Quad Hi-Definition MicroDrivers: For extended high-end clarity and unparalleled low-end performance</br>Patented Earphone Design with Groundbreaking Low-Pass Filter: Provides previously unattainable deep low-end performance of a True Subwoofer without sacrificing clarity or detail</br>Customizable Frequency Response: Adjustable sound signatures available (including balanced， warm or bright) via changeable nozzle inserts and removable， metal nozzle</br></br>Product Description</br></br>Evolved from personal monitor technology road-tested by pro musicians and fine-tuned by Shure engineers， the SE846 features a patent-pending design that includes a groundbreaking low-pass filter. This technology enables the deep low-end performance of a true subwoofer without sacrificing clarity or detail of mids or highs. Comfortable Sound Isolating sleeves block up to 37 dB of ambient noise， whether onstage or on-the-go. Customizable frequency response， detachable cables， and a wide variety of accessories ensure an unequalled， perfectly tailored listening experience for the most discerning audio enthusiast.</br><br/>http://www.amazon.com/gp/product/B00DIUGW6A