Is grounding all my components together a good idea?

[trains are bad]

I've had this hum in my sumwoofer that's been just audible enough to drive me insane. I'm rewiring my whole setup into a more optimal configuration, and using some new wires while I'm at it. I have a stereo amp, a surround processor, DVD player, and powered subwoofer, all plugged into the same power bar. I also have a computer plugged into an outlet across the room, but I'm not hooking it up right now for scientific purposes.

What I thought I'd do is, run some plain wire between all my components' cases, and maybe then to the outlet cover screw. I thought that would be a great idea. But I was poking around and noticed that all my stereo gear is only 2-pronged plugs, which means that the cases aren't necessarily at earth ground, right? Plus, my turntable's little ground wire gets hooked to my stereo recever's 'earth ground' terminal screw. I'm not sure if my idea is a good one anymore. Could it hurt anything?

 

[majkel]

Ground just one component, the amplifier preferably. If you ground more then one component, you'll create a ground loop thru the grid in the wall. This is a bad thing because a part of returning music signal will flow through the grid cables.

Grounding more than one component by installing three-pin mains connectors is a common trick to make the power cords "sound", utilizing the ground loop side effect. Actually it'l like partial removal of a bad thing done, so you better keep your components 2-pin, and you can try using a single wire to connect the amplifier's enclousure to the ground pin in the mains outlet. A banana plug might help.