You may have a ground loop. They are very difficult to break without loosing a ground on something. If your mixer has balanced inputs it might be easier. I have a 12 x 4 channel mixer, an 8 track digital recorder, sound module, signal processor, and monitor amplifier, all hooked together and to my computer. Only one computer though. It took a lot of making special patch cords to get all the hum and other interference out of the system. Do you live near a TV transmitter? I do and that was a problem too.
Regards. Max. K 4 O D S. Email: [email protected] Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with tubes group send an email to, [email protected] ----- Original Message ----- From: "Scott Howell" <[email protected]> To: <[email protected]> Sent: Monday, March 02, 2009 4:44 PM Subject: [BlindHandyMan] question on interference form computers > Hey folks, I have a rather interesting problem that I hope is > acceptable for the list. Let me explain my setup and then I'll explain > the problem. > > I have a small mixer that has three or so inputs. I have my employer's > Dell laptop, my Macintosh, and a cable into which I plug my electric > bass. All this is served by one pair of headphones. Now in order to > save on space and so forth, I have a usb KVM switch. servicing both > computers. THis KVM only handles a keyboard and mouse, but you could > connect video, which I do not. So, when I have the Mac and PC laptop > connected and running, everything is fine. If I shut the laptop lid/ > put it to sleep, but leave it connected, I get this humming noise that > is not 60Mhz, but probably almost twice that. I can disconnect the > laptop and then soud goes away or if I adjust the mixer controls just > so, I can cancel out the sound. For some reason it sometimes gets > messed up and that usually is because I have made a slight adjustment > to something and then I have to start all over again isulating the > sound by tweaking things. So, has anyone have any thoughts on how I > might correct this problem, so I do not have to keeep messing with the > controls? It could be the mixer, but I suspect there is an issue with > both machines being connected to the KVM and this is a pretty cheap > KVM. The KVM is not near the computers, it is under my desk. > > Thanks, > > > > ------------------------------------ > > Send any questions regarding list management to: > [email protected] > To listen to the show archives go to link > http://www.acbradio.org/pweb/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=33&MMN_position=47:29 > Or > ftp://ftp.acbradio.org/acbradio-archives/handyman/ > > The Pod Cast address for the Blind Handy Man Show is. > http://www.acbradio.org/news/xml/podcast.php?pgm=saturday > > Visit The Blind Handy Man Files Page To Review Contributions From Various > List Members At The Following address: > http://www.jaws-users.com/JAWS/handyman/ > > Visit the archives page at the following address > http://www.mail-archive.com/[email protected]/ > > If you would like to join the JAWS Users List, then visit the following > address for more information: > http://www.jaws-users.com/ > For a complete list of email commands pertaining to the Blind Handy Man > list just send a blank message to: > [email protected]! Groups Links > > > > >
