The 2-Band Boost/Cut Onboard Preamp with Stacked Treble/Bass Pot from aguilar was designed to give bassists fat tone while being small enough to fit into tight control cavities. Wire this preamp with two 9-volt batteries and it will fit into just about any instrument. With +/-18 dB of boost and cut at 40 Hz and +/-16 dB of treble boost and cut at 6.5 kHz, you can emphasize just the right frequencies to make your bass sound great in any mix.