I have a really nice pair of DQ-10’s that I spent 4 months restoring. They came out absolutely gorgeous and sound great.
I did replace a few of the caps mainly because they, more or less, crumbled when I touched them.
Your receiver, IMHO, is barely the minimum required to drive these. They are a little inefficient and need more power. I agree that a larger amp would be beneficial.
There is a lot of help online if you want to restore/repair or just get more info on them.
Again, IMHO, they still hold their own against a lot of the competition. Marvelous speakers when driven well and correctly setup.
Good luck and let us know what you do...