This comes in its original Box. I used a few times for upright and for electric. Has sweepable mids compression and a "notch" dial to help with feedback of acoustic instruments. this sounds killer and is super flexible.
Features
Four-band EQ with sweepable mid-range
Feedback-fighting phase switch and notch filter
XLR DI (with ground/lift and pre/post switches) for pro-sound & recording
Smooth Control: Fishman's compression smoothes out amplified sound
Exclusive Voltage Doubler Circuit for more clarity and greater dynamics
Easy access battery compartment
Tuner/Send output
Input Gain and Master Volume Controls
Rugged injection-molded case
3-way power from 9V battery, 48V phantom power or AC adapter
Designed in response to requests from players, this versatile preamp/EQ/DI is at home everywhere from local open mic nights to major festival stages. With its simple yet precise controls, you can quickly dial in the natural acoustic sound you're looking for; loud, clear and feedback free.
The Pro-EQ Platinum's four-band equalizer is modeled after our gig-proven Prefix Plus onboard preamp, with sliders that are assigned to just the right frequencies for acoustic equalization. A semi-parametric midrange control employs a "constant Q" filter for more precise and consistent tone adjustments. Also borrowed from the Prefix design are feedback fighting phase and notch controls.
The Pro-EQ Platinum features our exclusive "Voltage Doubler" technology, which improves both the dynamics and clarity of any pickup. Another innovation utilized in the Platinum is our Smooth acoustic compression circuit. This control removes the harsh percussive edge from your amplified sound when you play hard.
Sound engineers will appreciate the Pro-EQ Platinum's pro-audio features which include a balanced XLR out, an XLR pre/post EQ switch, plus optional 48-Volt phantom power operation. This means no more batteries or wall warts if your mixer has phantom power. Unique to the Pro-EQ Platinum is a hum-killing ground lift switch that (unlike other acoustic preamp/DI's) works even when phantom power is applied to the preamp.
TECHNICAL DESCRIPTION
Nominal Input Level: -20 dBV
Input Overload Level: +6 dBV
Input Impedance: 10 MW
Nominal output levels and impedances:
1/4 in. Out: -23 dBV + 3 dBV (1 kW)
Tuner / Send Out: -.23 dBV + 3 dBV(1 kW)
XLR Out: -32 dBV -6 dBV (600 W)
Bass Control Range:
+/- 12 dB at 60 Hz
+/- 3 dB at 350 Hz
Treble Control Range:
+/- 12 dB at 10 kHz
+/- 3 dB at 2.4 kHz
Mid Control Range: +/- 12 dB (adjustable from 250 Hz to 5 kHz) Q=0.5
Brilliance Control Range:
+/- 9 dB at 10 kHz
+/- 3 dB bandwidth 7 kHz
THD: Less than .02%, -10 dBV input
Signal to Noise Ratio: 90 dB (A weighted, -10 dBV input, 2 dBV 1/4"output)
Power Supply:
9V alkaline battery (estimated 120 hours continuous use)
Regulated FISHMAN 9V AC adapter
Current Draw 4.7 mA
these sell for $140 new
$95 Shipped 
