They are listed at 3 ohms, but I'd bet pretty confidently that they'll actually remain above 4 ohms most of the time. Those wouldn't cause any problems to the amp, and they're rated at 125 RMS, so it sounds like a pretty good match, to me. If they did indeed remain below 4 ohms, you might get slightly over 150 out of the amp. But the old a/d/s/ were notable for build quality and sound quality, not for being underrated. They do their rated power, and perhaps a slight bit more.
But I won't go to the extreme of so many people on this board who claim their amps are "VERY underrated", but have never benched them to back it up. Old school a/d/s/ quality speaks for itself.
I'll be very happy to keep and use this amp to run coaxials in my wife's Taurus someday if no one wants it. I'll prolly sandblast the heatsink just to clean it up a bit first, but that's it.