What I’ve learned lately on this thread is to avoid using speakers that present loads to the amp of less than 2 ohms.What can be the case, is these speakers can be the best measured/sounding ones, why drive them with amps that can’t do them justice.
As for flipping the bird to amp manufacturers, only when it’s warranted because of not saying how it is, or recommenders of them that have no idea what they’re on about.
Because they the manufacturers/recommenders would have "you" believe if an amp with 800w can drive a speaker that’s "inefficient" and with a "average impedance loading". Then that same amp can also drive a speakers that are "even more efficient" but with a "very hard impedance loading".