It's the BBE BMAX Solid State Bass Guitar Preamplifier ready to give you great bass tones.
This processor is perfect for in the studio and demanding live situations to get your bass sounding fantastic. Although this is a solid state preamp, it has tube emulating technology to give you that smooth, warm tone that is so highly sought after from musicians and sound engineers alike. With controls for Gain, Treble, Mid, Bass, Parametric Mid EQ, Compressor, Master Volume, and BBE Sonic Maximizer's Lo Contour and Process, you'll certainly be able to get a wide variety of tones.
Frequency response @ line out
21.5 X 12 X 3.5