Used to adjust amplifiers power level, stereo, equalizer or crossover volume from the dashboard or other remote locations.
Two adjust way: adjust by gain, adjust by frequency. Different frequency can make the song feel different.
Adds subwoofer level controls or balances a multiple amplifier installation.
Just need to rotate the button of the controller, easy operate.
Universal fit for most of car, simple in and out connection, no additional wiring need.