So I've had a couple weeks to play around with my new Rubicon 1.400. I was originally leaning towards a class D because after reading up, they tend to run cooler and are more compact.
When I found the Rubicon online for $99 shipped I took the bait even though it's an A/B. I was a bit concerned after reading reviews about this model getting hot. I decided for that price I'd give it a go and hope for the best.
I fabbed up a wood shelf and under mounted it to the rear deck with steel brackets I made to keep it out of the way. Once again i worried about heat being trapped under there but decided to see how it does. I decided I could always install a fan if there was a problem
I'm driving an Infinity 1262W wired for 2 ohms and 300 watts RMS. Figured 400 watts RMS from the amp would give me a little headroom.
After playing around with it for a couple of weeks, I found a spot in the gain just where the hum dies off. Right now it sounds about perfect. I've run it for 2-3 hours straight and pushed it hard once the sub was broken in. The amp never gets real hot.
It's very clean and has plenty of output for my purposes. The gain knob could have better indexing and that's my only complaint. Killer amp for the money.