With the Darkglass Electronics Microtubes B7K v2 Bass Preamp, you’ll get all the features of the original B7K, along with the ability to better sculpture your tone: you get the option to change the center frequency from 1 kHz to 500 Hz on the low mids, and the option to change the center frequency from 3 kHz to 1.5 kHz on the high mids. This will allow you to tailor your absolute dream distortion tone.