*7 Band Car Graphic Equalizer Adjustable Frequency High Level Speaker Input Fron

It features a signal to noise ratio of 90dB, a channel separation ratio of 70dB, and a frequency response range of 15Hz to 30KHz (-3dB). Front and Rear Subwoofer Output: This car equalizer provides front, rear, and subwoofer outputs, allowing you to fine tune performance in different areas of the vehicle.

eBay