I installed them on an old Marantz amp, which is also connected to my (new) TV. As he visited me, he couldn't believe the incredible sound coming from his own speakers. My friends are shocked by it too, thinking I'm some audio buff that invested 20K.
My dad regretted the gift, went to buy the same amp yet with new speakers. Various sets of it, and failed to come close to the ancient set.
I'm not sure what exactly was innovated in 35 years of audio, but my guess would be costs, not quality.
We built a set of these: https://projectgallery.parts-express.com/speaker-projects/zd... which are a throwback to the old HiFi sets of the 70s-80s. I _really_ like the reference sound of this set. The only thing they don't really do is the sub-sonic punch that action movies require, but that's probably ok for apartment living with neighbors.
And I'm quite sensitive to acoustics. In a lot of modern "minimalist" homes I'm upset by the sound bouncing around endlessly, sometimes it's so bad I can barely hear conversations.