1、Control Range: 7 band equalization circuit control range ± 12dB, equalization band: 60HZ,150HZ,400HZ,1KHZ,3KHZ,6.5KHZ,15KHZ, by TI or ST original TL074 composition. 2、Basic Parameters: 7 band sound equalizer preamplification gain, 4580 classic op amp provides 5 times amplification (14dB); input impedance 20K, output impedance 600 ohms. 3、Compatible with Headphones: sound equalizer ear amplifier part of the NE5532 composed of type 47 headphone driver circuit, easy to drive all types of headphones, adjustable high and low. 4、3.5mm Interface: 3.5mm input interface supports 4 pole plug, the output connects to the headset with a microphone, which can be used on cell phones for normal voice calls, and another terminal with a group lotus interface is available. 5、Aluminum Alloy: The 7 band car sound equalizer is made of aluminum alloy, high strength, corrosion resistance, stable performance, DC5V‑12V power supply, dual channel sound.