Get the SF-2, it can make any amp sound incredible! It is the missing ingredient to your sound that you always wished you had but never knew how to get. I have had mine for a little over a year & used it with my Eden WT 800 & Fender Rumble 350 combo, & it made both amps sound exponentially better. It is super easy to dial in a room & find the punch frequency you need to get a nice punchy bottom end with crystal clear highs as well. I just bought a F-2B stereo preamp, & Jazzyvee is right, with an Alembic preamp you don't need the SF-2 as much, but I still use mine to find the sweet spot from venue to venue. I make adjustments much more on the SF-2 than on my bass or preamp. It is the Do All tone shaper! I will give you this advice though......don't be happy until you own BOTH! The combination of an Alembic preamp & a SF-2 is the ultimate bass rig!