Alpine 3656 Active Dividing Network -

An Active Dividing Network is used in your vehicle which would be connected to you amplifier which would manually allow you to adjust and modify your sound, if you imagine an EQ it that but more in-depth. It allows you to adjust the bass and treble whilst also allowing you to adjust the front, rear, low, mid, high and subwoofer This is a great item if you have a subwoofer and amplifier installed in your vehicle and will enhance your sound a great deal.