If for some strange reason you absolutely must run an ultra-low load (2 ohms or less) then you might want to check out a used amp from NAD. I say used because i) I have a few of their older models and I know them to be designed to handle those loads and ii) you can buy them cheap - in case you fry one of them .

However something like the NAD 2200 is pretty much bulletproof. The manufacturer actually rates it down to 2 ohms (800 W/ch dynamic power). Old reviews talk of taking it down to 1 ohm. In all extreme cases its protection circuits will kick in well before anything untowards happens.

As I said, if you must drive a very low impedence load, that's what I'd recommned.

Jeff Mackwood