The Alpine SPR-50 Type R coaxial models feature a 1" swivel ring tweeter to improve off-axis response in less than ideal installation locations. Experience greater detail and impact of your music with the hybrid layered pulp with mica coating woofer cone. The High performance Linear Drive Motor structure has a large magnet that is almost as big as the voice coil diameter. Its dual radial magnet and twin gap combined with a square, edge wound voice coil gives the diaphragm linear movement over a much greater range. 270W Power Handling, 4 Ohm Speaker.