I think you can use one of the screws on the components case; just loosen it and wrap a wire around the screw and run the other end to the lug on your power conditioner. Components are grounded to their case so I imagine this is all that is necessary.

Ritz, yea, it's not the APC, but it's also not the cable because I removed them completely and not effect.

The buzz is in a high frequency range but goes away if I remove the ground... I'll try running a heavy wire from Pre-Amp-Power Dist center.

i did exacty thAT.last winter,to avoid static.strapped 1050(no ground lug) to amp.

OK, so I ran the following ground wires to the commond ground on the power distribution center:

From 990 to common ground.
From 7700 to common ground.

Result, I can now remove the cheater from the amp. It removed 85% of the noise that I was hearing and I have to jam my ear to the speaker to hear any. Good enough for govenment work in my book.

Thanks for the suggestions!

I wonder what would happen if you grounded ALL of your components to that common ground lug Jester? Maybe a project for a rainy day?

I am glad that you have removed the majority of the hum, I guess those ground lugs do serve a purpose after all!

Jester,

I am curious if you would get the same results just grounding the 990 to the common ground plug on the power distribution center (PDC) and not grounding the 7700 to the PDC. My guess is "yes" as the 7700 has three prongs that connect to the power cable while the 990 only has two. I think you should be able to remove the one from the 7700 and elicit the same results.

Zo, the head scratcher is that it's not a hum in the low end, rather a buzz in the high end. I have Rocket RS1000's and its coming from the very top speaker in the array.

Doug your probably right. Thing is that the 990 is plugged into the power distribution center, and the Amp is not, rather to the wall with a surge block between the outlet and the plug. Since I was at it I figured why the hell not, ya know...

I think ALL components would need to be grounded to the same Lug as a Ground Loop is caused by components using seperate ground paths and the Amp is plugged into it's own wall plug; is this plug on the same circut as the one the rest of your components are plugged into? Here is a little background info on Ground Loops:


Ground loop is a condition where an unintended connection to ground is made through an interfering electrical conductor. Generally ground loop connection exists when an electrical system is connected through more than one way to the electrical ground.

When two or more devices are connected to a common ground through different paths, a ground loop occurs. Currents flow through these multiple paths and develop voltages which can cause damage, noise or 50Hz/60Hz hum in audio or video equipment. To prevent ground loops, all signal grounds need to go to one common point and when two grounding points cannot be avoided, one side must isolate the signal and grounds from the other.