Introducing the 21NFR - a small driver with a mighty punch! This gem was developed to deliver a full range of frequencies, from rich bass to crystal-clear highs, making it the perfect choice for portable products, bookshelf speakers, and array applications in columns. What sets the 21NFR apart is its full-range behavior, eliminating the need for additional tweeters while still achieving excellent sound quality. Our extensive experience in designing highly efficient transducers shines through in this driver, offering top-notch performance without breaking the bank. The u-cup style magnetic system is optimized to deliver consistent magnetic flux to the voice coil across the entire operational range, ensuring a powerful and consistent audio experience. Plus, with a lightweight yet robust cone attached to our specially crafted rubber blend surround, the 21NFR is designed to handle low frequencies with ease while also excelling as a high-frequency device. Get ready to experience the power and versatility of the 21NFR - where small size meets massive performance.