7Band Sound Equalizer with Performance Preamplifier and Headphone Amplifier Key Features and Benefits: Precise 7band sound equalization for finetuning audio across all major frequency ranges: 60Hz, 150Hz, 400Hz, 1kHz, 3kHz, 6.5kHz, and 15kHz, with a control range of ±12dB. This allows users to optimize sound quality for music, movies, or voice applications. quality preamplifier gain powered by the 4580 classic operational amplifier, delivering up to 5X amplification (14dB) for clear, distortion audio. Ideal for boosting weak signals from audio devices without losing tonal accuracy. Balanced headphone amplifier using NE5532 circuitry within a 47 driver configuration, ensuring stable performance and the ability to drive a wide range of headphone types with adjustable output level. Input impedance of 20K ohms and output impedance of 600 ohms, designed for compatibility with various audio devices and professional setups. 3.5mm input interface supporting a 4pole plug, allowing direct connection to headsets with microphones for seamless mobile phone voice calls. Additional terminal interface for versatile audio connectivity. Equalizer circuit built with TI or TL074 components for dependable signal processing and longterm reliability. Performance Advantages: Enhances clarity and tonal balance across different audio sources. Provides professionalgrade amplification suitable for studio work or home audio improvement. Supports direct plugandplay integration with mobile devices, computers, and external audio gear. Use Scenarios: 1. For musicians or audio engineers needing precise tone shaping during recording or mixing sessions, the 7band equalizer allows exact adjustments to match production requirements. 2. For gamers or mobile phone users, the 4pole 3.5mm interface ensures clear voice communication while maintaining rich sound quality for gameplay or calls. 3. For home audio enthusiasts, the combination of preamplifier gain and headphone driving power enables listening experiences with overear, inear, or studiograde headphones. Specifications: Equalization frequency bands: 60Hz, 150Hz, 400Hz, 1kHz, 3kHz, 6.5kHz, 15kHz Control range: ±12dB Amplification: 5X (14dB) Preamplifier chip: 4580 Equalizer circuit chips: TI or TL074 Headphone amplifier chip: NE5532, 47 driver circuit Input impedance: 20K ohms Output impedance: 600 ohms Interface: 3.5mm (4pole), terminal connection This product combines precise sound shaping, reliable amplification, and broad compatibility, making it a robust solution for professional and everyday audio enhancement.