I am not going to go into detail about these amps... you probably already know about them... if not, go HERE to learn more. This is a very rare, documented prototype guitar amplifier hand-built by Bill Krinard himself during the development of the Opal amplifier either in 2001 or 2002. Not sure which. This amp is registered at Two-Rock and comes with all of the original documentation and hang tags from the shop. It is essentially an Opal built inside an Emerald Pro chassis. Again, it is not a production-line Opal. Joe Mloganoski emailed me a while back and told me a little about it and verified that Bill made this amp himself. He also said he remembers it as being a "great amp" and that I should contact Bill directly to find out more. I have not done so yet, but will probably do so soon and post more for you. I was lucky to acquire this amplifier from a collector friend but never played it. I had a special Avatar 2-12 speaker cabinet matched and custom-built for this amp, as well.