Jim Dunlop MXR M281 Thump Bass Preamp Effect Bass

CONTROLS
1. OUTPUT knob sets output level of effect
2. TREBLE knob boosts or cuts high end frequencies at 4 kHz
3. MID knob boosts or cuts midrange as set by FREQUENCY knob
4. BASS knob boosts or cuts bass frequencies at 40 Hz
5. FREQUENCY knob sets midrange frequency from 250 Hz to 1 kHz
6. FOOTSWITCH toggles effect on/bypass (blue LED indicates on

DIRECTIONS
• Run a cable from your instrument to M281’s INPUT jack and another cable from M281’s OUTPUT jack to your amplifier.
• Start with all controls at 12 o’clock.
• Turn the effect on by depressing the footswitch.
• Rotate OUTPUT knob clockwise to increase volume or counterclockwise to decrease it.
• Rotate TREBLE knob clockwise to boost high end frequencies or counterclockwise to cut them.
• Rotate FREQUENCY knob clockwise for a higher midrange frequency center or counterclockwise for a lower midrange frequency center.
• Rotate MID knob clockwise to boost midrange frequencies or counterclockwise to cut them.
• Rotate BASS knob clockwise to boost low end frequencies or counterclockwise to cut them.
SPECIFICATIONS
• Input Impedance 1 MΩ
• Output Impedance 100 Ω
• IMPEDANCE
• TONE CONTROLS
• Bass + 15/-7 dBV, 40 Hz
• Mid ±16 dBV, 1 kHz
• Treb ±10 dBV, 4 kHz
• Freq Sweep 250 Hz to 1 kHz
• Noise Floor -95 dBV
• Bypass True Hardwire
• Current Draw 9 mA
• Power Supply 9 Volts DC