i don't know either, the tweeters and the woofer are the same.
the 5A have a 6.9" driver+Esotec tweet 50watts
the 6A have a 6.7" driver+Esotec tweet 100watts
the 6A are about $700 more?? thats alot of 703+Bass traps and mopads.
"for me" at this level, DYN's probably have a very nice Active design worked out. I'd have to go active...
the DYN5A are looking really good, price.
the 6A... 100watts.