Luxman 590axii ventilation

Yes, I've had good luck with an Infinity fan on my Parasound Halo five channel amp. The fans are very quiet. 

Infinity also makes top and front exhaust fans.

I own the L-590. An inch isn't enough, in my opinion. I have 2" above mine, plus open sides, front, and back. I'd like to have more space above it. It doesn't get hot, but more free air would be better.

Don’t forget that the bottom of the shelf above will not be neutral, it will also heat up reflecting its heat down towards the amp.  If you were set on doing it you would probably want a fan of some sort blowing across the top of the amp discharging the heat to the front or back of your cabinet.

Just an opinion, but the manual for the parasound A21+ I had recently recommended 6" all around and it was only around 12 watts (guesstimate, I don’t remember) in class A before switching to AB.

A beautiful piece of gear like that should be sitting proudly on top of the top shelf.  Is it possible to move the center channel?

I’d love it to sit on top, but the TV sits on the cabinet. I think these fans could work though. I could redo the shelves to give myself 2-3” above, then mount one of these slim exhaust fans on the back of the cabinet.

https://www.acinfinity.com/component-cooling/rack-fan-systems/cloudplate-t1-quiet-rack-cooling-fan-s...