The PM14S1 is only 20 wpc more than a Pearl Lite but that is into 8 ohms. It is 40 wpc more into 4 ohms and this is the number that really counts.
I have a PM15S2 that has the same output specs as the 14 and drive a pair of Dynaudio Focus 260’s that are true 4 ohm speakers with sensitivity of only 87db, most likely a more difficult load than your Harbeths. My listening room is 13 x 18’ and I have no problems with this combo. I don’t think you would either with the PM14S1. In short, I love this amp. Being built at the Marantz reference factory in Japan, it's build quality is heirloom.
The class D Nova would not be for me despite its higher output. Count me one of those that prefers the warmer sound of class A/B. But suggest you audition to find out for yourself. And if not to your liking, you know that the PM14S1 can certainly get the job done.
I have a PM15S2 that has the same output specs as the 14 and drive a pair of Dynaudio Focus 260’s that are true 4 ohm speakers with sensitivity of only 87db, most likely a more difficult load than your Harbeths. My listening room is 13 x 18’ and I have no problems with this combo. I don’t think you would either with the PM14S1. In short, I love this amp. Being built at the Marantz reference factory in Japan, it's build quality is heirloom.
The class D Nova would not be for me despite its higher output. Count me one of those that prefers the warmer sound of class A/B. But suggest you audition to find out for yourself. And if not to your liking, you know that the PM14S1 can certainly get the job done.