or improper behavior, but he was in fact getting picked on. Arguably some of this was justified. This however got out of hand, provoking his over the top responses. There is enough blame to go around.

More importantly, the thread is cleaned up, no one is hospitalized, and the sun came up this morning. So let’s move on.


But, I do have to see a spine surgeon for my back, but he doesn’t have any openings until 9/27. Oh, well.