C
cvenaccio
New member
I need help diagnosing a problem. I am using the M-Audio Onmistudio as a mixer for my synths. I have an Alesis QS7.1 and an Access Virus A. The Virus and Alesis are hooked up to the stereo inputs on the back of the Omnistudio via insert cables (Y-connector, 2 mono 0.25 inch to stereo 0.25 inch). The monitor out jacks plug into a stereo amplifier (Denon AVR-2600). I am getting the most God-awful feedback/ground/hum thing from the connection between the Alesis and the Omnistudio. There is no issue with the Virus.
At first I thought it might be the insert cable, so I switched the insert cables between the Alesis and the Virus and I still get the hum from the Alesis and the Virus is still fine. I even tried a single mono-mono cable and it hums.
I thought it might be a bad stereo in on the Omnistudio, but the Alesis hums on each of the 4 stereo inputs on the Omnistudio.
I then thought it might be the L/R out jacks on the Alesis, but I get no hum when I connect the Alesis directly to the amp.
I thought it might be a bad wall outlet, but I get the hum when I switch outlets.
I thought it might be the power cord, but get a hum after I switched that.
Both synths are about 2 feet from the Omnistudio and about 1 foot from the PC I am using for sequencing. I moved the Alesis so the PC and Omnistudio were 5 feet away and I still get a hum.
I've run out of ideas. I can't diagnose the issue. If there's a grounding issue with the Alesis, why don't I get a hum when I connect directly to the amp?
At first I thought it might be the insert cable, so I switched the insert cables between the Alesis and the Virus and I still get the hum from the Alesis and the Virus is still fine. I even tried a single mono-mono cable and it hums.
I thought it might be a bad stereo in on the Omnistudio, but the Alesis hums on each of the 4 stereo inputs on the Omnistudio.
I then thought it might be the L/R out jacks on the Alesis, but I get no hum when I connect the Alesis directly to the amp.
I thought it might be a bad wall outlet, but I get the hum when I switch outlets.
I thought it might be the power cord, but get a hum after I switched that.
Both synths are about 2 feet from the Omnistudio and about 1 foot from the PC I am using for sequencing. I moved the Alesis so the PC and Omnistudio were 5 feet away and I still get a hum.
I've run out of ideas. I can't diagnose the issue. If there's a grounding issue with the Alesis, why don't I get a hum when I connect directly to the amp?