Hey, not only will an SF-2 allow you to achieve the tonal capabilities of a Series II, but will far EXCEED them - both in range AND type (i.e. the addition of high-pass and band-pass functions, etc.)! ANY of the Alembic electronics configurations will provide the low-noise/high-fidelity response we've all come to expect, and that, combined with an SF-2, provides (in my opinion, at least) the best bang for the buck available. Additionally, an SF-2 is (again, in my opinion) a more user-friendly device than a Series II, on account of having NUMBERED controls. If you find a particular tonal setting you really like, it's simply a matter of writing down the numbers somewhere to be able to RE-access it later on - something that's not so easy to do with a Series II (and BTW, my first Alembic HAD Series II electronics, back in '76). Now, I WILL admit, the Series instruments DO possess a bit more high-frequency response than the other instruments do, BUT - and particularly once the guitars and drums kick in as they have an annoying tendency of doing in the real world (how DARE they, I ask you?!)- will you REALLY be able to even HEAR it? Well, I for one, COULDN'T, and I'll admit it!
