The ESB 4.28 is a high-frequency tweeter from the 4000 Series, designed to bring clarity and detail to your vehicle's audio system. It features a Sonatex polymer-laminated silk dome that works alongside a ventilated aluminum CCAW voice coil to deliver a frequency response ranging from 1500 to 22000 Hz. With a nominal power of 100 W and a peak of 200 W, these speakers maintain a high sensitivity of 93.5 dB, ensuring efficient sound reproduction even with modest amplification. Built for durability and precision, the tweeter is housed in a fiberglass-filled ABS body with a CNC aluminum flange for a secure fit. A high-grade N52 neodymium magnet provides the necessary magnetic flux in a compact form, allowing for a shallow mounting depth of only 11.5 mm. To protect the internal components without sacrificing sound quality, it includes an acoustic stainless steel grille and an internal felt damper that helps reduce distortion and widen sound dispersion. This combination of materials makes it a practical choice for installers looking to integrate high-performance audio into tight spaces where a 47 mm mounting diameter is available.