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Author Topic: Question about direct I2S DACs  (Read 10537 times)
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SeVeReD
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« on: November 18, 2007, 04:06:08 am »

I would like to hear people's/PeterSt thoughts on the USB-dacs that avoid S/PDIF conversion and use the "more direct" I2S path.  I know Wavelength Audio & Emirical Audio do this... does Berts' Twin+ usb dac take this route? is there any reason why this wouldn't be better than converting to S/PDIF?  I'd like to build a new computer and buy a dac probably around the time PeterSt puts out XXHE 1.0.

http://www.bd-design.nl/index1.html

http://www.usbdacs.com/   <<wavelength

http://www.empiricalaudio.com/
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0.9z-8-3a WAV/CUE files on HDDs via MB FW400>; Win7 pro ttp://www.phasure.com/index.php?topic=352.msg4021#msg4021); [XXHighEnd player  Qs 7, 0, 0, 0, 0; eng 4; adaptive; scheme#3; player priority low; thread priority realtime; clock res 5ms: SFS 420 Wink dac is 24/192 w/32bits; Play Unattended; Stop Services ticked; Wallpaper & Show Back ticked - Mirror Image unticked; Start Engine unticked;garbage collect ticked; copy files to XX-drive; *quad arc prediction upsampling*: straight contiguous:>PCI FW800 card>Fireface 800 DAC [latency 2048 samples for 176.4]; usb/ethernet/mb audio shut off @ MB
PeterSt
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« Reply #1 on: November 18, 2007, 08:28:00 am »

Quote
is there any reason why this wouldn't be better than converting to S/PDIF?

Uhhmm, would not, would ... don't ask those difficult questions !

I'm not sure what you'd want with the I2S connection, because I don't think there's anything to connect it to. Yeah, well, internally, but careful, because this is the most normal for most of the DACs (or CDPlayers for that matter).

In fact it is the other around, similar to how you put the question : would there be any reason to convert USB to SPDIF, while at the end of SPDIF in there it always has to be converted to something else (unless DAC chips exist that can take SPDIF).
So indeed uhhm, not, the TwinDAC+ converts to SPDIF (yes).

Concluded : I2S is direct only if it is used externally (like a CDDrive with I2S output).
I2S can be used as input for the DAC chip(s), so a USB-I2S (internal) conversion would be best. If the DAC chip takes another electrical signal, then obviously it would be best to convert to that directly.
(note : DAC chip can be input buffer etc.).


Quote
and buy a dac probably around the time PeterSt puts out XXHE 1.0.

You're saving money, are you ? hehehe
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For the Stealth III LPS PC :
W10-14393.0 - July 17, 2021 (2.11)
XXHighEnd Mach III Stealth LPS PC -> Xeon Scalable 14/28 core with Hyperthreading On (set to 14/28 cores in BIOS and set to 10/20 cores via Boot Menu) @~660MHz, 48GB, Windows 10 Pro 64 bit build 14393.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/0/0/*1*/ Q1Factor = *4* / Dev.Buffer = 4096 / ClockRes = *10ms* / Memory = Straight Contiguous / Include Garbage Collect / SFS = *10.13*  (max 10.13) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / Stop Desktop, Remaining, WASAPI and W10 services / Use Remote Desktop / Keep LAN - Not Persist / WallPaper On / OSD Off (!) / Running Time Off / Minimize OS / XTweaks : Balanced Load = *62* / Nervous Rate = *1* / Cool when Idle = n.a / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = Optimal / Time Stability = Stable / Custom Filtering *Low* (16x) / Always Clear Proxy before Playback = On -> USB3 from MoBo -> Lush^3
A: W-Y-R-G, B: *W-G* USB 1m00 -> Phisolator 24/768 Phasure NOS1a/G3 75B (BNC Out) async USB DAC, Driver v1.0.4b (16ms) -> B'ASS Current Amplifier -> Blaxius*^2.5* A:B-G, B:B-G Interlink -> Orelo MKII Active Open Baffle Horn Speakers. ET^2 Ethernet from Mach III to Music Server PC (RDC Control).
Removed Switching Supplies from everywhere (also from the PC).

For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.

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« Reply #2 on: November 18, 2007, 04:45:08 pm »

I'm in a mud pool because I do not like USB. I havent heard the pleasure to listen to most high-end implementations but I know that gaps are possible and that they ruin the listening experience by a factor of 9 out of 10.

A setup like Peter would be preferrable in my humble opinion, at least until some high-end manifacturer release a firewire DAC (with or without tubes, and with or without OS Happy ).
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(2nd Apr 2018)
Software:
W10 14393 Pro x64 | XXHE 2.10 | MinOS | Q=14x1/0/0/0/0 | SFS 5,19 mixed contiguous | Nervous rate 1 | 4096k buffer |

Hardware:
OrigenAE H5 case | E5300 fanless |  8GB RAM | Winmate DC-DC fanless PSU | OS on SSD | Renesas USB3 pcie card | Belden highspeed usb cable | Audio-gd dac19 NOS with sigxer F1 | My_ref_FE mono amps | Albedo Apex speakers
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