If your speakers are legitimately 96 dB sensitivity or close that is a good start. Equally important (Arguably more so) how easily driven are they? I’m referring to load impedance characteristics/phase angles. This aspect has a significant bearing on the success of using SET amplifiers.
Another important consideration is the quality of the amplifier’s output transformer and power supply. Fundamentally key factors. This is the very last area for cutting corners. Take your time and do some reading and research. SET and efficient easy to drive speakers can be stunningly good if done correctly.
Charles