1 Topic by mertas (edited by mertas 2021-03-12 11:10:05)

  • Registered: 2016-04-10
  • Posts: 35

Topic: Crashes in Monitors

I.
using iMac with latest macOs and updated drivers + firmware on Fireface802

Every time I stand up from the desk I hear crash/slap/noice in monitors Tannoy Gold8.
I didnt have such problem for many years.  And in headphones there is no audible crash to be heard either now. and in second pair of monitors from QSC also no problem.

Custom made TRS cables are same for both monitor sets and instalation is stability without changes.

Is this problem caused with Fireface /damaged , too old...) or is this any static electricity problem?

How to fix it?

  • waedi
  • DAW Mastermind
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  • From: Swiss Zürich
  • Registered: 2020-12-08
  • Posts: 4,180

Re: Crashes in Monitors

Not easy, lot of questions.
Connection of the speakers, with ballanced cables ?
When you unplug the Fireface from the computer and leave it on (on power), is the noise still coming when you stand up ?
Where is the Fireface placed ? on the desk next to the computer or in a rack on another desk ?
Is there a carpet on the floor ?
Are you doing some kind of movements at the desk, rolling around with the chair ?
Can you see that noise in the computer Totalmix or Digicheck ?
can you record the noise with camera and give the link here ?
On the back of your monitors there is this switch for auto-standby, can you switch it off ?
Can you replace the power cables of these monitors ?

M1-Sequoia, Madiface Pro, Digiface USB, Babyface silver and blue
  • Marc S
  • RME Developer
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  • Registered: 2019-06-11
  • Posts: 110

Re: Crashes in Monitors

Do you by chance have a gas lift office chair? Have you tried replacing it with another one (fixed-height, i.e. just a normal chair)?

  • Registered: 2016-04-10
  • Posts: 35

Re: Crashes in Monitors

waedi wrote:

Not easy, lot of questions.
Connection of the speakers, with ballanced cables ?
YES

When you unplug the Fireface from the computer and leave it on (on power), is the noise still coming when you stand up ?
YES
Where is the Fireface placed ? on the desk next to the computer or in a rack on another desk ?
IN RACK
Is there a carpet on the floor ?
NO, BUT I TRIED WITH CARPET AND SAME CHAIR - but happens again. When changing from orange chair to basic chair - crashes stop  see photo https://www.dropbox.com/s/q976v3ezlxumu … 1.jpg?dl=0
WHY IT IS PROBLEMATIC WITCH ORANGE CHAIR?

Are you doing some kind of movements at the desk, rolling around with the chair ?
JUST TOUCHING WIRELESS KEYBOARD, MOUSE AND TRACPAD
Can you see that noise in the computer Totalmix or Digicheck ?
NO I DONT SEE ANYTHING IN TOTALMIX
can you record the noise with camera and give the link here ?
HERE IT IS - clicks/nois is on 2nd and 8th second https://www.dropbox.com/s/yocmvpkxbf0ch … s.m4a?dl=0

On the back of your monitors there is this switch for auto-standby, can you switch it off ?
IT IS AND IT WAS
Can you replace the power cables of these monitors ?

YES I CAN BUT ALL ARE SAME - CUSTOM MADE MOGAMI CABELS AND NOISE IS IDENTICAL IN BOTH MONITORS LEFT AND RIGHT

  • Registered: 2016-04-10
  • Posts: 35

Re: Crashes in Monitors

Marc S wrote:

Do you by chance have a gas lift office chair? Have you tried replacing it with another one (fixed-height, i.e. just a normal chair)?

SEE PHOTO OF MY PROFESIONAL SITAG CHAIR WITH GAS LIFT
https://www.dropbox.com/s/q976v3ezlxumu … 1.jpg?dl=0

YOU ARE RIGHT, When changing from orange chair to basic chair - crashes stop!!!!!!

WHY IT IS PROBLEMATIC WITCH ORANGE CHAIR?
eventhought I put carpet below chair or put joga 10mm thick matte... still crashes...

And why second pair of monitors far from the desk is not having the same issue?
Some photos of monitors and how isolated are stands from the ground here:
https://www.dropbox.com/s/7hu6xk9o99feo … 5.jpg?dl=0
https://www.dropbox.com/s/1rp04df52k6q1 … 4.jpg?dl=0


Any idea, how can I come back to my orange sitag chair?
PS: With Yamaha HS80 monitores it worked for years....

  • Marc S
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  • Registered: 2019-06-11
  • Posts: 110

Re: Crashes in Monitors

Here is a white paper with background information: http://www.emcesd.com/pdf/eos93.pdf

...and a link to a casual discussion: https://www.reddit.com/r/pcmasterrace/c … rning_our/

Basically, the gas lift in combination with the metal legs leads to a spike in electromagnetic emission.

Did you have the Tannoy Gold8 before, or are they new?
Same cabling as before? Same power socket?

Every cable in the system, even how every cable runs in the room, could be the root cause, as they work as an antenna and potentially receive the electromagnetic pulse. Ferrite rings might help, but you'd have to identify where to put them first...

Btw, you did check, that the cable is properly balanced, did you?

  • Registered: 2016-04-10
  • Posts: 35

Re: Crashes in Monitors

Tannoys are new in my system (replaced Yamaha HS80 after many years).
All the rest remained the same - socket, balanced cables...

Thanks for all interesting information!
I will try to identify spot...

  • cyrano
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  • From: Belgium
  • Registered: 2015-04-28
  • Posts: 701

Re: Crashes in Monitors

Probably the Tannoy Gold 8 has a grounding problem, preventing the electrostatic discharge from the gas shock to flow to earth.

You can try with an extra wire from the Tannoy's shield at the inputs to mains ground, if there is a working one.

Problems like this often disappear miraculously when the weather is wet. I don't mean a bit of moisture in the air, but heavy rain for a few days at least.

Your ground connection could be in a sandy soil. When sand is dry, it's an almost perfect isolator...

MB Pro - 2 X FireFace 400, FF800 & DigiFace USB
ADAT gear: Korg, Behri, Fostex, Alesis...

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