MXR Bass Preamp

This new exciting MXR Bass Preamp combines a pristine bass preamp with a studio-quality Direct Out in a Phase 90-sized box, giving clear tone without hogging precious pedalboard space. 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. The 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.The primary feature of the this new exciting MXR M81 is its 3-band EQ with sweepable midrange. The real bass and treble controls are voiced quite nicely, providing fullness that doesn’t muddy the tone and highs that aren’t harsh. Unless you obsess over midrange at Billy Sheehan-like levels, the mid and mid-frequency controls are very user-friendly, and allow a bassist to boost or mellow out the bumps, honks, and clacks of this sonic spectrum. 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. With Run a cable from your bass to the Bass Preamp’s INPUT jack and another cable from the Bass Preamp’s 1/4” OUTPUT jack to your amplifier. The default setting is DIRECT OUT ‘ON’ Mode. To use the Direct Out function, run a balanced line (XLR cable) from the Bass Preamp’s DIRECT OUT jack to your mixing board or PA. to Setting of all the controls to their 12 o’clock position. With Turning the pedal on by depressing the footswitch. The Rotation of OUTPUT of control clockwise to increase overall volume or counterclockwise to decrease it. The Rotation INPUT of knob clockwise to increase Pre-EQ gain or counterclockwise to decrease it. The Rotation of BASS knob clockwise to boost low end frequencies or counterclockwise to cut them. The Useage of MID FREQ control to select midrange frequency to be affected by MID control. To Rotating the MID control clockwise to boost midrange or counterclockwise to cut it. Rotating the TREBLE control clockwise to boost high end frequencies or counterclockwise to cut them. DIRECT OUT ‘ON’, push in the PRE/POST switch to allow your Direct Out signal to be affected by INPUT, EQ and OUTPUT controls. When PRE/ POST switch is ‘out,’ your Direct Out signal will be unaffected by these controls.