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DAC or Streamer with volume controlled AES/Coax output
DAC or Streamer with volume controlled AES/Coax output
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Old 25th June 2019, 10:51 AM   #1
de45dd is offline de45dd
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Default DAC or Streamer with volume controlled AES/Coax output

Hello,


I am searching for an Preamp/DAC/Streamer with USB-Audio-Input and an digital AES or Koax-Output where the volume of the digital output can be controlled digitally in 32bit or higher.
There are a lot of streamers with digital outputs but none of them can control the volume of them especially not in 32bit (lossless) or higher.
Is there any product available which can do that or maybe any diy-solution how to do that?


The background is that I want to build a new active speaker system build on the new hypex fa-modules (fa253/503). To avoid doulbe AD-DA-converstation I want to use the digital inputs (aes or koax) on the Fusion-Amps. Therefor I need an good volume control on the source (32bit or higher).
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Old 27th June 2019, 07:07 PM   #2
de45dd is offline de45dd
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No one an idea?
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Old 27th June 2019, 07:41 PM   #3
MarcelvdG is offline MarcelvdG  Netherlands
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AES3 and S/PDIF only support up to 24 bits wordlength (corresponding to a quantization noise floor of -141.48 dBFS unweighted with triangular PDF dither).
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Old 28th June 2019, 05:56 AM   #4
de45dd is offline de45dd
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ok didnīt know that. But I know that for example the "Storm Audio ISP 3D.32 Elite Digital Edition" or the "trinnov amethyst" can control the volume of the AES outputs digitally in 32bit. So how are they doing that?
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Old 28th June 2019, 06:04 AM   #5
MarcelvdG is offline MarcelvdG  Netherlands
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Apparently it has an AVB output, whatever that may be, rather than an AES3 (AES/EBU) output:

https://www.stormaudio.com/media/sto...8_28122017.pdf
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Old 28th June 2019, 06:16 AM   #6
de45dd is offline de45dd
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itīs also a digital version with AES outputs available.


https://www.stormaudio.com/media/sto...3_25082017.pdf
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Old 28th June 2019, 06:29 AM   #7
MarcelvdG is offline MarcelvdG  Netherlands
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Where did you find anything about the output wordlength of that version?
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Old 28th June 2019, 06:35 AM   #8
TNT is offline TNT  Sweden
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Quote:
Originally Posted by de45dd View Post
ok didnīt know that. But I know that for example the "Storm Audio ISP 3D.32 Elite Digital Edition" or the "trinnov amethyst" can control the volume of the AES outputs digitally in 32bit. So how are they doing that?
Maybe they mean that they use 32 bit internal "precision"?

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Old 28th June 2019, 06:38 AM   #9
de45dd is offline de45dd
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Default Strom Audio

I was in contact with the Storm Audio support and they told me that volume is controlled in DSP chain which is floating point 32bit. Signal is then getting converted to PCM and output in 32bit via AES/EBU.
They told me that now it depends if your AES input can handle 32bit if not will be "downsampled" to 24bit.
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Old 28th June 2019, 09:15 AM   #10
de45dd is offline de45dd
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ok I have read that if you we are doing the volume control digitally you will lose 1bit per 6db attentuation.


So in case the Storm-Audio will do volume control in 32bit FLOAT in the DSP-chain but the AES-Input (hypex fusion) only allows 24bit. So letīs make an example when I play 16bit file. This file gets upsampled in the DSP to 32bit and volume control will be made here in 32bit.
Then the file gets downgraded to 24bit because AES-Input can only handle 24bit. Right?



Regarding the 1bit/6db loss rule I mentioned above.
What is now the calculation starting point for calculating the bit-loss for the attentuation? The source-file (16 bit), the dsp chain/volume control (32bit) or the ouptut bitrate (24bit)?
Maybe someone with more technical background can bring a bit more light into this confusing scenario.


In general to the active speaker guys here. How are you doing your volume control? Digitally at DSP-step or analog after DA-converstation?
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