Hallo, alex dray hat gesagt: // alex dray wrote: > i think you're out of luck...the point of laptop architecture is to squish > everything together....with a monitor and usb (which is fairly high > voltage) so close to an integrated audio card, you cannot avoid magnetic > influence as shielding at this level is practically impossible....you're > best bet (and not a very good solution) is to get a breakout box so the > actual dac is physically outside the laptop. If you come up with better > solution please let me know,its a problem that frequently drives me nuts An external box won't necessarily help, because it will not break the ground loop, that is happening here. I have the same humming with a Quattro. There is only one solution: breaking up the ground loop. First one should try to disconnect everything that is connected to the amplifier except of course the laptop. I had my main PC connected to the same amp as my laptop and as soon as I disconnected the first, the loop was gone. If this doesn't help, then there is a ground loop between the amp an the laptop itself. Then you need to break the earth connection between the laptop and the amp (which is useless anyway) by using for example a direct input box with ground lift or the Monacor FGA-40 filter. One can also try to cut the earth of the laptop's powers supply if one has a death wish... ;) I mean, don't do that. I collect GroundLoop links on my Wiki: http://footils.org/cgi-bin/cms/pydiddy/GroundLoop ciao -- Frank Barknecht _ ______footils.org__
