I agree with Biltmore. It would be great to hear from users of Conrad's other brain child. Hopefully there are some other Biamp users, present or past, that will add comments to this subject.
I've used Biamp equipment since 1981. My first purchase was an 883 mixer and a TC-120 stereo power amp. Then as I added keyboard equipment, and sometimes an additional musician or two, moved up to the 1283 mixer, and then finally the 1683..which I still have. I prefered their 83 series mixers over many other brands available at the time...including Sunn. The 83 Series sounded great and was lighter in weight than the other two mixer series made by Biamp; the 21 Series, and 42 Series. The 21 Series had several more features than the 83, but weighed about twice as much as it's 83 Series counterparts. The 42 Series was the top of the line in the early 80's and was even bigger and heavier than the 21 Series, and in my humble opinion, was best used as a recording console or bigger show bands that had roadies to schlep it around.
I still have the following Biamp equipment, and it all works great after all the years of use I've put it through.
SM-23 Electronic Crossovers (2)
TC-60 Power Amp
TC-120 Power Amp
883B Rack Mount Mixer
Lets hear from some other Biamp users out there!!!!!