Mute circuit prevents audible pops or noise during startup and shutdown, ensuring a clean listening experience. Insulated power supply provides electrical isolation, enabling safe use in vehicles without ground interference. Left and right channel equalisation is adjustable, with a volume control and three-band tone compensation for high, mid, and low frequencies, allowing precise sound shaping. Signal processing circuit uses the TINE5532 operational amplifier, delivering high fidelity with low noise. Key benefits - Reduces startup/shutdown pops and steady noise for clearer sound. - Suitable for vehicle use due to isolated power supply, minimizing ground-related interference. - Flexible tone shaping with independent left/right EQ, volume control, and three-band adjustments. - Low-noise, high-fidelity signal processing for cleaner audio output. Applications - Car audio installations to maintain clean signal and avoid ground interference while driving. - Home stereo or AV setups requiring customizable tone shaping and quiet operation. - Standalone or portable audio equipment where electrical isolation and low-noise performance are important.