MXR M 81 Bass Preamp
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MXR
M 81 Bass Preamp
Product Info
* Prices may vary. Check retailer for current pricing and availability.
The MXR M 81 is a seriously useful little box for bassists. It’s got a clean DI out for recording or live sound, plus a flexible EQ section that lets you really dial in your tone. It’s a great option for gigging bass players who need a reliable preamp and DI in one pedal, especially those wanting to shape their low-end.
Product Description
- MXR M 81 Bass Preamp
- Combination of Preamp and DI Box for Electric Bass
- 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 (article nr #409939#
- not included)
PROS
- • Excellent EQ flexibility with parametric mids for precise shaping
- • DI output is clean and robust, a great stage solution
- • Solid MXR build quality; feels durable and ready for touring
- • Input/Output controls allow for gain staging and level matching
CONS
- • Can be a bit bulky for smaller pedalboards or gig bags
- • Mid-frequency control range might be limited for some tonal needs
- • Battery operation isn't ideal for long gigs; AC adapter recommended
Product Video
Key Features
Effect Type
Bass Preamp & DI
Controls
Output, Mid Freq., Input, Bass, Mid, Treble, Pre/Post
Bypass Type
True Bypass
Power Supply
9V Battery or AC Adapter
Connections
6.3 mm Jack (Input/Output), XLR Output
Dimensions
4.75 in x 2.75 in x 1.75 in
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Frequently Asked Questions
Switching to 'Post' means the EQ affects the DI signal, allowing you to shape your tone directly at the front-of-house mixer.
Yes, the XLR output is balanced, which minimizes noise and hum over longer cable runs – perfect for stage setups.
The M81 leans towards a clean, modern sound; it's not going to give you a vintage warmth like some other units, but it's extremely versatile for a wide range of genres.
