The FR10-8 4" dual cone full-range speaker from Visaton provides uniform frequency response and a surprising amount of low-frequency output. The 0.67 Qts motor is designed to offer optimal bass response when used in infinite baffle and open back applications, such as automotive car door speakers, ceiling and wall mounted speakers, and is perfect for use in open baffle designs. The whizzer cone design offers seamless time alignment when compared to multi-way speakers and provides superior off-axis performance.