Key benefits — why you need this home audio equalizer Precise tone control: 7-band equalization with ±12 dB range and multi-frequency bands lets you shape bass, mids and treble accurately to match room acoustics and source material. Improved clarity and level control: Built-in pre-amplification provides 5× gain to raise low-level signals without adding external equipment. Reliable compatibility with mobile headsets: 3.5 mm input that supports 4-pin plugs and an output that works with headphones with a microphone preserves normal voice call functions on smartphones. Durable, stable performance: Robust aluminium alloy housing resists corrosion and provides long-term mechanical stability for home use. Key features and specifications Equalization: 7-band, multi-frequency bands, control range ±12 dB for precise tonal shaping. Op-amps: Circuit uses TI or ST Original TL074; classic operational amplifier 4580 included in the signal path. Pre-amplifier: Provides 5× (five times) amplification to raise signal levels before equalization. Impedance: Input impedance 20 kΩ; output impedance 600 Ω. Channels & power: Dual-channel (stereo) audio output; powered by DC 5 V–12 V. Connections: 3.5 mm input interface compatible with 4-pin plugs; headphone output supports headsets with microphone and retains normal mobile phone call functions. Construction: High-strength aluminium alloy housing for corrosion resistance and stable operation. How this product solves common problems Fixes thin or boomy sound: Use the 7-band controls to reduce problem frequencies and restore natural balance. Avoids level mismatch: The 5× pre-amplifier brings low-output sources up to usable levels without introducing extra devices. Keeps headset functionality: Connect common smartphone headsets and retain microphone/call functions, avoiding incompatibility with mobile calls. Withstands home use: Aluminium construction prevents corrosion and mechanical wear that can degrade performance over time. Practical use scenarios Home music system: Integrate with a stereo or powered speakers to fine-tune music playback in small rooms — reduce bass boom, tighten mids, or brighten highs depending on room acoustics. Podcasting or livestreaming with a headset: Use the 3.5 mm 4-pin input and headphone output to equalize and boost a headset signal while maintaining microphone and call functionality for mobile monitoring or remote guests. TV and movie playback: Improve dialogue clarity and control low-frequency rumble when connecting a mobile source or media player to a home audio setup. What to expect in everyday use Easy tonal adjustment across seven bands for quick correction of tonal imbalances. Stable stereo performance driven by reliable TL074 and 4580 operational amplifiers. Straightforward connectivity with common 3.5 mm 4-pin plugs and headset compatibility for mobile calls. Consistent operation from a DC 5 V–12 V supply in a durable aluminium alloy case. Technical summary Equalizer: 7-band, ±12 dB range Operational amplifiers: TI or ST Original TL074; 4580 present Pre-amplification: 5× Input impedance: 20 kΩ Output impedance: 600 Ω Channels: Dual channel (stereo) Power supply: DC 5 V–12 V Input interface: 3.5 mm supporting 4-pin plug Output: Headphone-compatible with microphone support Enclosure: Aluminium alloy, corrosion resistant This home audio equalizer delivers precise tonal control, dependable amplification, and practical headset compatibility while housed in a durable aluminium case — suitable for music systems, podcasting, and improving TV or mobile audio playback.