Fangrui Product Details 1. Control Range: Control Range Of 7-band Equalization Circuit Is 12db. Equalization Frequency Band: 60hz, 150hz, 400hz, 1khz, 3khz, 6.5khz, 15khz, Composed Of Ti Or St Tl074. 2. Basic Parameters: 7-band Sound Equalizer Preamplifier Gain, 4580 Classic Operational Amplifier Provides 5x Amplification (14db); The Input Impedance Is 20k, And The Output Impedance Is 600 . 3. Adapting Earphones: The Ne5532 Constitutes The Balanced Earphone Amplifier Of The 47 Earphone Driver Circuit, Which Can Easily Drive Various Earphones With Adjustable Height. 4. 3.5mm Interface: The 3.5mm Input Interface Supports A 4-pole Plug, And The Output Is Connected To A Headset With A Microphone, Which Can Be Used For Normal Voice Calls On The Mobile Phone. In Addition, There Is A Terminal Of Rca Interface. 5. Aluminum Alloy Material: 7-band Audio Equalizer Is Made Of Aluminum Alloy, With High Strength, Corrosion Resistance, Stable Performance, Dc5v - 12v Power Supply, Dual Channel Sound. It Is Widely Used In Home/car Audio/mob