16 Aug
2014
16 Aug
'14
6:22 p.m.
On Sat, 2014-08-16 at 16:09 +0000, Fons Adriaensen wrote:
On Sat, Aug 16, 2014 at 09:30:51AM -0400, Gene Heskett
wrote:
A DI-box with ground lift does not interrupt safety ground.
It just ensures that there is no ground connection via the
audio path. Both items connected to it will (should) still
have their own safety ground.
Correct!
All
computers do that. Just put a DI-box with ground lift between your
audio interface and the speakers and the noise is gone.
Dennis
And get someone electrocuted. That doesn't happen on my watch because
they'll never get it plugged in, I would not allow it. There are several
ways to fix a noise inducing ground loop, but a ground lift adapter is not
one of them. Whether it will reduce interference from MIDI in a
sound
card is questionable.
I guess it wont reduce this kind of noise.
MIDI is isolated anyway. If anything of it leaks into
the analog
audio path that means the sound card has a problem.
Increase the volume and you will hear digital noise from the analog IOs
of a card inside of the computer. Move the mouse and extra noise will be
audible, no MIDI is needed to get annoying noise. MIDI noise is very
silent compared to mouse noise, but there is some noise.