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MXR M81 Bass Preamp Pedal , $189.99 - Add to Cart Skip to Product Information

MXR M81 Bass Preamp Pedal

Bass Preamp Pedal with XLR Direct Out, 3-band EQ, and Level Controls
MXR M81 Bass Preamp Pedal
MXR M81 Bass Preamp Pedal

Backordered - More On The Way!

We expect more from MXR in just a few days. Order today to reserve yours now, risk-free. Estimated by September 4.

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MXR M81 Bass Preamp Pedal
Backordered - More On The Way!

We expect more from MXR in just a few days. Order today to reserve yours now, risk-free. Estimated by September 4.

MXR Bass Innovations Preamp Pedal

This article was Written By

Our Product Research Team

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For studio-quality bass tones wherever you play, rely on the MXR M81 Bass preamp pedal. Separate input and output level controls let you take advantage of MXR's innovative Constant Headroom Technology for clarity at volumes other preamps just can't produce. The flawless direct out can be sent to the house pre or post the 3-band, sweepable midrange EQ section - dial in tone for your amp and leave the PA to the sound chick. To get a new tone from an old bass or amp, or for just a touch of something every now and then, the versatility of the MXR M81 Bass preamp pedal is what you need.

Dunlop legacy and MXR

Dunlop Manufacturing started in 1965 much like Sweetwater, a family-owned and operated company. In 1972 Dunlop introduced the MXR pedals and quickly established themselves as pioneers in the guitar effects pedal market. Their continuing innovations are highly-acclaimed, winning multiple awards with their Bass Innovations line and presenting the guitar-playing world with new classics like the Carbon Copy delay pedal. The MXR Custom Shop delivers you the classic MXR pedals made from original specs and gives you a touch of 'boutique' with special runs of guitar effects pedals. Sweetwater is proud to partner with Dunlop to give you the best MXR has to offer!

MXR M81 Bass Preamp Pedal Features:
  • Switchable pre/post EQ direct out - get the right tone for your amp and the room
  • High headroom input and output level controls for distortion-free signal
  • 3-band EQ section with sweepable midrange dials in whatever you need
  • Buffered bypass/True bypass switchable for even greater versatility
  • Operates on 9V battery, optional power supply, pedalboard power, or phantom power from your mixer
Put award-winning tone at your feet with MXR Bass Innovations pedals!

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage

Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.