The ESB HB1.10S4 is a 10-inch car subwoofer from the Harmony series, designed to bring deep, controlled bass to quality car audio systems. This Italian-built speaker features a pressed paper cone and a large Y25 ferrite magnet, which together help it handle a nominal power of 200 W and peaks up to 400 W. To ensure stability under higher loads, it is constructed with an oversized cone and suspension. With a frequency response ranging from 43 Hz to 1.5 KHz and a sensitivity of 88 dB, this single voice coil unit with 4 Ohm impedance delivers a balanced low-end performance. For the best results, it is recommended to install it in a closed enclosure of approximately 28 liters, making it a reliable choice for those looking to add a focused and punchy bass foundation to their vehicle's soundstage.