MXR M281 Thump Bass Preamp

Description

MXR Thump Bass Preamp

The MXR Thump Bass Preamp - Deep, Defined Tone in a Compact Package
Punch Up Your Bass Tone with Vintage-Inspired Warmth
The MXR Thump Bass Preamp is a groove-enhancing powerhouse designed to sweeten your tone, boost your signal, and shape your sound with simple yet powerful controls. Inspired by the legendary Echoplex® Preamp circuit, this pedal conditions your bass signal with balanced, musical EQ while giving you the flexibility to craft your tone for any stage or studio application. Whether you’re boosting your bass for a solo, cutting through a dense mix, or adding warmth and definition to a passive bass, the Thump Bass Preamp is a must-have on any bassist’s pedalboard.
Vintage Preamp Magic with Modern Control
MXR’s design team discovered that the Echoplex Preamp circuit, known for its secret sauce with guitars, also delivers impressive tonal benefits for bass. This preamp enhances your sound with a musical EQ curve that adds warmth, depth, and clarity to your low-end while retaining the natural character of your bass.
Precision Tone Sculpting with 3-Band EQ and Mid Sweep
The MXR Thump Bass Preamp features a 3-band EQ with a sweepable midrange—an essential tool for dialing in the perfect bass tone. The simple interface allows you to quickly adjust your sound on the fly, whether you're thickening the lows, brightening the highs, or cutting/boosting the mids for better mix presence.

Bass Control: Boosts or cuts low-end frequencies at 40 Hz by +15 dBV / -7 dBV, giving you control over the depth and weight of your tone.
Mid Control: Adjusts the midrange by ±16 dBV, with the Frequency knob sweeping between 250 Hz and 1 kHz—perfect for finding the sweet spot between clarity and warmth.
Treble Control: Boosts or cuts high-end sparkle at 4 kHz by ±10 dBV, helping your bass cut through the mix without sounding harsh.

Versatile Applications for Stage and Studio
The Thump Bass Preamp excels in various musical contexts:

Boost your passive bass to match active instrument output.
Add vintage-style warmth to modern, high-fidelity bass signals.
Enhance solo sections with added clarity and articulation.
Sculpt your sound to sit perfectly in a live mix or recording session.

True Hardwire Bypass for Signal Integrity
The MXR Thump Bass Preamp features a true hardwire bypass, ensuring that your signal remains pure and uncolored when the pedal is disengaged. With an ultra-quiet noise floor of -95 dBV, this pedal delivers pristine tone without unwanted hiss, even at higher gain settings.
Compact, Pedalboard-Friendly Design
Housed in an MXR mini enclosure, the Thump Bass Preamp takes up minimal space on your pedalboard while delivering maximum tonal versatility. Its rugged construction ensures that it can withstand the demands of touring and regular use, making it an essential tool for gigging bassists.
Flexible Power Options for Easy Integration
The Thump Bass Preamp runs on a standard 9V DC power supply and is compatible with the Dunlop ECB003 adapter as well as the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included).
Specifications
Input/Output

Input Impedance: 1 MΩ
Output Impedance: 100 Ω

Tone Controls

Bass: +15 dBV / -7 dBV @ 40 Hz
Mid: ±16 dBV @ 1 kHz
Treble: ±10 dBV @ 4 kHz
Mid Frequency Sweep: 250 Hz to 1 kHz

Noise Floor

-95 dBV (A-weighted, all controls at mid position)

Bypass

True Hardwire Bypass

Power Requirements

Power Supply: 9V DC (center-negative)
Compatible Power Options: Dunlop ECB003, DC Brick™, Iso-Brick™, Mini Iso-Brick™
Current Draw: 9 mA

Physical Dimensions

Enclosure: MXR Mini Housing
Width: 2.0" (50.8 mm)
Depth: 3.63" (92.2 mm)
Height: 2.13" (54.1 mm)

Construction

Material: Die-cast metal
Footswitch: Heavy-duty for reliable operation

Additional Features

Echoplex Preamp Circuit: Adds warmth, clarity, and natural compression
3-Band EQ with Mid Sweep: Precision tone shaping for any musical setting
Compact and Portable: Mini enclosure saves pedalboard space

This pedal works nicely as intended and is in excellent condition, exhibiting only very gentle external wear and has had velcro applied to the bottom as can be seen in photos.
This bass preamp pedal ships fully insured with signature required.

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