On Sun, 2007-03-11 at 22:53 -0400, Martin Eckart 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?
hello martin
lifting the ground of the power-plug would solve the problem, though it isn't recommended and might be dangerous. better would be to galvanically isolate your FA-101 from the amplifiers. this could be done by transmitting the soundsignal over a transformator. there are DI-boxes around with a ground-lift button, which do exactly that. but you could also buy an appropriate trafo and solder the necessary plugs to it yourself.
roman
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