The OBP-3 is Aguilars 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 OR mini-toggle for midrange frequency selection. Includes separate Treble, Mid, and Bass pots, and black mini-toggle switch for Midrange frequency selection. 9 OR 18 VOLT ON BOARD PREAMP. The item "Aguilar OBP-3TK 3 Band Boost/Cut 9 OR 18 Volt On Board Bass Preamp" is in sale since Monday, March 11, 2019.This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "visionguitar" and is located in San Jose, California. This item can be shipped worldwide.