Feature 1 CONTROL RANGE: The 7 band equalizer circuit has a control range of 12dB. equalization bands: 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, 15KHz, by TI or ST TL074. 2 BASIC PARAMETERS: 7 band sound equalizer preamplifier gain, 4580 classic op amp provides 5x amplification (14dB); input impedance is 20K, output impedance is 600. 3 COMPATIBLE HEADPHONES: The ear amplifier part of the sound equalizer consists of NE5532 type 47 headphone driver circuit, easy to drive various types of headphones, adjustable high and low, with sound cable. 4 3.5MM INTERFACE: 3.5mm input interface supports 4 pole plug, the output terminal connects to a headset with microphone, which can be used for normal voice calls on a cell phone, and the other terminal has a Qunlian interface for choice. 5 ALUMINUM ALLOY MATERIAL: The 7 band car sound equalizer is made of aluminum alloy, high strength, stable performance, DC 512V power supply, dual channel sound.Item Type: 7 Band EqualizerProduct Material: Aluminum AlloyColor: BlackPower Supply: DC 512VInterface Specification: Approx. 5.5x2.1mm / 0.2x0.1inEqualization Circuit Control Range: 12dbEqualization Band: 60HZ, 150HZ, 400HZ, 1KHZ, 3KHZ, 6.5KHZ, 15KHZ Package List1 x Equalizer1 x Adapter1 x Sound Cable