Hum in the system

First try a cheater plug. Place on one component at a time and see what happens. Let me know the results and we'll then go to the next step.

I had a crackle in my system after I added a Rotel DAC and I finally narrowed it down to the digital interconnect. Some brands may not be compatible with all players or it may be defective. I put in a different brand cable and it fixed it right away. Also, check to be sure your cables are not in a "birds-nest" behind your cabinet. Piles of cables not run cleanly and neatly can lead to noise in more complex systems. But try the first posts recommendation first because it is most common fix (using non-grounded cheater plug).

If have cable box connect with TV & DVD. You need to but a MagicBox.($100 for cable box) I had same problem before. (only on some amp) E-mail me if need more info. tlc@gus.net

I HAD THE SAME PROBLEM LAST WEEK WHEN I ADDED SOME COMPONENTS TO MY SYSTEM. 9 OUT OF 10 TIMES, IT'S THE VIDEO THAT CAUSE THAT GROUND LOOP SOUND. FLOATING THE GROUND IS A EASIEST WAY, BUT NOT RECOMMENDED FOR HIGH CURRENT AMP. COULD CAUSE FIRE! THE MAGIC BOX IS THE BEST WAY TO GO. IT'S THE ONLY ONE THAT WORKS. $100 FROM MONDIAL. GOOD LUCK, ANDY

I had the same hum problem , i called Carol Nelson at MSB and Carol swaped a new dac with the problem dac and it fixed the hum problem . Carol is a very nice person and MSB stands behind their products . 650-747-0400 hope this helps .