Rockville PPA20 Preamp Professional 1U Rack Mount Pre-Amplifier w/Crossover+EQ, Black

Low Cut Switch allows you to cut off certain frequencies which comes in handy when using turntables, subs, and other gear. This function will allow you to play your music louder, with lower distortion and make your speakers last longer. Treble / Bass control. Loudness compensation circuit which at low-to-medium volume boosts the bass and treble response. Tape Monitor . Ground lift switch