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Description
MXR M281 Thump Bass Preamp PedalThis pedal combines the tone sweetening magic of the Echoplex Preamp with a three band EQ and midrange frequency adjustment so that you can dial in the perfect bass tone to punch up a solo, boost your signal in a live mix, sculpt more edge into the sound of a passive bass, and more. The MXR Thump Bass Preamp is a tone sweetening, signal boosting, and altogether groove enhancing machine. This pedal was conceived when the MXR design team and Dunlop's in
This pedal combines the tone-sweetening magic of the Echoplex® Preamp with a three-band EQ and midrange frequency adjustment so that you can dial in the perfect bass tone to punch up a solo, boost your signal in a live mix, sculpt more edge into the sound of a passive bass, and more.The MXR Thump Bass Preamp is a tone-sweetening, signal-boosting, and altogether groove-enhancing machine. This pedal was conceived when the MXR design team and Dunlop's 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 8 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.
Specifications
Input Impedance: 1 MΩ
Output Impedance: 100 Ω
Tone Controls
Bass: + 15/-7 dBV, 60 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 (not included)
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Product Reviews
★★★★★ 5
New vitamin
Capsules are not to big and easy to swallow.
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Reviewed in the United States on April 2, 2026
★★★★★ 3
Not impressed
Does not work
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Good purchase
Format: Paperback
Great book for teaching moments with the grandkids! Nice and thick with plenty of pages. Very happy with the quality, too.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Great coloring books
Format: Paperback
These are fantastic for young children..or adults that still take time to color for relaxation
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Reviewed in the United States on February 4, 2026
★★★★★ 5
Well done coloring book
Format: Paperback
Well done coloring book. Nice format and story telling.
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Reviewed in the United States on October 12, 2025