Jim Dunlop MXR M81 Bass Preamp | Bass Guitar Effect Pedal

Jim Dunlop MXR M81 Bass Preamp | Bass Guitar Effect 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.

• Combines a pristine bass preamp with a studio-quality Direct Out so you can adjust your sound to any live or recording scenario
• High headroom input and output level controls for distortion-free signal
• 3-band EQ section with sweepable midrange dials in whatever you need
• Switchable pre/post EQ direct out – get the right tone for your amp and the room
• Buffered bypass/True bypass switchable for even greater versatility
• Can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick, Iso-Brick, and Mini Iso-Brick power supplies (not included)
• OUTPUT knob controls overall volume
• GROUND LIFT switch engages a Direct Out ground lift
• MID FREQ knob selects midrange frequency to be cut or boosted by MID control
• PRE/POST switch determines whether or not the Direct Out signal is affected by control settings
• INPUT knob controls Pre-EQ gain
• BASS knob controls how much low end is cut or boosted
• MID knob controls how much of midrange freq is cut or boosted
• TREBLE knob controls how much high end is cut or boosted
• FOOTSWITCH toggles effect on/ bypass (blue LED indicates on)