Aguilar OBP-3SK/PP Onboard Bass Preamp

3-band EQ with 18dB of boost/cut at 40Hz, 400 or 800Hz (selectable by push/pull pot), and 6.5kHz, which can be installed as 9- or 18-volt circuit. 1" x 1" x .6". Includes stacked treble/bass pot and push/pull midrange pot.