I did some experiments and discover that if I separate computer from other things there is no noise (different electrical sockets).
I tried with grouning and without it, it does not influence.

how to explain the nature of this noise?
is it possible to use one socket for all gears including computer ?
how to connect them in this case ?

thanks!

one more question on motifxs outputs

there are 2 pairs : 1) main outputs L/R & 2) aux outputs L/R
is these ouputs are balanced or unbalanced ? I guess unbalanced…

actually I use TS jack-jack “pro snake TPI 3” cables (unbalanced) to connect them to monitors (OUTPUT => yamaha hs50m & AUX => t.amp S-75 II => auratones 5C).

would unbalanced sound better than balanced ?
in the both cases active and passive ?
- output => unbalanced => hs50m
- aux => unbalanced => t.amp => unbalanced => auratones

vitamusic - 05 December 2016 05:29 AM

I did some experiments and discover that if I separate computer from other things there is no noise (different electrical sockets).
I tried with grouning and without it, it does not influence.

how to explain the nature of this noise?
is it possible to use one socket for all gears including computer ?
how to connect them in this case ?

thanks!

Without knowing the exact configuration of the electrical service in your building, it’s not possible to determine what paths stray signals/currents might be taking. Since you found a connection that’s noise-free, you could use that, it’s your decision.

However, it’s still risky to run your gear without safety grounds, or at least ground fault circuit interruption. You might never have a problem, but it takes only one incident…

vitamusic - 05 December 2016 07:04 AM

one more question on motifxs outputs

there are 2 pairs : 1) main outputs L/R & 2) aux outputs L/R
is these ouputs are balanced or unbalanced ? I guess unbalanced…

actually I use TS jack-jack “pro snake TPI 3” cables (unbalanced) to connect them to monitors (OUTPUT => yamaha hs50m & AUX => t.amp S-75 II => auratones 5C).

would unbalanced sound better than balanced ?
in the both cases active and passive ?
- output => unbalanced => hs50m
- aux => unbalanced => t.amp => unbalanced => auratones

The XS line outputs are unbalanced, and cables with TS plugs are the correct type to use.

5pinDIN - 05 December 2016 10:18 AM

Without knowing the exact configuration of the electrical service in your building, it’s not possible to determine what paths stray signals/currents might be taking. Since you found a connection that’s noise-free, you could use that, it’s your decision.

However, it’s still risky to run your gear without safety grounds, or at least ground fault circuit interruption. You might never have a problem, but it takes only one incident…

I understood how it works in my building.
I have 5 cables: 3 phases, 1 neutral, and 1 grounding
only one of 3 phases has grounding

if I use all gears on the socket with grounding there is noise, but if I separate the audio gear (with grounding) from PC (without grounding) the noise disapears.
I guess it means that the PC injects some perturbations in the current.

If I used balanced connextions with other sound interface, does it solve the problem ?

Balanced connections have the advantage of rejecting common-mode noise/interference (to a reasonable degree). Assuming balanced outputs connecting to balanced inputs, and properly wired TRS or XLR cables, there’s less likelihood of noise - but it’s not guaranteed.