Very-nice stuff. Man, that quad QR-6500 is a lot bigger than I expected it to be (I've never owned a quad model before. I have 2 of the 2-channel receivers from that era. Sansui made great stuff back then.
The speakers on the right. Bottom one is a Polk (Right?), but what about the one on top of it? That looks like a Polk too, but the nameplate/badge looks different than the other one.