The Terk website is under construction, so this is the best I can do for a link to the Leapfrogs: http://www.terk.com/products.html#leapfrog. I got the simple LF-IRX, and it works like a charm.
I share your concern about overheating. When I had the entertainment center built (I did it when my kitchen cabinets were built), I had the cabinetmaker include vents high and low on both sides of the unit. My use is modest, too: 2-channel stereo only at modest levels for a fairly small listening area. So far, no problems, but for more demanding use I'm not sure if this stragegy would work as well.
