1. Specifications: - Project type: 7 - band audio equalizer - Material: Aluminum alloy - Power supply: DC 5V - 12V - Interface specification: 5.5x2.1 - Input impedance: 20K Ω - Output impedance: 20K Ω - Equalizer circuit control range: ±12 dB - Equalizer frequency bands: 60HZ, 150HZ, 400HZ, 1KHZ, 3KHZ, 6.5KHZ, 15KHZ 2. Features: - The control range is ±12dB. The equalizer frequency bands are 60HZ, 150HZ, 400HZ, 1KHZ, 3KHZ, 6.5KHZ, 15KHZ, and it is composed of TI or ST original TL074. - Main parameters: The pre - amplifier gain of the 7 - band audio equalizer. The classic 4580 operational amplifier provides a 5 - fold gain (14dB); the input impedance is 20K, and the output impedance is 600 ohms. - Compatible with headphones: The earphone amplifier part of the NE5532 audio equalizer forms a type 47 headphone drive circuit, which can easily drive various types of headphones, and the treble and bass are adjustable. - 3.5mm interface: The 3.5mm input interface supports a 4 - pole plug. The output is connected to a headphone with a microphone and can be used for normal voice calls on a mobile phone. There is also a terminal with a set of RCA connectors at the other end for selection. - Aluminum alloy: The 7 - band car audio equalizer is made of aluminum alloy, which has high strength, corrosion resistance, stable performance, is powered by DC 5V/12V, and has dual - channel sound. 3. Packaging list: - 1 x 7 - band audio equalizer - 1 x Power cord