hum when connecting from MMV computer to amp

[Gary Schank]

When using the MMV live, I use an adapter to go from the computer output mini-stereo jack, into my amp with a standard 1/4 inch jack.  It creates a hum as though the output is too high, yet I have the computer output settings to low.  Has anyone experienced this, and how did you solve it?  Thanks.

[infinite9ths]

Hi Gary,
I know this is a little late to reply but I just joined.

What you have is a ground loop caused by different EMI potential between two or more relative grounds (your comuter/notebook and the mixer most likely). Sound cards tend to be 8-32 ohms where line inputes can be 47,000 ohms which obviously don't match. 60-cycle hum is the hum you're hearing as a result.

I had the same problem and found a product (DAK CS-1 for 29.95 plus 7 shipping) that is so simple it is rediculous. I go from a mini stereo jack from my Audigy into this little unit, into my Tascam SX-1 LE mixer/recorder and hear ZERO hum! I bought a second one for my Lambda Lexicon USB device that I use for mic input symultaniously into both the computer's USB and the Tascam as well. Cheap and extremely effective.

Check it out here: dak.com/reviews/2045story.cfm

Check out my mixes using this device and, of course, the MMV at infinite9ths.com

Best of luck to you!
Brad

[Gary Schank]

Thank you very much for that information.  I will get that unit, and also check out the URL you sent.