Amps on top?

I'm here for the audiophool reason 

On top isn't the point, having space and air for cooling is the big deal. If the amp is on top, it has the space and air for ventilation. 

Amps close to the ground,  even my GaN Monoblock's and they weigh nothing compared to my Class A power amps. 

Heat, weight and EMF coupling are your concerns with amps.

Hot air rises, so if in an enclosed space it’s probably best on top. If you have plenty of ventilation it doesn’t matter as much.

Then there’s the weight issue. If an earthquake or tipping over is at all a concern it should be on the bottom.

Lastly, that transformer (assuming a linear power supply) is going to put out a lot of EMF which can couple unexpectedly to other gear if too close to it. Don’t worry, you’ll 100% hear it if it happens. :) It’s not subtle.

In my case I use a 3 shelf Butcher Block Acoustics rack and have my amps on the middle, plenty stable, lots of ventilation.

If your amp is heavy and your rack is tall it really should go close to the ground.

I just had a new stereo stand fabricated by an off road truck builder I know.  Welded steel.  I bounced on top of it to verify it's rigidity.  I plan to put my new (larger) amp on top.  It is a tube amp and I want it to breathe.  Instead of shelves, I use planks that cross under each set of feet.   The amp is a tube amp and I want nothing above it. 

Under the main  amp I plan to put my center speaker and my power supply.

Under the left side (choke chassis) I plan to put my DAC.  Under the right side, I plan to put my streamer.  My external crossovers will be on the outboard ends.

Setting amps on the floor just makes them hard to deal with.  Mine will weigh 150 lbs in 3 chasses.

Jerry