Hello Nandric,
sure, i can give you a bit of an overview: The first model was called the "Fullrange" which is until today the largest model they made which employes only ribbons (or planar magnetic bass / people agree to disagree on this point). The Scintilla came second and was a bit of a Fullrange cut in half but with a unique midrange tweeter system that sat in the same slot. With one large pure aluminum ribbon in the middle and 4 ribbon tweeters around it. Later came other models such as the Caliper and the Duetta (smaller 2 way systems) followed up the new replacement 3 way Apogee DIVA (never reached the Fullrange) in sound tough. Although i only allow myself this remark with respect to other Apogees. Later came some hybrid models and the smallest Apogee called the "Stage". The hybrids such as the Mini Grand and the Studio Grand where hybrids where the bass panel stopped at around 70Hz and a subwoofer was employed. These are generally very good and capable of higher dynamic swings and could be used on lesser powered amps. In the early ninethees Apogee developed a speaker called "The Grand" which is a 4 way fully active ribbon speaker. Tweeter ribbon, midrange ribbon, woofer panel and basically a Krell Master Reference Subwoofer below it. Its about a 1300lbs without the packaging and comes with 4 built in krell mono amps for the subwoofer and (user selectable) woofer or tweeter. The customer has to apply additionally 4 channels of amplification so the system uses a total of 8 mono blocks to fire the speakers. Comes with built in displays and computer systems to adjust the rake, user presets, phase etc.... of all the drivers individually. About 7 pair or so were ever made costing over 85000$ in the early nineties. Extremely rare and to my ears the absolute pinnacle of sound. I had a Scintilla before and have friends who have them. An extremely good speaker and less space consuming then the Fullrange or Grand. Graz in Australia makes the spare parts in very high quality and excellent customer service. He even make a new Scintilla which can be driven by tube amps. :-)