Features 1. Control Range: 7 band equalization circuit control range 12dB, equalization band: 60Hz, 150Hz, 400Hz, 1kHz, 3kHz, 6.5kHz, 15kHz, built with TL074 operational amplifier. 2. Basic Parameters: 7 band sound equalizer preamplification gain, classic 4580 op amp provides 5 times amplification (14dB); input impedance 20K, output impedance 600 ohms. 3. Compatible with Headphones: sound equalizer ear amplifier part composed of NE5532, includes 47 headphone driver circuit, capable of driving various types of headphones, adjustable high and low levels. 4. 3.5mm Interface: 3.5mm input interface supports 4-pole plug, output connects to headset with microphone, compatible with mobile phones for voice calls; additional terminal with RCA interface included. 5. Aluminum Alloy: The 7 band sound equalizer is constructed from aluminum alloy, offering high strength, corrosion resistance, and stable performance. Powered by DC 5V-12V, dual channel o output. Specification Item Type: 7 Band Sound Equalizer Material: Aluminum Alloy Power Supply: DC 5V-12V Interface: 5.5x2.1mm Input Impedance: 20K Output Impedance: 600 Ohms Equalization Circuit Control Range: 12dB Equalization Frequency Band: 60Hz, 150Hz, 400Hz, 1kHz, 3kHz, 6.5kHz, 15kHz Package List 1 x 7 Band Sound Equalizer 1 x Power Supply Cable