The Infinity Infinitesimal IV is a compact speaker system that represents a significant advancement in the Infinitesimal Series. Launched around 1990, it builds upon the legacy of earlier models by offering improved audio technology and performance. The system features a 10.8 cm cone-type woofer that incorporates an Injection Molded Graphite (IMG) cone made of graphite reinforced polypropylene, designed for enhanced low-range sound reproduction. The woofer is equipped with a robust voice coil measuring 2.5 cm in diameter and an advanced magnetic circuit that mitigates vibrations, thereby improving sound clarity and depth. For high-frequency sound, the Infinitesimal IV utilizes a newly developed EMIT-R tweeter which employs a 3 cm diameter flat diaphragm. This tweeter is engineered to deliver exceptional transient response, low distortion, and a broad frequency range, benefiting from Infiniti's proprietary EMIT Tweeter technology. The flat diaphragm is made from a lightweight KAPTON film and is driven directly by a powerful magnetic assembly composed of ferrite magnets, ensuring precision and fidelity in audio reproduction. To enhance sonic performance, the design employs stepped baffles for phase alignment and a dense crossover network using high-quality materials. The enclosure is made of ABS synthetic resin to minimize resonance, with rubber damping strategically applied for additional sound isolation. Additional features include wall-mounting capability and compatibility with a dedicated subwoofer, allowing playback of ultra-low frequencies down to 40 Hz. The compact dimensions (152 mm width, 238 mm height, and 175 mm depth) and light weight (2.4 kg) make it an attractive option for both sound quality and space-constrained environments.