green mountains

I agree with Bombaywalla's post. Although I have not heard the RIOs, I did hear one of the last Europas at GMA and I own a pair of the first EOS made (recently upgraded by Roy to EOS HX). Each EOS is supported on LF by a GMA Hammer Lite using an Audio Control Richter Scale III low pass xver at 48 Hz, no high pass filter used for the EOS. Each of the 4 speakers are fed by ~200w monoblocks - new Hypex NCore for EOS, W4S SX-500 for Hammer. I listen mostly to acoustic music - classical, country, folk, and some classic rock and jazz. The 200 watts is much more than is needed to drive these speakers to very loud levels. The EOSs provide very accurate and realistic music reproduction, be it seated at the "sweet spot", standing 3-4 feet behind, or even in the next room (listening to a CD of the same musician playing the same Bach violin sonata on the same Strad that I heard live at a local performance while walking in the foyer of a local hall). I have no reason to change to anything else; the GMA speakers - EOS and Hammer Lite - are bargains in the current market.

Kenjit, I agree with Dgarretson. The couple of nearest audiophiles I've had in for listening sessions did not remark on any frequency imbalance of either EOS or the updated EOS HX. Nor of any bass deciciency of the Hammer Lites.

Prdprez, I have spent many hours of discussion on phone and at GMA discussing details of loudspeaker design and measurement. The discussions were very informative and educational as my graduate study of physics ended over 40 years ago. I believe part of Roy's mission is in education and is very generous with his time.

Dallasjustice, I think this is off topic, but if there is a way to respond directly to you I have not discovered it.
In short, I find them extremely good - I now have 3 amps to dispose of.

Cporada, My EOS were among the first built and Roy had made some modifications to the crossover. In Nov 2011 I think the cost was around $800: the only things NOT replaced were the HF driver and the enclosure, and I drove them to Roy's place so shipping was not needed. I think it took about 3 hours for the total job. Differences are most notable on the LF end - better than before. BTW, since I was able to sell several amplifiers and my old speakers (Linns and Velodyne) that I replaced with a pair of GMA Chromas driven by W4S SX-500 monos - very good sound indeed, much like the EOSs - and more than sufficient for the small room where my digital darkroom is located.
George