26 May
2007
26 May
'07
4:36 p.m.
Am Freitag, 25. Mai 2007 schrieb Malte Steiner:
Arnold Krille wrote:
Okay, your laptop introduces a hum and you are using balanced cables?
The shielding around the balanced cable is there to (further) suppress noise
coming in. It has to be connected to earth somewhere and it is totally fine
if it is connected to earth only on one side of the cable. So you could
create a special (pair of) cable where the shielding is connected only on one
side. This is no security risk in any way! Its just one of the benefits of
balanced connections and similar to lifting ground in DI-boxes.
BTW: This doesn't work if the connected equipment is powered by phantom-power
over that cable because phantom-power is providing the voltage between the
signal-lines and the shielding. Disconnecting the shielding somewhere makes
phantom-power stop / get bad. So mark the "lifted" cable to not use it with
microphones. :-)
Or create only some small adaptors that lift ground on connections...
Arnold
--
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Am Dienstag, 22. Mai 2007 schrieb Malte Steiner:
No, I didnt express myself very clear :) , of
course they use and love
balanced cables. But it didnt helped anyway, the laptop introduces hum
there even with balanced cables and DI boxes etc... I got some success with balanced cables (and
balanced equipment of
course) but I know at least one studio which is resistant even for that
but maybe they got bad electricity anyway.
A studio not using balanced cables and
with bad power? Don't go there...