I can't say enough good about the
Acoustic Image stuff. To this day, my primary upright bass rig is my old Clarus II, an earlier 2-channel model. In addition to a fantastic EQ section, it has a flip-switchable notch or high-pass filter, a DI, an effects loop send/return, and two SpeakOn outs. Fits in a zipper bag with all cabling. It sounds great with bass guitars too, and you can connect any combination of speaker cabinets to it imaginable. It's so good, I put an Alembic sticker on top. Now what I need is a Classico...
(*the Jeannie and the Rakhi are just for good luck...)