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This is obviously a grounding issue. Does the 0404USB have a screw where you can attach a wire to ground it? Then you just need to connect it with a wire to the same ground as your amp (ground to the amp or to the ground at the wall plug, same thing, take care for safety obviously).
A grounding issue would cause hum, not beeping noises. That sounds like the amp is just picking up the internal noises from the laptop, like the hard drive spinning and such.
Using a digital connection through USB would eliminate that, yes.
A grounding issue would cause hum, not beeping noises. That sounds like the amp is just picking up the internal noises from the laptop, like the hard drive spinning and such.
Using a digital connection through USB would eliminate that, yes.
A ground loop will give 50/60hz hum but that is only one specific type of grounding problem. This grounding problem here results from the ground in the laptop given to the sound card being different from the mains ground. (Not two different stable mains grounds as in a ground loop.) It is a very common problem and produces beeping and other noises from computer activity often more or less independently of amp volume.
(It is possible for power instability in the computer, without ground differences, to cause activity-related noise too; in older bad integrated audio this was very obvious. However good sound cards e.g. E-MU cards have filters that eliminate this; that is why they can measure so well.)
Don't forget the M-audio Transit, which is a classic and respected USB-optical converter. It's also a bit cheaper than most of the other options mentioned.
Definitely ground loop. Just lift the ground on your amp with two prong adapter and it'll go away. The simplest and the most effective way to fix that.
Definitely ground loop. Just lift the ground on your amp with two prong adapter and it'll go away. The simplest and the most effective way to fix that.
The only other effective ground loop battling solution are ground loop isolators, but they seem to negatively affect sound. (check xitel side, they sell some)
If you know of anything else please do us a favor and post here. Thanks.
Linear Mode
