Your Mytec below measured by Stereophile, could even get it up into 2ohms at all.
Stereophiles JA’s summation, "practical use with speakers whose impedance doesn’t drop below 3 ohms."
No good at all with the OP’s speakers we are talking about here.
245W into 8 ohms
315Wpc into 4 ohms
when I tried to measure the clipping power into 2 ohms, the Mytek went into protection mode at 310W (18.9dBW),