That's not how it works. There is no characteristic of current flow called "resistance." The amplifier is literally saddled with a "load" when you attach a speaker, and the magnitude of that load (physical analogy: the mass of a rock you're expected to push and pull around) is the impedance. More ohms, more resistance (mass).If you push 8ohms out of your amp into a 4ohm speaker, you'll blow your output transformer WAY before your speaker.
If by "ohms" you mean the minimum impedance of the amp (or the labeled impedance on the amp) then yes, it is true with solid state amps.MY understanding has always been if the ohms are lower than the speaker you are fine. :lol: Whether this is true or not Im not 100% sure.