I have 3A Signatures, which have the same midrange and tweeter as your vintage 5a (if memory serves). All I can say is that after demoing Quatros I wished I had spent the extra $9K for them, and it all had to do with high frequency clarity (not bass).
So my simple advise is to demo them. If you’re in NJ Johnny Rutan has them set up with Audio Research amplification, to truly great effect.
So my simple advise is to demo them. If you’re in NJ Johnny Rutan has them set up with Audio Research amplification, to truly great effect.