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 ¼” out buffered bypass and Direct Out active. For players who only want to use the ¼” out, there are two internal switches that disable the Direct Out and ¼” out buffered bypass for true ¼” out bypass mode.

  • Separate INPUT & OUTPUT level controls
  • 3-band EQ section with sweepable midrange
  • Studio-quality Direct Out
  • Input Impedance : 2.2 MΩ
  • 1/4” Output Impedance : 300 Ω, 40 Hz 
  • Balanced Output Impedance :120 Ω, 40 Hz
  • MPN : M81-U
  • UPC : 710137072770

Audio MIDI Plus is committed to deliver the best experience for our customers. If for some reason you are not satisfied with your purchase, you may return it for a refund of the purchase price, an exchange or a store credit within 30 days from the ship date. 

In the unlikely event that you received a defective product, a wrong product, or damaged product, Audio MIDI Plus will replace it at no charge of any additional shipping cost. We will send you a prepaid label to return the item, and ship you a replacement. You will not incur any shipping charges. Please notify us of any of damaged, defective or misshipped products within 14 days.

After 30 days, you may request manufacturer warranty if your item malfunctions. Unless otherwise specified, Audio MIDI Plus is an authorized dealer for all the brands we represent.

How to request a return:
Please email us or call us to obtain a RMA number. All returns must be in a re-sellable condition and include all packing materials, accessories and paperwork. We may apply a restocking fee if the returned products fall into these following categories:

  • Missing original packaging, manuals, accessories, or any contents that was included
  • RMA number was not associated with the return
  • Items not in original like new condition

Please send all returns to:
Audio MIDI Plus Returns
3725 Saddle Drive,
Carlsbad, CA 92010

The following items are not returnable, unless received DOA, in which we will send a replacement:

  • Software
  • Electronic Delivery of Software
  • Special orders
  • DVD’s

Items that fall into the in mouth and in ear use category, such as mouthpieces, earphones, ear plugs, harmonicas, cannot be returned due to health regulations

Thank You for shopping with us!

If your item is eligible for shipment outside of the United States, Tax, Duty, and/or VAT and brokerage fees are the buyer's sole responsibility. Please check with your local authorities to assess these extra fees.

Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.

International Friends: If you refuse a delivery due to Tax and/or Duty, we reserve the right to refund you only when the package is successfully returned back to us, and MINUS all shipping charges

Most software items are now Electronic Delivery Only. Once payment is received, we will Email you the necessary codes and/or download links. Please be sure to check your junk mail and spam folders for this Email.

While most items are in stock either in our retail store or fulfillment warehouse in Carlsbad, CA, in some cases items may need to be ordered and/or drop shipped from the manufacturer. Please allow 3-10 days for order processing, fulfillment, and setup, as well as transit and delivery time. Tracking will be available within 48 hours in most cases.

Please call us at (844) 577-4502 10AM-6PM PT M-S for an IN-HAND description of the item that you are interested in. We are always happy to help, and look forward to speaking with you if needed. Live Skype may also be available for you.

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