Best speaker for the Spectral DMA 360 series 2 amp

I think you're going about it wrong and you'll most likely not achieve the great results your equipment is capable of delivering. As a rule you should match your speaker to the room and then match an amp to the speaker. Unless you listen in the near field, your room will tend to "swallow up" most direct radiating speakers. I think that's what you experienced with your Avalons. This problem won't go away with any of the smaller Wilson speakers. You need a speaker that can move large amounts of air from the midrange down into the deep bass. Very few direct radiating speakers can do that. You should consider the Zu Definitions, JBL Synthesis or something from Classic Audio Reproduction.

Onhwy61
You say "very few direct radiating". Do you think larger panels would be better for the room?

Also just keep in mind I'm looking for the best bang for the buck for this room even tho I may not be able to afford the ideal.

I have no idea how Magneplanars would work in your room.

The Zu Defs are a little over $10k, while the JBL Synthesis and CARs are closer to $20k. The most cost effective solution would be to pick up a pair of vintage Altec VOTT type loudspeakers and refurb them. They are specifically designed to work in the large spaces. A decent condition used pair and the cost of refurbishment might run around $4k. There's a story in the current Stereophile about getting Altecs to work at their best.

Magnepan or dynamic speakers? There is a huge difference in presentation between these vastly different speaker types. This is one decision you should make before going forward.

For years Spectral teamed with Avalon Acoustics and MIT cable. I believe they called the system 2C3D or two channel three dimensional sound.