What happens to an amp below 2 ohms?

Another way to look at it is to search for the few, underline few, amps that can comfortably and reliably,heavily underline reliably, drive the Apogee Scintilla which goes down to 1 ohm. Looking at those amps will tell you what is necessary for an amp to handle such a load.

Very few amps will handle such a load but I know of only 2 speakers myself that go below one ohm: the aforementioned Scintilla and the Quad 57. The latter does this in the top end so is not nearly as difficult a load to drive as the Apogee. In a perfect world the impedence curve would stay above 6 ohms but in our world some very good speakers have difficult curves. My Gamut L5s go down to 3.2 or so and my friends Sasha to below 3. The amount of work my CJ 350 has to do driving the Gamuts is considerable, gets quite hot driving them to a good volume in a long session. On the other hand it gets barely warm driving my Spendor S 100s to a similar volume. A good reason why you should always buy the speaker first; then you know what your amp requirements will be.

The Krell KSA and MDA are noted for playing the Apogee line of speakers with aplomb. In fact Krell put themselves on the map by building amps that could do this and were the amps of choice for Apogee to demo with. I'm not sure if some of the latter Krells could still do this but I'd be surprised if they couldn't.

The benefits that some speakers that have low impedance's provide, outweigh the disadvantages of that low impedance. Buy the speakers you like best, then buy an appropriate amp.

They blow up and make a mess!