The WHARFEDALE's IMPACT-X15L is a passive speaker that delivers high power capacity and clarity, producing 350W RMS (1400W peak) of power with a low-end frequency of 45Hz. A 1.75" titanium diaphragm compression driver offers a powerful yet neutral sounding high end for high frequency. Both the HF and LF drivers were designed specifically for this series of loudspeakers, and they were engineered and acoustically matched to a highly robust wooden cabinet.