The Aguilar OBP3TKSET 3-Band Boost/Cut Onboard Preamp, Separate 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 or 800 Hz and ±16 dB of treble cut and boost at 6.5 kHz. Supporting 9 or 18 volts, the OBP3TKSET has multiple wiring options, and is wired with a black toggle switch for midrange frequency selection.