I have a friend who's a bit of a vintage enthusiast. He has a stack of restored Dynaco tube electronics including an ST-70 amp, whose power rating would be similar to your Marantz. He has pairs of both the Dynaco A-25s and the Klipsch Heresies. He switches back and forth from time to time because the Heresies have the sensitivity, transparency, and dynamic jump, but they're bass-weak. When he plays through the A-25s, he gets more bass and more top-to-bottom smoothness, but he then misses the dynamics and transparency of the Klipsches.
The Heresies were created to provide center fill for a pair of corner-loaded Klipschorns. Paul Klipsch named them the "Heresy" because it was his first speaker design not to use a horn-loaded woofer. Bass extension was not a design priority.
I'm trying to get my friend to go for a pair of Klipsch Fortes, as they provide the Klipsch strengths of sensitivity, transparency, and dynamic range, plus the bass extension lacking in the Heresies.
A modern-day possibility might be the Cerwin-Vega CLS-12 or CLS-10.