Kowalski plugs his bass directly into a Sonic Research Turbo Tuner, which feeds a Radial J48 Active Direct Box. The J48 sends the signal to the front of house and a Bass BB Preamp that feeds his Ampeg. The BB stays on most of the time to add a bit of grit and punch, and a Voodoo Lab PP2 powers it all. When Kowalski isn’t smacking his bass with his thumb, he picks with Dunlop .88 mm Tortex Standards.