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Old 12th December 2008, 01:51 PM   #1111
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Yeah I was just reading through the thread? I take it noone ever figured out how to get i2s output? Also Russ I know you mentioned you have a few Squeezebox devices, do you think the SMC unit sounds worse then the Squeezebox?
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Old 12th December 2008, 02:04 PM   #1112
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Quote:
Originally posted by Dougie085
Yeah I was just reading through the thread? I take it noone ever figured out how to get i2s output? Also Russ I know you mentioned you have a few Squeezebox devices, do you think the SMC unit sounds worse then the Squeezebox?
I have gotten PCM (I can't recall if it was I2S or LJ/RJ) out of it, and it's not very hard. You just have to look at the datasheet of the DAC they used (I forget what it is right now, and I am no longer using the SMC so I can't check).

The SMC sounds fine when used as a SPDIF source, I did not do an in depth comparison with the Logitech stuff. I would not fret over using SMC, it preserved the signal intact with no re-sampling. if you can find one cheap, go for it, as it's a fun project with little risk.

Cheers!
Russ
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Old 12th December 2008, 02:30 PM   #1113
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Quote:
Originally posted by Dougie085
Yeah I was just reading through the thread? I take it noone ever figured out how to get i2s output? Also Russ I know you mentioned you have a few Squeezebox devices, do you think the SMC unit sounds worse then the Squeezebox?
If you are just using the S/PDIF output, the SMC will sound fine. I use mine as an S/PDIF source on my workbench, and it also feeds my RevC for listening while I work.

For general use I upgraded to a Squeezebox as I could no longer stand the slow menus of the SMC.
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Old 12th December 2008, 07:54 PM   #1114
gunwoo is offline gunwoo  Australia
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Hi Guys

Before I can even lay my hand on the current chip, ESS is going to launch a new reference DAC, below is the text copy from enjoythemusic.com

ESS Technology Audio, designers and manufacturers of high-performance digital video/audio semiconductors for the consumer digital entertainment, digital home and automotive markets, will be showcasing their Sabre32 Reference DAC. Heralded as the world's best 32-bit audio DAC with 135dB of dynamic range, this new chip is said to offer "unmatched sound clarity made possible by ESS's patented Hyperstream architecture and Time Domain Jitter Eliminator." The 24-bit Sabre DAC is designed into leading-edge high-end audio products by McIntosh, Krell and Samsung. The Sabre32 Reference DAC extends the musicality of the original Sabre Reference DAC from 24 to 32 bit music and raises its performance to 135dB dynamic range and -120dB THD. Total harmonic distortion is a low -118dB (0.00013%), the chip supports stereo analog XLR or RCA output, and has S/PDIF or I2S/DSD header input.

Here is the original URL where the text from
http://www.enjoythemusic.com/ces2009/preshow/b.htm
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Old 12th December 2008, 11:49 PM   #1115
peufeu is offline peufeu  France
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Default Re: Ethernet ?

Quote:
Ethernet is the most common used connection so why not with DACs ?
Will there be an ethernet connection in the future?

Here's a site of someone who has implemented a DAC with ethernet: http://audio.peufeu.com/node/10
Hey, i'm famous, lol.

Anyway, as for Ethernet, there are two flavours :

* the device is actually a media player and fetches compressed audio (flac) from the LAN. I'll assume the music files are stored on a RAID server.

In that case, there is no reason to use a cumtom device. Just use a fanless PC. It will be cheaper anyway, and the user interface will be a lot better than a 2-line LCD.

* the device is just a DAC, and a PC somewhere streams audio data to it.

This is what I implemented... there are several flaws. First, ethernet is not a low-latency medium. Second, you need a rather powerful CPU in the device to handle the traffic, because it can come in bursts. Realtime control is also an issue. It's difficult.

Since I don't see why I'd build a DAC without a FPGA in it, for the CPU I used Microblaze, which is neither free nor fast. It was barely enough...

In the end, since a mini-itx motherboard with an Intel Atom, with case and psu, is so cheap, I'm building an USB dac. I got a FPGA board with USB one week ago... I get about 40 MB/s bandwidth between it and the PC... USB is so simple... there is no need for a CPU... the PC is there for that. Don't reinvent the wheel. I got this board one week ago and it's been advancing pretty fast since.
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Old 13th December 2008, 07:46 AM   #1116
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@ peufeu

Interesting read. I didn't know that you dropped your ethernet DAC.

I am currently running USB PCM 2707 (DDDAC receiver) to feed
the Sabre DAC via I2S, which sounds better to me than the SPDIF
I tried.

One key issue though is the galvanic isolation of USB from the PC.
Otherwise you won't become happy. You're catching too much noise.

I use an Opticis fibre powered with a TeddyReg and battery on the receiver side.
I integrated the Opticis receiver box right into the DAC-box to avoid another USB
cable.

Cheers
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Old 13th December 2008, 08:11 AM   #1117
plep is offline plep  Belgium
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Default Re: Re: Ethernet ?

Quote:
Originally posted by peufeu


... I got a FPGA board with USB one week ago... I get about 40 MB/s bandwidth between it and the PC...
Hi Peufeu,
Most interesting. can you tell us more ?
You don't use a PCM 270x chip, don't you ?
Best regards
Philippe.
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Old 15th December 2008, 06:46 AM   #1118
knc is offline knc  Greece
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Default Active X-over + DAC

Do you have try tri-amp (with DIY FPGA active digital cross) using the ESS DAC ?
using either 6 channel of one ESS chip or 3 chip or even 6 chips ....


I am thinking to design/and build active speakers using ESS DAC chip.
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Old 20th December 2008, 06:12 PM   #1119
peufeu is offline peufeu  France
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Default Re: Active X-over + DAC

Quote:
Originally posted by knc
Do you have try tri-amp (with DIY FPGA active digital cross) using the ESS DAC ? using either 6 channel of one ESS chip or 3 chip or even 6 chips ....
I am thinking to design/and build active speakers using ESS DAC chip.
No, I don't have any ESS yet, it is the highest on my list to try, though. As soon as this FPGA thing will be able to do it, I want to try the ESS...


Quote:
Originally posted by plep

Hi Peufeu,
Most interesting. can you tell us more ?
You don't use a PCM 270x chip, don't you ?
Best regards
Philippe.
No PXM270x chip, it's a Cypress FX2 usb chip + a FPGA. Drawback is of course that I have to write a driver

Quote:
Originally posted by soundcheck
@ peufeu
I didn't know that you dropped your ethernet DAC. [....] One key issue though is the galvanic isolation of USB from the PC. Otherwise you won't become happy. You're catching too much noise.
Yeah, Ethernet turned out to be a hassle, the need for at least a 50-100 MHz CPU in the DAC was a real problem. USB is extremely dumb, so much better. There is no CPU in the DAC (well, there is a 8 bit uc, but that hardly counts...).

As I said in the other thread I plan to use IL261-3E to isolate the DAC chip.

I don't want to pollute this ESS thread, so give me a few weeks and I'll come back with something a bit more stabilized...
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Old 23rd December 2008, 01:09 PM   #1120
Telstar is offline Telstar  Italy
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Default Re: Re: Active X-over + DAC

Quote:
Originally posted by peufeu

Yeah, Ethernet turned out to be a hassle, the need for at least a 50-100 MHz CPU in the DAC was a real problem. USB is extremely dumb, so much better. There is no CPU in the DAC (well, there is a 8 bit uc, but that hardly counts...).


Go firewire
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