MXR M81 Bass Preamp

£179.00 In Stock

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MXR M81 Bass Preamp

RRP £199.99 Save £20.99


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2 Available

Includes 30-Day Exchange & 3-Year Warranty

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Manufacturer's ID: MXR-EFX-M81

The MXR Bass Preamp combines a pristine bass preamp with a studio-quality Direct Out in a Phase 90-sized box, providing clear tone without hogging precious pedalboard space. Use it to add a new voice to an old passive bass, sweeten up any amp, or put some special sauce on a particular song. Dial it in just the way you want it and send it straight to the house-pre or post-EQ-with the built-in Direct Out.

The Bass Preamp features separate INPUT and OUTPUT level controls and a 3-band EQ section with sweepable midrange-from 250hz to 1khz-for extensive tonal flexibility. It's all delivered super clean with high headroom thanks to our own Constant Headroom Technology, and you can use the PRE/POST EQ switch to set whether or not your Direct Out signal is affected by the Bass Preamp's EQ section. And of course, the Bass Preamp features a GROUND LIFT switch in case you encounter ground loop hum.

The Bass Preamp is factory preset to operate in 1/4" out buffered bypass and Direct Out active. For players who only want to use the 1/4" out, there are two internal switches that disable the Direct Out and 1/4" out buffered bypass for true 1/4" out bypass mode.


  • Separate controls for input and output
  • Parametric mids
  • Pre / Post switch determines whether the EQ will take effect before or after the Direct Out
  • Controls for Output, Mid Freq., Input, Bass, Mid and Treble
  • Pressure switch for ground lift
  • 2 Internal switches control the use of the Direct Out and a True Bypass can be switched
  • Status LED
  • 6.3 mm Jack inputs and output
  • XLR output
  • Operates on 9V battery or optional AC adapter (Not Included)

Customer reviews

Overall Rating 5/5 (1 reviews)

Steve B. - 20/8/2018