Buzzing from speakers. Where is it coming from?

I'm sorry, I don't mean to mock anybody, but people go to incredible lengths to optimize and choose cables, connectors room treatments, racks and any of the hundred and one things affecting sound.
Some items are pretty...shall I say....esoteric? The differences in cables, some would say is pretty small while others call it titanic.
I'd say that any tweeter hiss is on the intolerable side.
A BUZZ from the tweeter? Shouldn't that be a HISS? I'd expect the BUZZ thru the woofer.

Start going thru the list by first disconnecting everything and if the hiss goes away, reconnect 1 item at a time till it returns.

This is the worst thing to track down. I'm betting on the Sat Box, which has lots of RF circuitry and are notorious for spewing it everywhere. My sat box is a good 3 or 4 feet from anything stereo related.

Ground loop. Usually cause by speakers. To test disconnect speakers from amp. Turn on amp if no hiss it is the speakers. If it hisses IT IS THE AMP. My bet is to get a high quality outlet like a Levitron or Hubbell 20 amp(set you back $8 for a double outlet) and this will cure the problem. Houses put 89 cent outlets on houses these days.If not disconnect everything and introduce one componet at a time. USUALLY these are caused by subwoofers

Vern,
I don't understand? Disconnect speakers from amp and listen for noise! Good trick.

I'll agree with one thing, which I hope is what you MEANT, if not said.

disconnect everything but speakers to amp. Even the interconnects. If the hiss disappears, start adding stuff back one component at a time. You have to go at this systematically to find the culprit. Process of elimination may be tedious, but it should yield a result.

No 'usual' cause. It is what it is. maybe the sub, maybe the sat dish. Maybe the neighbors microwave! (kidding on last)

Do you have an outlet tester? Use it. cheap check.
Don't lift grounds. Find the hiss-maker, first.

I will try disconnecting the interconnects this weekend and report my findings.

So I think I know where the buzzing is coming from. I first started to disconnect the RCA's to the MAC. Dead silent. So buzz is not coming from the amp. Second, I reconnected the RCA's to the MAC and then unplugged the Pionner receiver from the Monster line conditioner. Plugged the receiver into the wall outlet and got a hissing instead of the buzzing. I believe the "hissing" is normal. So replugged the receiver back into the line conditioner and again got the buzzing. I also noted that I could hear an electronic buzzing comining directly from the conditioner. So it must be it. Does this sound reasonable to you guys?