DR, welcome. Although the 7002 probably couldn't pass the FTC tests for an official rating at 4 ohms(5 continuous minutes at the full rated power into 4 ohms)without shutting down, it's highly unlikely that in real-world home use at sensible and safe listening levels that there would be any difficulty. This is particularly true with respect to the M80, since over a majority of its frequency range it could be rated at 8 ohms and less heat would be generated during operation in those frequencies.

-----------------------------------

Enjoy the music, not the equipment.