he OBP-3 is Aguilar's most flexible onboard preamp design, providing +/-18dB of cut and boost at 40Hz, +/- 16dB of cut and boost at either 400Hz or 800Hz and +/- 16dB of treble cut and boost at 6.5 kHz. The OBP-3 has multiple wiring options, and can be wired with either a push/pull pot, mini-toggle or internal dip-switch for midrange frequency selection. Low noise discrete FET input stage, center detent 50 K linear pots, with a dual concentric pot is also available. And with 324 hours of battery life -- that's two weeks of non-stop, continuous jamming -- so you'll be sure the OBP-3 won't die on you any time soon!