Aguilar OBP3SKSET 3-Band Stacked Boost/Cut On Board Bass Preamp w/ToggleActive electronics and preamps give you bands of EQ to shape your bass's tone. Using these active EQs lets you find your signature sound directly from your bass. Aguilar sets the standard for aftermarket onboard preamps. The Aguilar OBP 3 runs at 9V or 18V and is the most flexible onboard preamp EQ Aguilar makes. You get three bands with 18dB boost cut at 40Hz, 16dB of boost cut at either 400Hz or 800Hz, and 16dB of boost cut at 6. 5kHz, giving you