I had the same problem with my ReQuests.What you're probably seeing is a common ground loop. This occurs because of of all the grounds (e.g., the grounding pin on the power cords) on your equipment and the interaction with the shielding on the interconnects (grounds also). The most common solution is to use a 'cheater plug' (the small three-prong to two-prong devices)on the power cord of one component in you system. Experiment to see which component/power cord is the culprit.I actually had to use two on my system and it is absolutely quiet. Someone on another chat request suggests starting with the amp; I've also seen others suggest doing the experiment to identify the offending component. Remember though, you will be lifting the ground (Safety) from that component. That said, it is a fairly common problem and a fairly simple fix.
Audible Hum
I just hooked up a pair of Clayton M70 monoblocks to my Martin Logan Requests. There is now an audible hum coming from the speakers when the volume is off. The amps are located close to the speakers.Is this the problem? I am new at this and would like the groups help. I did not have this problem with my B&K amp which I replaced.