1 Topic by V.Ivanov (edited by V.Ivanov 2012-11-23 16:12:37)

  • Registered: 2012-09-27
  • Posts: 8

Topic: Noise problems with the grounding

Hello again. I'm using 2x HDSP Multiface II with a 16channel soundcraft mixing console. I'm having some noise on each of the channels which is pretty inaudible when you listen to only one channel at once, but it gets rather nasty when I mix down 11channels together.  I'll try to describe my signal chain:

console's preamp -> taken out through insert point on console via Y-type wire (send, return, ground) -> neutrik NYS-SPP-L1 patchbay(every single section is grounded) -> MF's analog input -> VST host(steinberg nuendo) -> MF's analog output -> patchbay(every single section is grounded) -> returned to the console via Y-type wire -> console main mix.

Noise appears right after the DA converters of the MFs.

The noise I'm talking about is said to be caused by ground loops. I tried connecting every device's housing into a grounding chain using a simple wire in a following order:

console - patchbay - 2xMFaces - my hosting computer - ground

Needless to say that every device in that chain is 100% grounded individually via factory-implemented grounding solutions.

The problem still persists.

I'm sorry for my worst english.

2 Reply by S-E Hansson (edited by S-E Hansson 2012-11-23 17:16:45)

  • From: Gothenburg, Sweden
  • Registered: 2007-05-01
  • Posts: 441

Re: Noise problems with the grounding

Hi,

Not enough to just ground the console and the computer/HDSP
to same electric power supply/ground and use audio cables XLR-XLR and TRS-XLR ?
or perhaps you need to break the ground somewhere in the chain but this is not recommended
for safety reasons.

regards S-EH

3 Reply by V.Ivanov (edited by V.Ivanov 2012-11-23 18:12:17)

  • Registered: 2012-09-27
  • Posts: 8

Re: Noise problems with the grounding

S-E Hansson wrote:

Hi,

Not enough to just ground the console and the computer/HDSP
to same electric power supply/ground and use audio cables XLR-XLR and TRS-XLR ?
or perhaps you need to break the ground somewhere in the chain but this is not recommended
for safety reasons.

regards S-EH

Thank you for your reply. The connection I use is a standart Y-type insert cable. It has a single TRS plug on one end and 2xTS plugs on the other end.

The trs end scheme is:
tip - send
ring - return
sleeve - grnd

The first ts is:
tip - send
sleeve - grnd

The second ts is:
tip - return
sleeve - grnd

I'm now thinking that I could try grounding the copper housing of the wire separatelly. This will prevent that current from flowing between two electrically unequalized potentials, I suppose, but am not sure enough to attempt this.

Help is much appriciated.

  • Registered: 2012-09-27
  • Posts: 8

Re: Noise problems with the grounding

Bump.