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The Darkglass Harmonic Booster is a clean bass preamp that improves the attack of your bass while tweaking the midrange to add a percussive bite. Originally designed as part of a bass overdrive, the team at Darkglass separated the preamp section after realizing their 'harmonic excitation circuitry' sounded great with less gain. The Harmonic Booster has an active 3 band EQ along with a character knob to add additional enhancements.