PROVIDENCE BDI-1 BRICK DRIVE preampWith the carefully picked quality parts and circuit structure specifically designed for bass, it provides more power of expression with low noise. The internal operating voltage is boosted to 21V to achieve more dynamic range. By mixing the drive sound and clean sound through the preamp EQ, it transforms and adds nuance to the overdriven sound. The EQ section was designed based on the Dual Bass Station's circuit. Presence controls the harmonics and