dsd64

[completeluxury]

Does anyone know if DSD64 is still converted to 24/192 by the devialet the same as it is with other PCM sources?

[Pim]

I guess it must be when you use SAM. Nothing can be done with DSD other than convert it to analog.

[completeluxury]

to be honest ive never even read up about what happens with a dsd signal once it reaches the dac on any peice of equipment.

if it was just going to be converted to 24/192 like regular pcm then what is the point?

[Antoine]

No, it's converted to the native 40 bit 384kHz, see the whitepaper below, page 2.

https://en.devialet.com/assets/V3/pdf/Wh...xpert-.pdf

Edit: although I'm thinking this could be just part of the story. I suppose it must be converted later again to be processed by the PCM1792 DAC chips. I'm not sure if, how or what.

[completeluxury]

im thinking it might be worth finding out from devialet.

im trying to figure out the optimal output from a program like HQ player to the devialet range. im thinking that converting to 24/192 for all formats would be the best to bypass the pcm1792 dac chip!

[Antoine]

I agree, to get the best understanding we'd need some clarification of Devialet or an independant industry veteran/DSP specialist.

You can't bypass the two internal PCM1792 chips BTW, they're the DAC chips converting the digital to analog just before the the speaker terminals. What we possibly could bypass/prevent are unnecessary sample rate/freq. conversions whether inside an internal FPGA or (A)SRC chip. I've wondered myself often as well if I were to use a player like HQPlayer what output format would be optimal, I'm also -guessing- this to be 24/192.

[completeluxury]

hmm.. poor wording on my behalf there!

we cant bypass the chip, but to have as little done by them as possible would be ideal.

i think that having HQ player converting all formats to say 24/192 with the convolution filters i have made and being able to bypass any other format conversions would sound better than the chipset doing the conversion.

if its 2 chipsets it might actually be best to send it at 384 khz... might be fun to test.

[Antoine]

I agree. Ideal would be to send the Devialet the Expert internal native bit/sample rate (so that no conversions are required) but I'm afraid the digital inputs are really limited to 24/192 or DoP (in our case DSD64 over PCM) and won't support higher sampling rates even if the FPGA/DSP internal native bit/sample rate is 40/384.

Even if 40/384 would work you'd need a very powerful computer for it but I don't think there are interfaces that support a bit/sample rate that high. AES/EBU and S/PDIF are limited to 24/192 and even USB Audio 2.0 is limited to 32/384.

PS. I found this by Mauidan (it gives an additional hint but I still think this isn't the full story):

I asked Devialet how it handles the "Devialet internal PCM 40 bit/384kHz processing bitrate," If the PCM 1792 DAC chip in the Experts are limited to 24bit/192khz?

Answer:
In all our Expert units, we use one 1792 chip per channelallowing a doubled bandwidth compared to stereo designs employing only onechip.

[completeluxury]

well when it comes to powerful computers im pretty sure you and me get by just fine.

Word on the street is HQ player will be fully integrated with roon by the end of the year. ive already got the roon membership i think i might start playing around with hq player see if its really worth it or not.

[Antoine]

Yes, I've heard too. A HQ Player NAA supporting Roon on a Sonore uRendu could become interesting.