Bartolini 4.7AP



  • 3-Band: 2-Pickup, 4-Knob, 1-Switch
  • VPP A/P - Bl - Treb/Bass Stack - Mid - Mid Switch

Will this work in your Bass?

Frankie - Bass Tech

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Control Configuration

  1. Volume (with Active/Passive push-pull)
  2. Blend
  3. Treble/Bass Stack
  4. Mid
  5. Mid Frequency Selector Switch


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
  • Midrange: +/-10db @ 250, 500, 800 Hz. *Note: Mid P/P has 250 & 800Hz selections, Mid switch allows all three frequencies.
  • Treble: +/-16db @ 10 KHz

Question: Where Can I Buy a Bartolini 4.7AP?

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
Great Marcus Miller bass upgrade
By Manuel Cantu
I have read many reviews about what preamp (pre) Marcus Miller uses and some reviews claim he uses a modern 4-knob Bartolini pre. I now know, by comparison, that he's using a Bart pre, most likely the NTBT 4.2 this NTMB 4.7 however, comes with a mid-frequency selector switch that replaces the active/passive switch. This is the only upgrade you'll ever need to perfect the Marcus Miller sound on your MM4 or MM5 bass. BestBassGear is truly the best place to buy your pre! IMO.
Verified Buyer
Very good aftermarket upgrade for your bass.
By Stijn Kenens
I've put this in a Cort for a customer, It opened the sound completely, just with the stock pickups.
It' already his main bass, but he wants to make it better with time !

Wires are sometimes a little bit to short, specially when you have to fit the pots in existing holes ...

Verified Buyer
By Richard Bills
Great preamp and instructions.
Verified Buyer
Amazing pre-amp.
By Carlos Salazar
This pre-amp is great. It sounds amazing. I recommend getting this one over the active only because if your battery dies, you can still finish your set with this one! The boost/cut knobs really do change the tone. The mid selector helps too. You won't be disappointed.