Several different things going on here all being conflated and confused and rolled into one. Fields are a whole thing and I rather doubt you are going to wrap each component in a Faraday cage. So what you need to know, it depends greatly on the component.
Phono stages are most susceptible. Because of the incredible gain even the tiniest noise becomes obvious and annoying. With power amps, the line level coming in is a thousand times greater and so it matters much less.
But with amps it still matters what we're talking about. Sub amps are pretty much immune. Not because of the amp but because of our hearing. We just don't notice nearly as much. Everything up from there however vibration control is huge.
Yes you can stack amps. My system is a good example. Notice the sub amps are stacked, they never get hot and with them it does not matter. My integrated amp however has massive vibration control- granite, BDR, and Townshend Pods. Notice my phono stage is isolated with massive rack, BDR and Townshend Pods, as well as being physically isolated by distance from electromagnetic fields. https://systems.audiogon.com/systems/8367
Your best solution is Townshend Pods under every component. Since you are doing multi-channel then you are talking home theater and it is hard to see why it matters, HT being a wasteland of bad sound. Stack the sub, surround, and center channel, and put the stereo amps on Pods. This will help a lot. But honestly, if you really are concerned with sound quality the answer is fewer amps and channels.
Phono stages are most susceptible. Because of the incredible gain even the tiniest noise becomes obvious and annoying. With power amps, the line level coming in is a thousand times greater and so it matters much less.
But with amps it still matters what we're talking about. Sub amps are pretty much immune. Not because of the amp but because of our hearing. We just don't notice nearly as much. Everything up from there however vibration control is huge.
Yes you can stack amps. My system is a good example. Notice the sub amps are stacked, they never get hot and with them it does not matter. My integrated amp however has massive vibration control- granite, BDR, and Townshend Pods. Notice my phono stage is isolated with massive rack, BDR and Townshend Pods, as well as being physically isolated by distance from electromagnetic fields. https://systems.audiogon.com/systems/8367
Your best solution is Townshend Pods under every component. Since you are doing multi-channel then you are talking home theater and it is hard to see why it matters, HT being a wasteland of bad sound. Stack the sub, surround, and center channel, and put the stereo amps on Pods. This will help a lot. But honestly, if you really are concerned with sound quality the answer is fewer amps and channels.