Performance 7Band Sound Equalizer with Integrated Headphone Amplifier Key Features and Benefits: Versatile 3.5mm Input Interface: Designed with a 4pole 3.5mm input jack that supports headsets with builtin microphones, enabling clear voice calls when connected to a mobile phone. Includes an additional terminal interface for flexible audio input options. Precise 7Band Equalization Control: Finetune your audio with a ±12dB control range across seven distinct frequency bands: 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, and 15KHz. Built on TI or TL074 components for reliable, quality performance. Powerful Preamplification: Equipped with a 4580 classic operational amplifier to deliver a 5X gain (14dB), enhancing audio output clarity and strength. Offers an input impedance of 20K and an output impedance of 600 ohm, ensuring signal integrity. Quality Headphone Amplification: Utilizes the NE5532 to create a balanced headphone amplifier via the 47 driver circuit, capable of driving a wide range of headphones with ease. Adjustable output ensures compatibility with different headphone sensitivities. Robust Build for Reliability: Structured with quality audiograde components to maintain consistent performance over time, suitable for both professional and audio setups. Practical Use Scenarios: 1. Mobile Communication Enhancement: Ideal for users who need audio quality during phone calls. The 3.5mm 4pole input allows the use of a headset with a microphone, delivering crisp sound and clear voice transmission. 2. Audio Production and Mixing: for musicians, sound engineers, and content creators who require precise tone shaping across a wide frequency spectrum. The 7band equalizer provides detailed control to achieve the desired sound profile. 3. Listening Experience: For audiophiles who want to maximize their headphone performance. The integrated headphone amplifier drives various headphone types with clear, balanced output, making it suitable for home or studio listening. Specifications Summary: Input Interface: 3.5mm 4pole jack plus terminal interface Equalization Range: ±12dB across 60Hz, 150Hz, 400Hz, 1KHz, 3KHz, 6.5KHz, 15KHz Equalizer Circuit Components: TI or TL074 Preamplifier Gain: 5X amplification (14dB) via 4580 operational amplifier Input Impedance: 20K Output Impedance: 600 ohm Headphone Amplifier: NE5532 with 47 driver circuit Compatibility: Works with a variety of headphones, adjustable amplification height This audio solution offers precision control, strong amplification, and compatibility with both professional audio setups and everyday listening needs.