which onboard active preamp has the least coloration of the sound and has the most natural tone? by natural i mean that, with flat EQ, the bass sounds pretty much like what it does acoustically. no noise either of course. this would be going into my ss2. ideally - i'd like the pope preamp that comes in foderas - that's my view of a CLEAR preamp. as for features - ability to run at 18v, 3 band eq (midshift cool but not necessary), active/passive, isolated pickup blending, and a passive tone would also be cool but not necessary. obviously by those features i'm looking at the U-retro deluxe, but i'm sure there are some other obscure high end preamps. i don't think i'd change the pickups - i like the sound of the bass in passive mode. any ideas?