The ESB 4.75 is a high-performance midrange speaker from the Quattromila series, designed to deliver clear and precise vocal reproduction in a compact 3-inch form factor. It handles 100 W RMS and up to 200 W of power, operating with a nominal impedance of 4 Ohm and a sensitivity of 90.6 dB. This unit covers a frequency range from 140 Hz to 12,000 Hz, making it an effective choice for those building a detailed multi-way audio system. Its construction focuses on durability and acoustic accuracy, featuring a long-fiber, unbleached pulp cone with a specialized external treatment and a UV-resistant soft nitrile rubber surround. The internal architecture relies on a large aluminum copper-clad vented voice coil driven by a high-grade N-52 Neodymium magnet. To ensure stability and precision, the speaker uses CNC-machined and cold-forged ultra-low carbon alloy steel for the pole piece and plate, all housed within a sturdy die cast aluminum alloy basket. With a mounting diameter of 77 mm and a shallow depth of 37 mm, this speaker fits easily into tight interior spaces. Each unit comes with a deluxe stainless-steel protective grille and a mounting ring gasket, providing everything needed for a secure installation in custom car audio projects.