More Views

Richter 3BP 1 or 2-Pickup 3-Knob 3-Band Vol - Treb/Bass P/P A/P Stack - Mid/Mid Stack

SKU:BBG 6991


  • 1 or 2-pickup, 3-band, 3-knob
  • Volume - Treble/Bass Stack (Push-Pull Active/Passive) - Midrange Stack (Parametric)
In Stock Today


Richter 3BP 3-band Preamp

The BassXX Preamp (pronounced "Bass-ics") is a filter-based pre-amp which provides very flexible parametric EQ control with sweepable mids.

Its outstanding sound performance is achieved through careful circuit design with attention to detail and selection of finest components available.

It has an extremely low noise floor and a tube-like dynamic response. The warm and smooth sound has no discernable hiss even at extreme high frequency boosting.

Because the input impedance is higher than most other bass and guitar preamps, passive pickups will retain their natural frequency response and tonal character, as well as piezo ceramic transducers will do.

Pulling 'up' on the treble control achieves true bypass of the EQ and allows for passive operation.

The passive sound is virtually identical to the active sound in tone and level if the EQ is set flat. In passive mode, only the volume controls works, but passive tone control can be added on custom instruments.

The onboard circuit in combination with the battery power supervisory is a patent pending product. When the blue LED starts to flash the battery is getting low and needs to be changed within roughly 10 hours.

All BassXX EQ's/Pre-amps are completely shielded, this means no additional shielding of your instrument control cavity is required.


  • High definition amplifier design results in precise and smooth sound reproduction without signal losses.

  • 0.1% precision metal film resistors in the signal path with a resultant noise factor of up to 10 times lower than standard thick film resistors.

  • Low tolerance film capacitors featuring lowest distortion and superior linearity.

  • Highest quality available trimmer pots.

  • Completely shielded and encapsulated - no shielding inside the instrument is required.

  • After manufacture each unit undergoes a throughout test and inspection. This ensures each unit passes strictly quality standards. Serial number is carried out for traceability purposes.

  • Please Note:

    Installation of the preamp will require some basic soldering skills. Instead of not being difficult, professional installation is recommended.

    Note: Excessive heat and incorrect soldering equipment usage or selection may damage the electronics.

    Control Configuration

    1. Volume
    2. Treble/Bass Stack
    3. Midrange Stack (Parametric)

    The BassXX 3BP includes the above potentiometers, output jack, battery-clip, and low-battery-LED.

    Technical Data

  • Input Impedance: 2.2 MΩ

  • Output Impedance: 47 kΩ

  • Frequency Range: 7 Hz to 22 kHz,
  • Reviews

    Rate and Review this item
    Verified Buyer
    Richter delivers the goods!
    By Frank Brocklehurst from on 6/28/2016
    Installing this preamp into a fretless 5 string for one of my customers. Quick easy instal and easy to connect parts without soldering. Noise floor seams average with good choice of EQ points. Two thumbs up. I am a experienced luthier with 20 years in the field and I am very picky about preamps.