Fishman's premium preamp/DI, developed for the acoustic and electric bassist. The Pro-EQ Platinum is packed with a rack's worth of serious processing, all in a stompbox-sized package. Five-band EQ precisely shapes and sculpts bass tone. Feedback fighting phase switch. Soft-knee, pump-free, photo-optic bass compressor. Depth knob (low-cut filter) for big bottom without boom. Exclusive Voltage Doubler Circuit stands up to high output active basses. Easy access battery compartment. XLR DI with ground lift and pre/post switches for pro-sound and recording. Tuner/Send output. Rugged injection molded case. 3-way power from 9V battery, 48V phantom power, or AC adapter.