Bill, that’s my whole challenge, finding a 1-space power amp powerful enough for bass. I could then use a 3-space rack for F-2B, SF-2, and amp, but right now the only power amps for bass I know of are 2-space. Jazzy uses one, but they don’t sell it in the US. I have a Carvin DCM200L that I use in a 2-space rack with an F-2B for guitar, but it’s not powerful enough for bass. So, if I want to use my SF-2 and keep everything in one case, my search continues.