Aguilar OBP-3TK/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 can be installed as 9 or 18 volt circuit. 1" x 1" x .6". Includes separate treble, bass, and push/pull midrange pots.