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Microtubes B1K

CMOS Bass Overdrive

Controls (Front)

Level

: Sets the volume of the overdriven 

signal.

Drive

: Sets the amount of saturation in 

the overdriven signal.

Controls (Back)

Open the magnetic bottom lid to access 
the controls.

Blend

: Mixes the clean input signal with 

the overdriven signal. The clean signal is 
fixed at unity gain, while the volume of 
the overdriven signal is set by the Level 
knob, allowing for fine control of the 
blend ratio. Turn clockwise to blend in 
the clean signal.

Tone

: Controls the high frequency 

content of the sound. A variable low pass 
filter from 3 kHz to 8 kHz. Turn CCW for a 
brighter sound.

DIP switches

Grunt

: Provides a low-end boost to massively thicken your sound when 

engaged.

MBoost

: Gives a subtle 6 dB boost from 300 Hz to 1 kHz to help you cut 

through the mix.

Technical Specifications 

Input Impedance 1 MΩ  
Output Impedance 1 kΩ
Current Consumption ~30 mA 
Voltage 9V DC (Center Negative) 

Dimensions 

Width 50 mm (2 in) Height 100 mm (4 in) Depth 45 mm (1.75 in)
Weight 205 g (0.45 lb) 

Warning

The Microtubes B1K has a current draw of 30 mA. Only use a regulated 
9V DC adapter with a center-negative plug. Due to ecological reasons it 
does not accept batteries. Unregulated power supplies and/or higher 
voltages may result in suboptimal noise performance and even damage 
your unit, voiding the warranty.

GRUNT ON

GRUNT OFF

MBOOST ON

MBOOST OFF

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