Feature: 1. 7 Adjustable Bands: Chassis graphic equalizer with built in low pass filter, 7‑band graphic equalizer (50Hz, 125Hz, 315Hz, 750Hz, 2.2KHz, 6KHz, 12KHz). 2. Characteristic: 7‑band car audio graphic equalizer with variable gain adjustment and high level speaker input, very practical in use. 3. With Control Volume: Car audio graphic EQ includes light independent main volume and subwoofer control volume with volume controller. 4. EQ Parameter: Subwoofer frequency is 35‑250HZ, signal to noise ratio is 90dB, channel separation ratio is 70dB and frequency response is 15Hz‑30KHz (‑3dB). 5. Front Rear Sub Output: Car audio equalizer EQ, front, rear and subwoofer output, Includes mounting brackets and screws for easy installation. Specification: Item Type: Car Audio Graphic Equalizer Material: Metal Voltage: 11-15V DC Pre Image Frequency: 50Hz, 125Hz, 315Hz, 750Hz, 2.2KHz, 6KHz, 12KHz Equalization Range: ±18dB Subwoofer Frequency: 35-250HZ Input Impedance: 10K OHMS Signal To Noise Ratio: 90dB THD: 0.05% Channel Separation Ratio: 70dB Frequency Response: 15Hz-30KHz (-3dB) Application Range: Universal. Package List: 1 x Car Audio Graphic Equalizer1 x Manual4 x Screw2 x Accessories