How to keep my stack of Adcoms cool...

Locate a squirrel cage or better yet axial (like a jet engine) in the crawlspace or a nearby closet. Put a small furnace type fiberglass filter over its intake so you are blowing fresh, clean air (clean filter regularly). Run the fan's output to your cabinet via insulated flex duct or similar (a good S-bend will cut noise out of the fan to the cabinet). Dump the air supply into the bottom of the cabinet. Cut ventilation into the top rear, a bit smaller than the area of the hose's crossection.

You'll end up with a slightly pressurized cabinet, this will help keep dust out- fringe benefit. You'll also get good, quiet airflow through the cabinet. Pull the shelves the amps are on and take a hole saw to them (don't put holes where the amps' feet go...) If there's no flow around the back of the other shelves, give them the old swiss cheese treatment as well- the air will move up with the convection currents and out of the cabinet.

Any "muffin fan" type fan you cabinet mount WILL make a racket, if not from it's own rattling, then from vibrating the back of your cabinet.

Eldartford-- A high-end amplifier company has gone the liquid cooled route. Unfortunately, it's CAR audio high end-- Precision Power used to make amps designed to be liquid cooled if you wanted, or convection cooled if not. Many a show car of that era had clear coolant lines with brightly colored coolant water color-coordinating with the paintjob,etc. It worked quite well.

Slappy- it might be more of a concern in Car audio based on the "mobile environment", but I can see home audio geeks, er I mean cool guys like us, really getting into it.

Hell, you could have an amp that was warmed up to operating temp by warm water and end that annoying 20 or more minutes you have to endure of less than perfect highs or grainy vocals when you get home from work. You'd switch on your amp with it already at a perfect temperature for optimum listening...

As the evening progressed, the system would convert to cooling the water. A simple Peltier device could both heat and cool the water as needed, and as controlled by a simple thermistor. With the size of amps nowadays, and the ton of "aesthetically pleasing empty space" many contain, you could put the whole sealed pre-heating / cooling system inside the box. Carefully designed, the water could circulate via convection currents and wouldn't even need a pump. How cool (pun intended) would that be?

I think Eldartford's onto something, and the resident rocket scientist is probably in his laboratory as we speak converting an amp to liquid temperature control.