I heard a lot about CAT amps driving Avalon speakers although I have not used any for my Ediolon. Lack of authoritative bass- can it be your preamp matching with your amp? If not, you might want to look into speakers positioning. I noted very minute change even in a fraction of degree for toeing in or out would make a big different to the sound. I took couple of years to get the right position for Ediolon--painful! In only for tubes-my taste as well. Believe it or not, I tried many tube amps with Ediolon before and they includes Jadis JA-500,VTL Ichiban,VTL-750,Hurricane ASL,Audio Research VT-100MkII etc.. spent a lot of money. I finally settled down with technology which is more than 30years old--a pair of McIntosh 275 run in mono block (150W per channel). The mid is something I will die for. The bass -- deep and authoritative. These happen only after I used combination of 12AX7 and 12AT7 for the small tubes and KT-88 as output tubes. I paired these amps with CAT ultimate preamp. Ironically,these amps do not cost me a lot for such an expensive pair of speakers.
