Darkglass Tone Capsule Bass Preamp

Darkglass Tone Capsule Bass Preamp, Onboard Bass Preamp, Provides the transparency of the Microtube B7K EQ as a built-in pre-amp, Control: Bass + -12 dB @ 70Hz - Mids: + -12 dB @ 500Hz - Hi Mids + -12 dB 2.8kHz, Including potentiometer, The Tone Capsule can be used with one or two batteries in series for 9 V or 18 V operation (battery clips not included) ...