Their Polypropylene woofer delivers a strong performance with great low-end extension and clean and tight midrange. The woofer is coupled with a PEI Balanced dome tweeter which fills out their sonic signature with crisp, high-end frequencies. An added bonus of the Stage 2 series is JBL's frame design, which has been engineered to easily fit into most factory openings without the need to modify the vehicle, mounting location or the speaker itself. JBL Car Audio JBL Car Audio products are some of the finest and most innovative products available. With an undeniably rich heritage in audio, JBL have their products in major concert venues and stadiums around the globe and are a go-to choice for music professionals. JBL have perfected their car audio products, so you can enjoy the true clarity and energy of music in your vehicle.