Infinity Epsilon/ Beta speakers-- Classsics???

The Betas can sound terrific. The best sound I got out of them was with ARC tubes on top and a QSC 3000Mx on the bottom. I used Cardas cables. Also had to refoam a woofer.

No experience with the Epsilons.

Good Luck!!

I owned a pair of Infinity RS-1b, the predecessor to the
Infinity Beta, and a friend owned a pair of Betas.

Yes, they are both classics. Each system has it's strengths
and weaknesses but on balance they are among the finest
of speakers EVER made. I sold my RS-1b's because I moved
and my present room is too small. Both systems are a
bargain on the used market, when they are available.

I can't speak to the Epsilons, I've never heard them.

I've got to go along with Jvogt, the RS1x series were quite good as well and a really silly bargain today. They're not perfect but damn close for the money. I've got to laugh today at the "dumbing down" of High-End. Case in point: Totem, sure, the little critters sound good, but most of these folks chasing the dream have never experienced a true full-range speaker, and never will at today's pricing. The big vintage Infinity RS1x and Beta not only gave you the music, but the excitement as well.
Have you ever been in a large church or hall with a pipe organ? If you have I'm sure you can relate to the feeling in your chest of the movement of air around the lower fundamentals. My Betas can reproduce that "charged air" in my living room with ease. Show me another speaker available used at around $5000 that will do the same!

First, many thanks to those who responded. In my original post on this thread, I meant to ask about the newer model Sigma(vintage 1997) and how it compared to the Epsilon, or other high end speakers of today. I never was a big fan of Infinity speakers, but these models seem to be much different. Therefore, any one familiar with the sound quality of the Sigma; because, I could not find any reviews on the net about them. Thank you!

The IRS Betas are hard to beat, and at the price they sell for used, giant killers. I agree that ARC tubes for the panels are a no-brainer, as they were built and tuned with these electronics. They need a big room, lots of watts and quality components in font of them. I have had them for 5 years or so and have no interest in replacing them (upgrading is now focusing on front end components).
See http://www.audiophilia.com/features/tm1.htm for thoughts on appropriate room considerations for these speakers.