I ran across something funny tonight. Durring my bands practice I unplugged my 18, and ran full range into just the RC210's 10" speakers. It was loud, good deep lows (though I did not use my B at all tonight), and actually kind of sounded better. I need to try this with my other basses also, but I am wondering if I am getting anything at all out of biamping with the 18. I forget who it was, but someone mentioned that 200 hz is somewhere on the D string. That is the lowest you can biamp on the RC210. That means that the 10s get nothing but clicks and harmonics (cool rhyme!) and all the fundamental sound comes from the 18. I honestly don't think that rig is any louder with the 18. Maybe I should just sell the 18 and keep only the RC210?