I too think the Marten speakers are fantastic. I heard them at the 2015 Newport Show, hooked up to EAR-Yoshino tube amps. Before you get new amps, maybe you can compare your Avalons to the Martens.
Where do I go next?
Ending my 20yr affair with Spectral gear. Considering all Pass electronics. Wanted CAT tubes back in the day but was out of my financial reach then. Now I am wide open. Any suggestions? I did attend Axpona this year ; The CAT/ Martin system was MY best of show. Thanks in advance guys and (Gals, If they're out there!)