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XXHighEnd > Ultimate Audio Playback > Your questions about the PC -> DAC route > USB bandwidth
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Author Topic: USB bandwidth  (Read 12607 times)
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vrao
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« on: January 17, 2015, 06:41:39 pm »
After a talk with a manufacturer, I found not all USB cables are the same, most bandwidth limited.
So question is what mb/s is required for 768/32? And can our present USB cables handle it?

VJ
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Nick
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« Reply #1 on: January 17, 2015, 10:49:19 pm »
VJ hi,

768 by 32 bit requires bit transfer at 24.58Mhz. USB 2 in its fastest mode (used by the NOS1) has a carrier frequency on the cable of 480 MHz so even with the overhead of the USB protocol the 24.58mhz data transfer rate will not be a problem.

Where the cable bandwidth is important is that the link transfers data in short bursts carried at the 480mhz link speed so the cable needs to be good enough to accurately transmit the 480mhz carrier waveform.

Evidence is that there are a number of variables that go into making the transfer over USB run well, these appear to be linked to the accuracy of timing and electrical transmission and how effectively the data in at the receiving end can be clocked in. IMHO Cables are perhaps not the prime consideration but do have a role to play in getting the USB link to run well for music data.

Regards,

Nick.
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Audio PC

C621 motherboard, Xeon 40 thread CPU.

 w10 14393 RAM OS => XX V2.10 / adaptive mode / XX buffer 4096 / NOS USB driver v 1.02 buffer 16ms / Q1,2,3,4,5 = 10,-,1,1,1 / xQ1 =15 / unattended / SFS 0.69Mb / memory straight continuous / system clock 15.0ms / Threadprio RealTime / Playerprio Low / CPU scheme 3-5 / 16x Arc Prediction / Peak Extend off / Phase alignment off / Phase off  / XTweaks : Balanced Load 35 / Nervous Rate 10 (or15) / Cool when Idle n/a / Provide Stable Power 0 / Utilize Cores always 1 / Time Performance Index = Optimal / Time Stability  On =>  Lush USB cable => modified NOS1 USB DAC => no pre amp => Orelo active horn loudspeakers with modified bass channel DSPs.

Music server: X99, Xeon 28 thread PC.

System power two 3kva balanced tranformers with dedicated earth spur.
vrao
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« Reply #2 on: January 18, 2015, 08:17:36 am »
Hi Nick,
Interesting points you bring up!
This whole issue arose with the present USB cable, wherein I noticed data sync issues, and dynamic compression. I asked the maufacturer, and he mentioned it was good for only 196/24.

So to all who are looking into USB Cables, consider bandwidth as an important parameter.

The YFS cable is fine, and its tour will continue for now.

VJ
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PeterSt
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« Reply #3 on: January 18, 2015, 10:17:31 am »
49.152MHz (Mb/s). But then I am used to play stereo ...
yes
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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).
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*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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Nick
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« Reply #4 on: January 18, 2015, 11:20:43 pm »
Quote from: PeterSt on January 18, 2015, 10:17:31 am
49.152MHz (Mb/s). But then I am used to play stereo ...
yes

Lol, yes I forgot we have two ears and two channels.

Best regards,

Nick.
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Audio PC

C621 motherboard, Xeon 40 thread CPU.

 w10 14393 RAM OS => XX V2.10 / adaptive mode / XX buffer 4096 / NOS USB driver v 1.02 buffer 16ms / Q1,2,3,4,5 = 10,-,1,1,1 / xQ1 =15 / unattended / SFS 0.69Mb / memory straight continuous / system clock 15.0ms / Threadprio RealTime / Playerprio Low / CPU scheme 3-5 / 16x Arc Prediction / Peak Extend off / Phase alignment off / Phase off  / XTweaks : Balanced Load 35 / Nervous Rate 10 (or15) / Cool when Idle n/a / Provide Stable Power 0 / Utilize Cores always 1 / Time Performance Index = Optimal / Time Stability  On =>  Lush USB cable => modified NOS1 USB DAC => no pre amp => Orelo active horn loudspeakers with modified bass channel DSPs.

Music server: X99, Xeon 28 thread PC.

System power two 3kva balanced tranformers with dedicated earth spur.
vrao
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« Reply #5 on: January 21, 2015, 05:36:47 am »
So, this issue arouse because recently all the music was trasferred from a 4TB SSHD to a 6TB spinning disc (5400RMP). A lot of classical music was added to the drive, and was the primary genre for the ears in the last week or so!
Maybe it has to do with the HD data access? As Nick said, the new drive stresses the bandwidth in some fashion?

I'll have to take my words back, spinning is a tad bit better.

Regards,
VJ
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