I use them on top of my B&K amps, which are stacked (with 2" spacers between the two amps, and this fan on top of the top amp's fins). With it, the top amp is cooler to the touch than the bottom amp.They are fairly cheap for the investment in the amp and they are thermally controlled for fan speed: https://smile.amazon.com/gp/product/B01LVUWOBX/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
So, when my Buckeye NC502MP works its way down the list to delivery, I'll be ready. But if I'm not having a heat problem with those B&K amps with their Class A predrivers, I doubt I'll have a problem with the NC502MP.
Rick "B&K amps consume and presumably radiate 60 watts when quiescent" Denney