I love AP speakers. Sounds like you may be talking about the original Virgos? If so, here’s what JA had to say about them in the “Measurements” section in that review…
The Audio Physic Virgo is a reasonably hard load for an amplifier to drive, as shown by its plots of impedance magnitude and phase against frequency (fig.1). Not only does the impedance drop below 4 ohms for pretty much the entire midrange, but the phase angle is also moderately high in the upper bass and low treble.
If this is the case I’d certainly try bi-amping as there’s no chance either amp in triode mode will drive them sufficiently unless you’re in a small room listening at low volumes, and even then it’s probably a big stretch. If you’ve got the amps just try it — it’s free and you’ve got nothing to lose and maybe a lot to gain.