You have no items in your shopping cart.

MXR M281 Thump Bass Preamp Guitar Pedal

Manufacturer: MXR
The MXR Thump Bass Preamp is a tone-sweetening, signal-boosting, and altogether groove-enhancing machine.
Availability: Backorder - Contact for ETA
+ -
Estimate shipping

This pedal was conceived when the MXR design team and our in-house bass players discovered that the Echoplex® Preamp’s sonic secret sauce made for just as delectable a pairing with bass as it does with guitar.

Using that circuitry as a foundation, the MXR team added a simple yet potent tone-shaping interface so that you can dial in the perfect bass sound for the stage and the studio.

Crafting the sound you need is easy. The Echoplex Preamp circuit conditions your signal with a carefully balanced EQ profile, and this pedal’s tone controls let you take it from there.

The Treble and Bass knobs cut or boost frequencies at 4 kHz and 40 Hz respectively, while the Mid knob cuts or boosts the midrange as set by the Frequency knob, from 250 Hz to 1 kHz.

This range of frequencies was selected to give players maximum flexibility and minimal fuss when refining their bass signal.

Whether you need to punch up a solo, boost your signal in a live mix, or sculpt more edge into the sound of a passive bass, the Thump Bass Preamp packs incredible versatility into an MXR mini housing.


    • Input: Impedance 1 MΩ
    • Output: Impedance 100 Ω
    • Bass: + 15/-7 dBV, 40 Hz
    • Mid: ±16 dBV, 1 kHz
    • Treb: ±10 dBV, 4 kHz
    • Freq Sweep: 250 Hz to 1 kHz
    • Noise Floor: -95 dBV
    • Bypass: True Hardwire
    • Current Draw: 9 mA
    • Power Supply: 9 Volts DC

Watch: MXR Thump Bass Preamp


Please use the Contact Us form on this page to request a price match*.

Please be sure to include:

  • Your post code (for shipping calculations)
  • The price to match
  • The URL (web address) or company selling at this price

*conditions apply

Store Managers at Mega Music

Give us a call on 1300 194 542