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Darkglass Microtubes B7K V2 Bass Preamp Pedal

Bass Preamp Pedal and DI Box with Overdrive, 3 x Outputs, and 2 x Mid Selection Buttons
$349.99

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Bass Preamp Pedal with Deep Tone Editing

The Microtubes B7K V2 bass preamp pedal from Darkglass Electronics is so much more than an excellent DI. It's also a pedal-sized preamp and aggressive-sounding drive. The Microtubes B7K V2 employs the same dynamic saturation circuit and 4-band EQ and balanced line driver that has put Darkglass on thousands of bassists' boards. Yet, the addition of two mid-frequency selector switches, as well as the Grunt and Attack controls give the V2 unparalleled tonal shaping abilities. And dual outputs make parallel processing and running your signal to a PA or mixing console a piece of cake.

Deep Tonal Sculpting

The Microtubes B7K V2's 4-band EQ is powerful enough to place it on many Sweetwater bassists' board. But Darkglass has upped the game with their helpful Attack and Grunt switches, fine-tuning the pedal's character. But that wasn't enough tonal tweaking for the engineers at Darkglass. The V2 boasts two carefully voiced mid frequency buttons that determine which mid frequencies are being affected. Whether you're looking to pull the mids back for top-end attack and a huge bottom, or wanting to push them for a punchier tone, the Microtubes B7K V2 nails it.

Darkglass Electronics Microtubes B7K V2 Bass Preamp Pedal Features:

  • Bass preamp pedal and DI box with saturation circuit
  • 4-band EQ for shaping your tone
  • Two mid-frequency selector buttons determine what mid frequencies are being affected
  • Level knob sets the volume of your overdriven signal
  • Drive knob controls the amount of saturation in your overdriven signal
  • Blend knob adjusts the ratio between clean and overdriven signals
  • Grunt switch dials in the amount of low-frequency saturation
  • Attack switch tunes in the amount of high-frequency saturation
  • Parallel output for parallel processing
  • Direct output for running into PA systems and mixing consoles

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Tech Specs

  • Type: Preamp, Overdrive
  • Form Factor: Pedal
  • Inputs: 1 x 1/4"
  • Outputs: 2 x 1/4" (main out, parallel out), 1 x XLR (direct out)
  • Power Source: 9V DC power supply (sold separately)
  • Power Usage: 30mA
  • Height: 1.77"
  • Width: 4.21"
  • Depth: 4.72"
  • Weight: 0.78 lbs.
  • Manufacturer Part Number: B7K2

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Customer Reviews

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Rated 5/5

Excellent for what I use it for.

So this is a little difficult to review because where it fails as a preamp (for my needs), it makes up for in another area.

Preamp: I bought this to replace my Darkglass Harmonic Booster clean preamp. You can use this as a clean preamp, but you lose a lot of tone control features such as the mids (the reason I purchased this), mid frequencies, and the high and low boosts. If you want access to these features, you need to blend in the level. Even with the drive at 0, there will be some dirt added to your signal (which I didn't want).

Distortion: I did place this in my signal chain as a dirt pedal and ended up replacing my MXR Bass Distortion. The dirt, grit, and tone control is amazing. But I would suggest the BK3 if all you're looking for is distortion.

Overall, if you want dirt (which sounds beautiful) in your signal this is an incredible preamp. If you're looking for a clean preamp, you'll be paying for a lot of EQ sculpting features you will not be able to use. As a distortion pedal, you have so much control of your tone plus options of throwing your signal out as both clean and dirty.
Music background: Experienced
Rated 4.5/5

Not just for metal...

This pedal is not only great for super aggressive sounds! You can get some nice lower-gain drive out of it as well. If you get it, really spend some time with it and play it in a mix with other instruments to give it a fair shake. If you want to hear some (non-dingwall lol) sounds with this guy, check out my video review below.
Rated 5/5

Darkglass Microtubes BK7

I've had the DG Microtubes BK7 (V1) for many years now and its an indispensable pedal for me. When I got back into playing metal after a few year hiatus due to a wrist injury I wanted to reshape my sound. I hadn't run distortion before getting this pedal and was leery about getting a muddy mess of a sound. After some research I found the Darkglass makes bass gear, for bass players. Not just some guitar pedal with the word "bass" printed on it. Being able to blend the clean signal with the distortion, and the level of refinement in the distortion circuit gives you so much range. Originally this was my only distortion source in my chain and I could get a crushing, punchy sound with just this pedal. A few years ago I bought the Darkglass Alpha-Omega 900W head to replace my aging Ampeg 400w. After dialing in the A-O's build in distortion I thought I would place the BK7 on a shelf to collect dust. I decided to play around with it in the effects loop and after a while I found a tone I love! It went from the meat and potatoes of my distortion sound to the icing on the cake. Whatever your needs are, from light tone shaping to all out crushing distortion, this pedal can deliver.
Music background: Metal
Rated 5/5

Amazing bass preamp

Does everything you need direct out is nice
Rated 5/5

Love this!

I was first amazed by how quickly it had arrived. And with someone keeping in touch with me throughout the entire shipping process also amazed me. Hands down best customer service I have ever experienced with an online purchase! As for the pedal, it's what I expected it to be. All I could ever want and more. 100% satisfied with this!
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