If you were to place 2 of the same model organs (As, Bs, Cs, or RTs) in the same room, hooked up to 2 of the same model Leslie speakers and 2 PR-40 tone cabinets (minus the A-100 since one is already equipped with the PR-40), you are logically supposed to produce the same sound, but you don't. The age of the wood encasing the speakers have an impact on the way the sound waves bounce off of them. Also, each instrument is hand crafted by different people in different model years, and each instrument is treated differently once it is purchased. So, no Hammond organ sounds exactly the same, but I would obviously prefer Hammonds with a deep bass and a screaming treble. The A-100s that I've played on seem to have that combination more than the other models, but the model doesn't really matter to me.