The ESB HR 4K2X is a two-way component speaker system from the Harmony series, designed to bring balanced and clear audio to your vehicle. This kit features a 100 mm woofer with a pressed paper cone and rubber surround, paired with a 0.8-inch silk dome tweeter to handle the higher frequencies with a smooth, natural tone. Built for reliable performance, the system utilizes a 6.4 oz ferrite magnet in the woofer and a neodymium magnet in the tweeter, delivering a nominal power of 50W RMS and reaching peaks of 100W. A 12 dB crossover is included for each channel to ensure a precise split between the 80 Hz to 20 KHz frequency range. With a sensitivity of 88 dB and a 4 Ohm impedance, these speakers provide a consistent sound stage that suits drivers looking for a refined audio upgrade without requiring massive power increases.