Sound quality limitations of Raspberry Pi + I2S DACs

Diy? Low-budget? Esoterics? Let's discuss about DACS!

Ads helps Volumio remain Free and Open Source. Please consider donating to help us continue to serve you.

Sound quality limitations of Raspberry Pi + I2S DACs

Postby skypickle » Fri Dec 30 2016 21:27

phalanger wrote:...
The following graph is telling, comparing the signal phase noise (result of jitter) of various setups. As can be seen, standard i2s solutions on the RPi, even with a low jitter Sabre DAC, perform significantly worse than a basic cd player, while the USB interface shows more potential.

Image
...

thank you for posting that image but I do not completely understand what the hardware underlies each graph
RPi I2S + ES9023 DAC
BBB I2S + ESS9023
USB-I2S-2+ ESS9023
USB-I2S-1+ESS9023

and what is the difference between USB-I2S-2+ ESS9023 and USB-I2S-1+ESS9023?
Random avatar
skypickle
Fresh off the boat
Fresh off the boat
 
Posts: 5
Joined: Fri Dec 30 2016 21:22

Ads helps Volumio remain Free and Open Source. Please consider donating to help us continue to serve you.


Sound quality limitations of Raspberry Pi + I2S DACs

Postby allo » Fri Dec 30 2016 22:29

None..they share the same databus
Random avatar
allo
Audiophile
Audiophile
 
Posts: 109
Joined: Sun Nov 13 2016 17:44


Re: Sound quality limitations of Raspberry Pi + I2S DACs

Postby santanacorreia » Sun Jan 01 2017 16:31

mictester wrote:We're talking £25 devices here guys - they will never match a £10k Linn streamer, but for the small investment it'll sound much much better than a USB DAC and make you smile knowing that you can spend the remainder of the £10k on content, nice wine and holidays.

You're partially right - with a reasonable DAC (not necessarily a laboratory-quality one) and I²S connection, it's indistinguishable fron a £10k Linn with most source material! Anyone who tells you anything else is just deluded (and desperately trying to justify his squandered £9,950!). The limiting issues are the housing of the DAC - it should be screened to prevent the analogue end of it picking up noise - and the power supply - don't dream of using any kind of SMPSU for your DAC!

Just for fun, I recently A - B blind tested a Raspberry Pi / 9023 DAC (homebrew) against a £4k streamer (I won't embarrass the manufacturer) and no audiophile, record producer, engineer or musician who tried the test could tell one from the other. This conclusively proves two things:

1. The manufacturers of high-end, high-priced hi-fi are full of BS and they're just selling a "brand name" rather than anything particularly clever or well-made

2. The Raspberry Pi is a wonderful little device (if a little under-powered in these days of 4GHz processors)!

Hi mictester,

What do you mean exactly by homebrew?
Random avatar
santanacorreia
Sunday DIYer
Sunday DIYer
 
Posts: 10
Joined: Wed Nov 02 2016 19:20


Sound quality limitations of Raspberry Pi + I2S DACs

Postby DilanRoster » Wed Jan 11 2017 11:03

I think these limitations can make sound worse, nevertheless, thanks for sharing!
Random avatar
DilanRoster
Fresh off the boat
Fresh off the boat
 
Posts: 1
Joined: Wed Jan 11 2017 10:17


Sound quality limitations of Raspberry Pi + I2S DACs

Postby alpuy » Wed Jan 18 2017 14:41

I saw that there were problems with the jitter and the 24 bits that can be solved with an external USB DAC.

Will i have any problem if i use a rpi shield with an optical output and connect it to the optical input of an integrated amplifier (Marantz 6005)? Does the jitter/24 bits problem still occur or as it is all digital, there is no problem?

Thanks
Random avatar
alpuy
Fresh off the boat
Fresh off the boat
 
Posts: 1
Joined: Wed Jan 18 2017 14:36

Previous

Return to DACs

Who is online

Users browsing this forum: No registered users and 0 guests