Dunlop MXR M81 Bass Preamp Pedal

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. 

SPECIFICATIONS

• Input Impedance 2.2 MΩ 1/4”
• Output Impedance 300 Ω, 40 Hz
• Balanced Output Impedance 120 Ω, 40 Hz
• Maximumm Output Level +22 dBV
• Noise Floor* -98 dBV THD 0.025%, 1 kHz
• EQ Controls Bass ±18 dB, 40 Hz
• Mid ±17 dB, 250 Hz to 1 kHz
• Treble ±18 dB, 4 kHz
• Input Control Pre EQ, ±10 dB
• Output Control Post EQ, +20 dB, -50 dB
• Bypass** True Hardwire Buffer Current Draw 8.25 mA
• Phantom Power Current Draw 4.7 mA
• Power Supply 9 volts DC
• Separate INPUT & OUTPUT level controls
• 3-band EQ section with sweepable midrange
• Studio-quality Direct Out