If you can get hold of a transformer PSU for your laptop that is a very reliable solution. It's not really a question of ground "loops", so much as switched mode power blocks tend to float at up to 80 volts above ground, especially the cheap ones. They throw off horrible little spikes at 100Hz where the triac cuts each cycle and those propagate everywhere. Another fix might be to power the Edirol from its own transformer instead of using USB to power it, then make a USB cable that is data only, no power.
On Sun, 11 Mar 2007 22:53:12 -0400 Martin Eckart imartron@gmail.com wrote:
Hi all,
I've had an annoying hum coming from my edirol FA-101 when I hook it up to PA systems and have finally figured out that it occurs only when my laptop is plugged in and not running on batteries. The FA-101 is also plugged in (boo 4-pin 1394 connections...) and then the amps I run into are also 3-pin plugs and leads me to believe that this is probably a ground loop issue. Can anyone suggest possible solutions? Is there a power bar that isolates grounds?
-martin
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