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XXHighEnd > Ultimate Audio Playback > Chatter and forum related stuff > Mains 'vibrations'
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Chris V
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« on: October 25, 2015, 09:04:56 am »
Some bits of Hi Fi kit, once plugged in the mains, have a tiny vibration/hum in the casing. It's not transformers vibrating but it almost seems as if the casing is 'alive' particularly when touched very softly with the hand.

I'm sure its not a safety issue as this occurs on new kit.

What's occurring here and is there an impact on sound quality?
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Music on external hard drive with own power supply. Brains of the system is a Raspberry Pi running Moode Audio. The RPI has dedicated Longdog audio linear power supply.
Signal passes first to SW1X Signature USB to SPDIF  converter
Then to SW1X Signature DAC
Then to Stevens and Billington TVC
Then to modified vintage triode amplifier
Then to open baffle speakers with vintage alnico drivers. Grundig tweeter, Saba Greencone midrange, Altec 416 VOTT base.
Everything is silver wired including mains and speaker cables
PeterSt
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« Reply #1 on: October 25, 2015, 10:38:46 am »
Chris,

What you feel there is current. Or maybe I could say : the "charge" the chassis received.
Not good for SQ at all.

Unplug all your interlinks and other inter-device connections, have them powered on, and measure the voltage between the various chassis'.

Try to have the voltage (the potential difference) to be the least in all situations.
Most often this is a case of twisting the plug 180 degrees - something we can do over here. You can do it too, but you must make your own plugs and sockets.
Otherwise try all the combinations with - and without mains earth. Again something you can't do easily but this time it needs a modded (extension) socket only. Have a larger one, and cut the mains earth from half od the sockets. Now you can play around.

Regards and have fun (ahum),
Peter
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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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Chris V
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« Reply #2 on: October 25, 2015, 07:02:15 pm »
Quote from: PeterSt on October 25, 2015, 10:38:46 am
Chris,

What you feel there is current. Or maybe I could say : the "charge" the chassis received.
Not good for SQ at all.

Unplug all your interlinks and other inter-device connections, have them powered on, and measure the voltage between the various chassis'.

Try to have the voltage (the potential difference) to be the least in all situations.
Most often this is a case of twisting the plug 180 degrees - something we can do over here. You can do it too, but you must make your own plugs and sockets.
Otherwise try all the combinations with - and without mains earth. Again something you can't do easily but this time it needs a modded (extension) socket only. Have a larger one, and cut the mains earth from half od the sockets. Now you can play around.

Regards and have fun (ahum),
Peter



Thanks Peter, when you say twisting the plug 180 deg do you mean (for us in the UK) swapping live and neutral?

Sound like a good job for a wet afternoon.  Wink
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Music on external hard drive with own power supply. Brains of the system is a Raspberry Pi running Moode Audio. The RPI has dedicated Longdog audio linear power supply.
Signal passes first to SW1X Signature USB to SPDIF  converter
Then to SW1X Signature DAC
Then to Stevens and Billington TVC
Then to modified vintage triode amplifier
Then to open baffle speakers with vintage alnico drivers. Grundig tweeter, Saba Greencone midrange, Altec 416 VOTT base.
Everything is silver wired including mains and speaker cables
PeterSt
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Posts: 16837



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« Reply #3 on: October 25, 2015, 07:08:00 pm »
Yep Chris. And I now realize that our 180 degrees is quite obvious with two opposite pins. Not so with an uneven triangle ...

haha

Peter
Logged
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.
Global Moderator
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