How loud do you listen in how large a room? (I’d recommend you use a meter or phone app to determine your listening level as one person’s "moderate" volume may be another’s "loud" or "soft".)
If you are a 90 dB or 100 dB volume listener or using them in a large room you’ll probably run out of power.
I am the original owner of a pair of D7.2’s and agree. With my small 18x14 room I can drive the D7.2’s with my 8 watt Ampsandsound Nautilus but I don’t listen that loud and no doubt part of what I do hear is soft-clipping. But here is the interesting twist-I have a 150 watt tube amp and an 80 watt tube amp and with the D7.2’s I prefer the 8 watt SE Nautilus.
The D7.2’s are a somewhat dry "do-nothing-wrong-but-do-nothing-great" speaker. My guess is that the Nautilus injects a bit of much needed warmth. I bought mine without auditioning from a dealer I trusted who strongly recommended them. My other loudspeakers which I use 9 months of the year are the ones I DID audition first-Devore O/93’s. I originally thought I would switch them out every 6 months. If I had the energy I would sell the D7.2’s. I have no doubt they sound better for other people in different rooms with different set-ups.
All that said, they are an easy to drive loudspeaker and they are certainly very good. I just don't love them as a matter of personal taste.