Spade to banana adapters

I don't think so, but try the Cardas adaptors which you should be able to order from Parts Connexion

http://www.cardas.com/cabd.php

good adapters should work fine, without degrading sq

No! 

I use adapters as you mentioned in your opening question in some of my systems and I've not heard a degradation in sound quality.

Well, the more connections and different types of metals should affect sonics. Notice I said should?

ozzy