I own the Auteur, pretty neutral, good sub-bass, liquid mids, no sibilance, not bright but excellent top end. If there are spikes anywhere in the FR spectrum my dulled out, 49yr old ears can’t detect them. They play well with all my amps but sound sweetest to me through my old Decware CSP2. ( i enjoy a rich, full body, bold but airy sound signature most with strong vocals)
For me they were the perfect pair of ZMF’s. I really think all their offerings are excellent though. It’s not only about sound, i also like everything about the product. It’s a great value, to get this much quality material and build for between $1-$2K.