FirstWatt with Quad Speaker Question

Hi there, I tried searching for anything that would ans my question but was not able to find any around. So im hoping someone with exp or a knowledgable member can chime in.

I recently got a Quad esl 57 and it's amazing, and got me thinking perhaps I should try the Quad 63 as well. It seems if im correct the 63 has no crossover and if so would this be a safe and possibly good paring to my F1J?

Second question is I have a quad 303 to use with the 57 and sounds good but im curious if a F7 might be a safe and good paring as well?

Thanks again guys!
 
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