Eidolon vs Opus

The Edolon's will give you a bigger sound with greater extension in the bass.

I would strongly suggest you listen to the Kharma speakers. They are much more coherent and much more transparent and resolute. They go deeper and are a HUGE step over the Avalon's.

Are you going to CES? If so, they will be shown with the Tenor's and the LAMM's.

You might want to go to www.avalonacoustics.com and post a question on their forumn. I'm sure that question has been asked before. I have heard both and the Eidolon takes your wonderful speaker to a new level. I'm thinking you like Avalon speakers since you are considering staying in the family. To me they make some of the best speakers around. Try and give them a listen before making the jump but I bet you will be very happy if you move up.

And since then Kharmas have anything more or less listenable under 70 Hz. No wonder that their Ceramic 3.2 are this best sounding model and all their larger models (more bassy) are just a pile of audio junk.