Pricing and availability
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Average Price: $141
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$199
$500+
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Price History
Based on price data from 5 merchants for "MXR M281 Thump Bass Preamp". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Unleash the full potential of your bass with the MXR M281 Thump Bass Preamp, a compact powerhouse of tone-shaping magic. Known for its Echoplex Preamp circuitry, the Thump offers a delightful blend of warm, rich tones and punchy dynamics that bassists crave. Whether you're on stage or in the studio, this pedal is your ticket to elevating your sound to new heights.
With its user-friendly interface, the Thump lets you effortlessly craft your signature sound. The 3-band EQ gives you precise control over your tone, allowing you to enhance or cut frequencies with ease. The Bass knob targets the deep 40Hz range, while the Treble knob focuses on the crisp 8kHz frequencies. For even more versatility, the Midrange control is adjustable from 250Hz to 1kHz, making it perfect for sculpting your sound to fit any musical context.
Designed with the needs of modern bassists in mind, the MXR Thump Bass Preamp is compact but mighty, fitting seamlessly onto any pedalboard. Whether you're looking to boost your live signal, add an aggressive edge to your passive pickups, or simply sweeten your tone, the Thump is your go-to solution.
Key Features:
- Echoplex preamp tailored specifically for bass guitar
- 3-band EQ with adjustable mid-frequency from 250Hz to 1kHz
- Bass control at 40Hz and Treble control at 8kHz
- Compact MXR mini housing for easy pedalboard integration
- Perfect for enhancing solos, boosting live signals, and adding edge to passive pickups
Product specs
| Pedal Type | Preamp, Boost |
| Analog/Digital | Analog |
| Inputs | 1 x 1/4" |
| Outputs | 1 x 1/4" |
| Bypass Switching | True Hardwire |
| Power Source | 9V DC power supply (sold separately) |
| Power Usage | 9mA |
| Height | 1.62" |
| Width | 2.12" |
| Depth | 3.62" |
| Weight | 0.43 lbs. |
FAQs
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What are the main features of the MXR M281 Thump Bass Preamp?
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The MXR M281 Thump Bass Preamp offers preamp and boost functions, is fully analog, and features true hardwire bypass. It has 1/4" input and output jacks and requires a 9V DC power supply.
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Can the MXR M281 Thump Bass Preamp be used with active basses?
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Yes, the MXR M281 Thump Bass Preamp works well with both active and passive basses, providing a versatile tonal shaping option for various pickup types.
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How does the MXR M281 Thump Bass Preamp affect my bass tone?
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The MXR M281 Thump Bass Preamp enhances your bass tone by boosting the signal and providing EQ adjustments, allowing for a more defined and powerful sound.
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What power supply does the MXR M281 Thump Bass Preamp require?
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The MXR M281 Thump Bass Preamp requires a 9V DC power supply, with a current draw of 9mA.
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Is the MXR M281 Thump Bass Preamp pedalboard-friendly?
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Yes, the MXR M281 Thump Bass Preamp is compact and lightweight, making it easy to fit on most pedalboards without taking up much space.
Videos
jimdunlopusa
MXR Thump Bass Preamp
Reviews
PROS
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Adds the right boost and color to bass parts
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Compact and durable, great for mobile setups
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Controls mid frequencies in a musical way
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Works well with passive basses to enhance tone
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Sturdy build and extremely small, easy to incorporate in setups
CONS
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Requires a specific power supply, not included
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Subtle EQ touch might not meet expectations
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Poor compatibility with fuzz pedals
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Limited tone-shaping options compared to competitors
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Volume matching to bypass signal can cause clipping
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about MXR M281 Thump Bass Preamp.
Comparisons
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Owners find the Sansamp quicker to dial in, with drive features that eliminate the need for mid-sweep, unlike the MXR M81.
Source
Features and functionality
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The MXR M81 is noted for its small footprint and sweepable mids, appealing to those needing precise mid-range shaping.
Source
User experience
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The MXR M81 is considered a reliable workhorse, particularly effective for straightforward FOH applications without an amp.
Source
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