вернулся на Лебедя и понял в чем фишка, на Аресе больше гейна и меньше динамики...!
Похоже, что-то подобное и есть.
Вот что написал Клифф про последнюю прошивку на Аксе (полагаю, те же изменения и для ФМ3 есть)
I would say that the biggest change in 19.x vs. 18.x is the clipping behavior of the power amp. The preamp is not changed at all so anything you are hearing is due to the new CNFB power amp stuff.
The power amp clips softer now. This is more accurate, however. If you want a harder power amp clipping, which people that are into aggressive styles may desire, increase the Power Tube Hardness parameter. Or turn the MV down a little.
19.x also introduces an improved feedback algorithm in the power amp. It uses what I call "hybrid feedback" and is a way of replicating analog feedback in a nonlinear discrete-time system. This yields better frequency response accuracy above 10kHz compared to 18.x. 18.x tended to be a little brighter as a result. To get this brighter sound in 19.x increase the Transformer HF value.
For FAS Modern III nothing else has changed from 18.x to 19.x