Fishman PlatinumPro Universal Instrument Preamp/DI 

17-Volt, high-headroom, discrete Class-A preamp
5-band tone control with sweep-mid & low frequency filter
EQ mode tailors EQ for bass or most other instruments
Phase control and precision notch filter reduces feedback
One-knob adjustable compressor smooths playing dynamics
Integrated fully-chromatic digital tuner
Volume boost foot switch with level control
Balanced XLR D.I. with pre/post EQ setting and ground lift