Gravity EQ15 1/2 Din 5 Band Car Audio Equalizer EQ Front, Rear + Sub Output 9V Perfect bass and equalizer graphics. This unit gives you great value for your money and satisfaction with a perfect music and sound. It will allow you to adjust the frequencies, and the loudness of the mids, highs, and lows coming out of your speakers. The Bass Processor Is simply amazing and it eliminates the need to install a separate epicenter since it is all built in to this one device. Technical Details: Graphic Center Frequencies: 50Hz, 125Hz, 900Hz, 2.2kHz, 16kHz Power Supply: 11-15V DC NEG. Ground Max. Output Voltage: 9V RMS Equalization Range: +-12dB Subwoofer Frequency: 10Hz - 300Hz Input Impedance: 10K Ohms S/N Ratio: 90 dB THD: 0.05 % Channel Separation: 82 dB / 1kHz Frequency Response: 10Hz - 50kHz (-3dB) We have been providing a huge amount of this items to customers. They love them and keep sending us more friends for installs this equalizer as well. We are getting incredibly good feedback from our valued customers.