Luxman is a great pairing. Cambridge Edge series also. I’ve got three Spendor D series speakers. D9.2, D7, D1. The next amp I get will probably be Luxman L509x for the 9.2’s. Have CA Edge W and NQ on the D7’s, and the D1’s get Electrocompaniet currently. Still building out the 9.2 system.
Agree that the D series is a more modern sounding speaker than classic Spendor, and I prefer that about them. So I wouldn’t pair with a brighter sounding amp, for example. I'm a fanboy and also have the older SA1's, which preceded the D1's, and have the tweeter that is similar to the classic Spendor sound. So I like both but prefer the D series.