Bartolini 4.2AP 2-Pickup 4-Knob 2-Band Vol P/P A/P - Vol - Treb - Bass



  • 2-Band: 2-Pickup, 4-Knob
  • VPP A/P - Vol - Treb - Bass
In Stock Today

These are in our warehouse. Order it before Noon (Eastern Standard Time) and we'll ship it out today, otherwise we'll ship it the very next business day.


Will this work in your Bass?

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Control Configuration

  1. Volume (with Active/Passive push-pull)
  2. Volume
  3. Treble
  4. Bass


A Pre-Wired harness saves the time and aggravation of wiring your pre-amp and pots into your instrument. They feature our industry leading pre-amps and premium audio-quality potentiometers with smooth control and ready for years of rugged use.

Bartolini preamps offer many popular configurations available for many control layouts. Tonally the Bartolini preamps are comparitively punchy in the low, low midrange, and midrange. The top end is 'note' bright. These units contain gain control which allows the user to set the signal to output level via a small trimpot on the module.

These preamps are not recommended for fitment in top routed Fender style instruments with the control cavity on the top. Intended to be used with an instrument with a rear control cavity.

*Modification Needed:

Bartolini preamps are built compatible for use with passive pickups such as Bartolini, Aguilar, Nordstrand, Delano, and other passive pickup manufacturers. If using active pickups preamp passive stage of Volume and Blend will need to use 25k pots. A single 9v battery is sufficient to power both active pickups and a Bartolini preamp simultaneously, but we recommend 2 9v wired for 18v if there is enough room inside the bass

Technical Specifications

  • Bass: +/-14db @ 30 HZ
  • Treble: +/-16db @ 10 KHz

Question: Where Can I Buy a Bartolini 4.2AP 2-Pickup 4-Knob 2-Band Vol P/P A/P - Vol - Treb - Bas?

Answer: You can buy this from Best Bass Gear by Calling 877-839-3531 or Emailing us at or chatting with our Bass Techs


Rate and Review this item
Verified Buyer
Replacement For Ibanez
By Allan
This is the second Bartolini preamp I've installed. Love the tone.This time I replaced an Ibanez preamp that had very limited tone variations. Works like a charm! Being pre-wired made the installation much easier. Shipping was very fast, much quicker than they tell you! :-)
Verified Buyer
Church Bassist.
By Manuel Cantu
I'm a committed Bartolini fan. I just installed this preamp and Bart Pups on a my fender deluxe 5 MiM and the bass has a whole new clean and vintagy sound with warm lows and Marcus Miller sounding slap. Great upgrade IMO.
Verified Buyer
Bartolini 4.2 AP Review
By Adrian D. Bell
Preamp is working great; the tech who installed it had to rewire the A/P switch (was backward), other than that, no problems.