The MB Quart 390 is an audio component speaker system designed to deliver high-quality sound performance with a focus on clarity and power. It is part of a range that caters to car audio enthusiasts looking for a robust audio experience. Key specifications may include a power handling capacity of around 300 watts RMS and a peak power of up to 600 watts. The speaker features a dual 6.5-inch woofers that provide deep bass response and a 1-inch silk dome tweeter for crisp high frequencies. It typically has a frequency response range that spans from approximately 40 Hz to 20 kHz, allowing it to reproduce a wide range of audio frequencies. The construction often includes durable materials designed to withstand the rigors of car environments while enhancing sound quality. The overall design includes a sleek aesthetic intended to fit well within various vehicle interiors. Some models may come with adjustable crossovers to allow customization of sound performance based on individual preferences.