The NOVA-4 is a two-way, bass reflex speaker system, which means it achieves excellent low-end response along with good efficiency. Bass reflex designs yield greater efficiency and lower harmonic distortion when compared to acoustic­ suspension systems. 2)1," wide d·ispersiOi'l tweeter gives higher sound pressure levels per watt, which means you can use lower powered receivers or have greater head-room with your existing high power amplifier. (More head-room means that you're less likely to run into clipping with your amplifier ... and clipping means distortion.)