On Sat, 3 Apr 2010 17:48:43 -0400 (EDT) Rick Green <rtg@xxxxxxxxx> wrote: > I'm using a FOcusrite Saffire pro 26 I/O with ffado, jack, and Ardour to > make multitrack recordings of live concerts, to my emachines M6810 laptop > running ubuntustudio. I'm plagued by noise that sounds to me like RF > interference from the laptop, getting into the audio portions of the > interface. It's most obvious when I'm at home trying to mix down my > recordings, as its almost constant in my monitors and most noticable in > a quiet room, but it also manifests itself sometimes during shows, showing > up on the input lines to the interface, which are plugged 'half-way' into > the FOH mixer's channel inserts, so it invades the PA and the performers' > monitors. WHen that happens, I've no other choice but to abandon the > recording and shut down the laptop. > > Has anyone else encountered this problem? Got any suggestions how to > filter it? I'm going to try some ferrite cores snapped around the > firewire cable first. Anything else I might try? First question, is the laptop running from it's battery or the mains? If battery, how good is it's charge retention? If mains, is it a fully isolated PSU or is there a possible earth loop? Note some PSUs are really nasty and have filtering caps that bridge across L N & E Do you get the same problem if you go via any route *other* than firewire? I don't know about laptops, but I've learned to avoid emachines desktop machines like the plague. They are the crappiest build imaginable :( -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
