Radial ToneBone PZ Pre Acoustic Preamp

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Product Description

The Radial Tonebone PZ Pre is the most powerful acoustic preamplifier ever to be put inside a pedal.
And when we say acoustic, we do not just mean acoustic guitar; we mean ANY acoustic instrument including banjo, violin, cello, mandolin, contrabass, bouzouki or lute. The magic of the PZ Pre lies in the combination of high performance 100% discrete class-A piezo boosters, an ultra-quiet preamp circuitry that will adapt to any pickup system and a host of connectivity options that put you in control of any situation.

The PZ Pre features two inputs for quick instrument changes on stage, a powerful yet warm sounding semi-parametric EQ to tailor your sound, plus a host of feedback eliminating controls including: a dual-Q notch filter to surgically remove feedback points, a high-pass filter to cut low frequency resonance and a phase reverse switch to optimize the acoustic environment on stage. The PZ Pre is equipped with three separate outputs: a 1/4 inch on-stage instrument amp out, a balanced XLR pre-EQ direct out for the house mix and a balanced XLR post EQ out for stage monitors or in-ears. A dedicated tuner out with mute switch is provided for quiet on-stage tuning as well as an effects loop and power booster to add sizzle and dynamics to the performance!

Radial Tonebone PZ Pre Features
  • Combination PZ booster and preamp
  • Two inputs: two instruments or blend/mix
  • Parametric EQ and notch filter
  • Four outputs: amp, tuner and two DI outs
  • Works with any instrument!
Compact and easy to use, the Radial PZ Pre packs in all of the features you need to take your acoustic instrument from home to studio and club to concert.

PZ Pre Setup
The PZ Pre is more than just a sonically pure acoustic instrument preamp... much more. It's an amazingly versatile on-stage control center for your acoustic rig! As illustrated here, the green arrows show the two independent instrument input channels and the effects receive jack. The red arrows show the outputs, including the stage amplifier output, dedicated tuner out, pre-EQ balanced out, post-EQ balanced out and FX loop send. The three footwitches let you effortlessly toggle between instruments, bring in boost and/or effects and mute the output for quiet tuning. Set the recessed Peizo buffer switches to suit your instrument's requirements, then adjust separate levels to balance them. Lo-cut, Notch filters, parametric EQ and boost level controls allow the perfect fine-tuning of all parameters of your sound.

Radial Tonebone PZ Pre Setup

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Helpful Info about the Manufacturer
Phone:  604-942-1001 Warranty:  3 Year Transferrable

Product Specifications

Radial Tonebone PZ Pre Specifications
  • Circuit type: Proprietary active circuit
  • Standard input impedance: 16.8k Ohm at input jack ('PZB' switch out)
  • Piezo input impedance: 10meg Ohm at input jack ('PZB' switch in)
  • Output impendence: 1k Ohm
  • PZB Booster level: 10dB
  • Low cut roll-off:
    • Position 1: 75Hz
    • Position 2: 220Hz
  • Notch Freq. range: 56Hz to 330Hz
  • Notch Q:
    • Setting 1: -8dB
    • Setting 2: -15dB
  • EQ:
    • Low: Shelving +/- 12dB @ 75Hz
    • Mid: Parametric +/- 12dB @ 82Hz to 5.6kHz
    • High: Shelving +/- 12dB @ 7.5kHz
  • Boost level: 12dB
  • Effects send & receive: -10dB
  • FX loop impedance:
    • Send: 1k Ohm
    • Receive: 15k Ohm
  • Polarity: 180° switch (absolute phase reversal)
  • Connections:
    • Input-1: 1/4 inch unbalanced
    • Input-2: 1/4 inch unbalanced
    • Insert Send/Receive: 1/4 inch unbalanced
    • Amp output: 1/4 inch unbalanced, Hi-Z, 1k Ohm
    • Tuner output: 1/4 inch unbalanced, Hi-Z, 6.8k Ohm
    • Pre-EQ output: XLR balanced mic level 600 Ohms
    • Post-EQ output: XLR balanced mic level 600 Ohms
  • Footswitches: Three: Mute, Boost, Toggle 1-2
  • LED indicators: Large 3mm OD ultra-bright LED indicators for: mute, boost, Ch-1 & Ch-2 toggle status
  • Switching: Opto-coupler assisted, 5msec Rise time
  • Construction: 14 gauge steel, baked enamel finish
  • Size: 8 w x 4 1/4 d x 2 h inches (205 x 110 x 51mm)
  • Weight: 2.7lbs (1.2kg)

Customer Reviews

Review: Erik Submitted: 3/8/2018

Product Rating4 out of 5 stars.



Best Preamp in its Price Range
Product Rating

Product Review

Exceptionally powerful preamp with flat response and headroom. The Piezo Buffer feature ensures that a passive piezo has enough juice and impedance to sound its best and if you have an active pickup, turning off the PZB ensures ample headroom and adequate impedance. The EQ is super effective and the hi-pass filter is a great feature for pulling rumble out of your guitar and if that doesn't work, there's a 200hz hi-pass and a Notch Filter. No excuse for feedback. I've used mine with two guitars equipped with passive Baggs piezos (LB6 and iBeam) and the LB6 sounded its best with this unit. I think, in the future, I'm going to set up the PZ Pre to blend inputs instead of toggle between guitars. I'm possibly going to add an active mic to my guitar and I think it'll be interesting to experiment with its blending capabilities. This preamp does it all but I won't give it a perfect score as some might prefer separate EQs for separate sources. That said, it's pretty much perfect.

Review: Mike B Submitted: 5/28/2014

Product Rating5 out of 5 stars.



Great acoustic preamp/DI pedal with more features!

Your general opinion of this product.

Excellent preamp to use in your electrified aocustic sound chain. two inputs - selectable with a switch or blendable, and with separate switchable piezo boosters if your guitar does not have a built-in preamp. Dedicated tuner out (don't have to worry about a noisy tuner in line); built-in boost to jack up your volume for leads, switch also controls an FX loop. XLR balanced and 1/4" (amp) outputs. Notch filter to take out the bad feedback frequency. Semi-parametric EQ.

Very solid and sturdy, built well.

Switches are tough and you know when you are engaging them, all jacks seem sturdy.

N/A. EQ works well

Switches work!

High quality finish

So far so good!

Review: Guitarman from fairfax, va Submitted: 12/19/2011

Product Rating5 out of 5 stars.


Great little box for blending of my K&K and Sunrise pickup

Very well made

it's sturdy product

Your general opinion of this product.

well built, very easy to play

Great tone out of this box.



Review: cabinetfiddle from Wilkes-Barre, PA, US, Submitted: 3/1/2010

Product Rating4 out of 5 stars.


Seems Solid, Sounds Great.

Solid, except for the foot switches...

So far it's held up well. I have a feeling the footswitches might be an issue... I think they're the same type as the line 6 modelers have.. which I've had fail... they interact with a board mounted switch instead of being actual switches... I'm gonna baby them.

Your general opinion of this product.

Vastly improved the sound of my piezo violin pickup.

low cut, and EQ work nicely... though, I'm not quite sure if the center hash mark on the unit is actually "0" as if you turn it all the way left and right, the line on the knob isn't actually centered...


Manuals & Docs