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LEVEL is the master output level and it controls the amount of signal provided to the host amplifier, GAIN determines the amount of gain (overdrive) in the signal path, TONE This provides simple, global adjustment of the entire range of frequencies with one control, DIP SWITCH is a selectable EQ Voicing Switch located in the lower right edge of the bottom circuit board inside the unit under the Bottom Plate. Removing the Bottom allows access to this switch offering you two EQ curves. Select either a Mid-Scooped EQ response that excels at Rock Chording with the EQ ON setting (as Shipped) or a flatter, punchier, more equally balanced response that retains the Midrange frequencies and fills in the sound with the EQ OFF. The latter can be effective for single note soloing, especially at lower gain settings where you may want more focus, definition and body. Again, the unit is shipped set to the EQ ON/Mid-scooped position. Push the dip switch toward the Left to remove EQ circuitry and obtain midrange balance and a more even response.


True Bypass On/Off Switching - Bypasses all circuitry when off to ensure no tonal loss,

LED Indicators

On/Off Status LED

Power Requirements

9V Battery Powered or optional AC Powered via External Power Jack Input. WARNING!!! To avoid immediate damage and voiding the warranty, the External Power Supply MUST be 9VDC with a NEGATIVE CENTER plug polarity and a jack plug size of 2.1mm x 5.5mm.

Current Draw


Input Output Jacks

Input & Output Jacks (Nominal Input -20 db)

Input Impedance

1M Ohm (500k Ohm minimum)

Output Impedance

10k Ohm

Switching Type

True Bypass


4.77 x 2.87 x 2.31



Disclaimer: In order to continually improve the design, quality and performance of our products and to use the best materials at all times, MESA/Boogie reserves the right to substitute or change specifications (including parts or coatings) without notice.



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