The Radial Tonebone PZ-Pre™ is the most powerful acoustic preamplifier ever to be put inside a pedal. And when they say acoustic, Radial doesn't just mean acoustic guitar - they mean ANY acoustic instrument including banjo, violin, cello, mandolin, contrabass, bouzouki or lute. The magic lies in the combination of high performance 100% discrete class-A PZB piezo boosters, an ultra-quiet preamp circuit that will adapt to any pickup system and a host of connectivity options that will put you in total control.The PZ-Pre is equipped with two inputs for quick instrument changes on stage. These can also be combined to blend two pickups together if you so desire. Features include a powerful yet warm sounding semi-parametric EQ to tailor your sound, feedback eliminating controls including a dual-Q notch filter to surgically remove feedback, a high-pass filter to cut low frequency resonance, and a phase reverse switch to eliminate hot spots on stage. It is also equipped with a host of outputs: a 1/4" hi-Z instrument out for an on-stage amp, a pre-EQ balanced XLR output for the PA system and a post EQ XLR out for stage wedges or in-ear monitors. A dedicated tuner out with mute switch lets you quietly tune on-stage. There's even a combination power booster - effects loop to add sizzle and dynamics to the performance and extra presence when soloing.FeaturesTwo channels to switch between instrumentsNotch & resonance filters eliminate feedbackPre & Post Radial DI outputs for PA and monitorsPower booster and mute for more control on stageSpecificationsAudio Circuit Type: Proprietary active circuit# of Channels: Dual Input, Amp Out, Pre and Post EQ XLR Balanced OutLow cut roll-off:Position 1: 75 HzPosition 2: 220 HzNotch Freq. range: 56 Hz to 330 HzNotch Q:Setting 1: -8 dBSetting 2: -15 dBPower Boost: Unity Gain to +12 dBEffects send & receive: -10 dBPolarity: 180° switch (absolute phase reversal)Connections:Input-1: 1/4" unbalancedInput-2: 1/4" unbalancedStandard Impedance: 6.8 kΩWith PZB Switch: 10 MΩInsert (FX Loop) Send/Receive: 1/4" unbalancedSend Impedance: 1 kΩReceive Impedance: 15 kΩAmp output: 1/4" unbalanced, Hi-Z, 1 kΩTuner output: 1/4" unbalanced, Hi-Z, 6.8 kΩPre-EQ output: XLR balanced mic level 600 ΩPost-EQ output: XLR balanced mic level 600 ΩFootswitches:Three: Mute, Boost, Toggle 1-2Heavy-duty high-cycle switchesLED indicators:Large 3mm OD ultra-bright LED indicators for: mute, boost, Ch-1 & Ch-2 toggle statusConstruction: 14-gauge steel, baked enamel finishDimensions (H x W x D): 2" x 8" x 4.5"Weight: 2.7 lbs (1.2 kg)Warranty: Radial 3-year limited warrantyPower Supply: 15VDC 400mA, center pole positive Radial Engineering PZ Pre 2-Channel Tonebone Acoustic Guitar Preamp.