The 3-Band Boost/Cut Onboard Preamp with Stacked Treble, Mid, and Bass Pots is aguilar's most flexible onboard preamp design, providing +/-18 dB of cut and boost at 40 Hz; +/- 16 dB of cut and boost at either 400 Hz or 800 Hz; and +/- 16 dB of treble cut and boost at 6.5 kHz. This preamp is wired with a push/pull for midrange frequency selection.