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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
It's Arriving Soon!

Bartolini has told us we will have more of these within a few weeks. Order it now, and we will ship it the same day we receive it from Bartolini.


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


Rate and Review this item
Verified Buyer
Church Bassist.
By Manuel Cantu from on 12/27/2013
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 from on 12/27/2013
Preamp is working great; the tech who installed it had to rewire the A/P switch (was backward), other than that, no problems.