cooling my Krell monoblocks

First, be careful aiming a fan at Any piece of gear. IF you are somehow interfering with the natural convection (hot air rising) currents that the heating of the piece causes, you could actually make it run hotter, or too hot.

Premium (read as HEAVY) power amps like the Krell should be able to take any power demands in stride. Especially when used in an open installation. The Krell 300 or 400 integrated is a possible exception. My brief exposure to one (the 400) showed it to run bigtime hot. For my confined rackspace, that was a deal breaker. The Stereophile test confirmed my impression when they remarked on the heat of the amp after the pre-conditioning period before bench measurements, Worse Case Scenario, to be sure.

How much are you asking of these amps? I don't see how you should be able to put a dent in 'em....... If they have not gone into thermal protection then there is probably nothing to worry about.

I believe there was a thread somewhere that some folks loosened the fin bolts a smidgeon and that fixed the clicking sound. I havn't tried it as I just live with it. My FPB300cx clicks only a tad bit and only on occasion so I just leave it alone.
-John

My 400Xi runs hot...even toasty in standby, but that is why is sits at the top of the rack, nothing hinders it.

I have had mono blocks that have run much hotter, but they like that tropical heat level, that's the way they were designed.

Besides...where am I going to put my cat?

All electronic lifetimes is lowered by heat.

The only thing I know of that really likes heat, is indeed, the Cat.

I had one sponteniously combust on me after it lay in front of a fireplace for a couple hours.

After having lived with Atmasphere MA-1s for a long time, I can sympathize with those of you who keep amps that require you to adjust your life in negative ways to live with them. (I used to spend time with women like that too.)

After many years, though, I did myself a favor and replaced them (the MA-1s, that is) with two Sunfire 600s (used) and hooked them up with Marigo Ultra 5 power cords. They generate no heat, I can leave them on all the time, and the sound is far superior.

So, my advice is to get rid of your life-impairing amps and find something else. You can do better, and you can live a happier, more normal life without them.