Microtubes B7K Ultra 2 W/Aux input

Sale priceCAD$619.95
1 unit left, ready to be shipped


Design and Tone. Perfected. 

The upgraded Microtubes B7K Ultra with Aux in features: (1) Single user loadable cabinet simulation impulse response. (2) Micro-USB B port to connect to PC/Mac to load a different Virtual Cabinet through the Darkglass Suite. (3) 3.5mm headphone output with cabinet simulation. (4) Balanced XLR output with switchable cabinet simulation. (5) A 3.5mm stereo input that allows you to practice with backing tracks from e.g. your smartphone or laptop.

Front Features


Whereas the Level Knob controls the output of the overdrive section the Master volume adjusts the overall volume of the unit. Ideal for fine tuning the output on clean mode. It also serves as a DI level control. 


Mixes the clean input signal with the overdriven signal. The clean signal remains at unity gain while the volume of the overdriven signal is set by the Level knob, allowing for fine control of the blend ratio. 


Sets the volume of the overdriven signal. 


Sets the amount of saturation in the overdriven signal. 

Attack Switch

Sets the amount of treble content to saturate: The “Boost” setting emphasizes the treble content extra clarity and presence. The “Flat” position leaves this register untouched while the “Cut” position will reduce the amount of high frequencies being saturated.

Grunt Switch

Sets the amount of low frequency content to saturate by selecting between three different bass boost levels before the clipping stage. 


+-12dB @ 100Hz 

Lo Mids

+-12dB switchable 250Hz, 500Hz and 1kHz 

Hi Mids

+-12dB switchable 750Hz, 1.5KHz and 3kHz 


+-12dB @ 5kHz 

Hi Mids

+-12dB switchable 750Hz, 1.5KHz and 3kHz 


+-12dB @ 5kHz

Darkglass Suite 

Utilizing the desktop version of the Darkglass Suite allows you to load one of the available impulses responses of our library or add you custom / third party impulses to use with your pedal. In addition you can control the headphones level output.

Input & Outputs


Connect your instrument or output from your pedal board to the ¼” mono jack.


Aux In

This 3.5mm stereo input allows you to practice with backing tracks from e.g. your smartphone or laptop. Auxiliary input can only be used with the headphone output.

The pedal does not control the level, it must be set from your audio source. Remember to always first set the level low before connecting anything to the aux in! 

Headphone Output

B7K Ultra has an internal stereo headphone amplifier capable of driving a minimum load of 16 ohms from the 3.5mm stereo jack. Use the Master volume control to adjust the level.


Only use a regulated 9V DC adapter with a center-negative plug. 


Connect from the ¼” Output jack to the input of your amplifier or another effects pedal. 

Direct Output

Balanced XLR output for connecting the pedal to a microphone preamp, PA system etc. 

Ground lift

Disconnects the signal ground on the Direct Output to break any ground loops. Set this switch to either position that has less noise. The switch does not affect the ¼” output.

Cab Sim

Toggle the cabinet simulation on/off on the Direct Output. This switch completely bypasses all digital circuits and allows you to get a zero latency signal when needed. 


A Micro USB B connector allows you to connect the pedal to PC/Mac to load cabinet simulation impulse responses to the pedal and control various other settings.

Video Review: Microtubes B7K Ultra 2 W/Aux input


Brand Darkglass Electronics
Weight (kg) 0.43 kg
Width (cm) 9.5
Length (cm) 12.5
Height (cm) 5.7
Battery No
Expression No
Jacks position on top No
Switching presets No
Power Supply 9 Volt
Tap tempo No
Bypass Buffered bypass
Digital or Analog Analog
Current Draw, mA 120
Input Impedance, kΩ 1000
Output Impedance, Ω 1000
Best For Bass Guitars

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