HiSenior Mega5EST Bass+ Enhanced Edition is an upgraded version of the award-winning Mega5EST IEMs, featuring a 5dB sub-bass boost for a thunderous bass experience. It boasts a five-driver hybrid setup per side, including a 10mm custom dynamic driver, dual Knowles BA drivers, and dual SONION EST drivers, all managed via a four-way integrated crossover. Tuned to the Harman target response curve with an emphasis on sub-bass, it offers a rich bass presentation while retaining clarity across frequencies. The package includes a premium flagship cable and a new carry case, making it a perfect choice for bass enthusiasts seeking high-quality sound.