How important is EMI and RFI rejection?


In designing a cable....and what cable manufactuer(s) excell...

Power cords
IC's
Speaker cables
wavetrader
So too get a grasp on what we are actually talking about performing here… Please explain what your doing to mod your grounding scheme? It seems that basically the explanations above is going into each component of the system and actually disconnecting the IEC ground pin and then straping a new ground via wire or braided strap to the chassis (similar to a phono stage to a cartridge in a turntable) and then bringing them all directly to a single ground via example connecting them all to one open outlet on your wall gaining a single star ground to earth (of course only using the ground pin on that outlet maybe using an old 3 prong plug but taking care to make sure hot and neutral are paralyzed and not used accept for the pins to mechanically help plug it to the wall) ?

Here is my question, is not the ground collars on all the RCA jacks and PIN #1 on an XLR connecting components to each other already giving a common ground back to each component? And would this not be the same Chassis ground already simply putting you in a position to just make One single ground strap to connect back to an earth ground at a single outlet after removing the ground from all IEC's?

Also I don't really understand the whole "Floating ground" concept with or without capacitors accept floating ground normally means simply removing ground from a component causing a hum in the system.

If someone can please specifically explain what steps are taken to try and get this same negative ground voltage matched up to all components, I understand the Star ground etc… And it would seem you do have to make sure each component would be isolated from having a second ground hooked up thru your various power cables going to different outlets which normally has the 3 ground pin connected via the cable to the wall, however would it not be a better idea to just making sure ONE of the power cables in the system has the ground attached to its IEC and just connect all other components chassis to that one Chassis with an IEC earth ground already connected?

But from my understanding the whole system including the amp is still common grounded because all the interconnects still give it a common ground, and if the amp was to surge or something it would simply ground itself thru the preamps RCA's which are of course hooked to the chassis ground which is still hooked to earth ground at the outlet etc…

Anyway please explain the professional way to go about it, and also is there anyway to test for this hum with a type of voltage differential test or something between components with a basic multimeter or something?

Thanks
If you cross power cables and audio cables at 90 degrees and keep power cables 4 to 6 inches away from each other you should have few problems.

As far as I know the only way to stop EMI considering it is EMF causing the problem is to use shielded cables and ground at only 1 end, preferably to the wall outlet screw not your equipment.
I don't want my to amplify any signals other than the pure music. I wonder if the expensive MIT speaker cables allow RFI & EMI to contaminate the signal from the amplifier to the speakers?