The all new for 2023, Alpine R Series Speakers have been completely redesigned from the ground up. This Next-Generation R Series gives your car audio system the upgrade it needs with Hi-Res Audio. Hi-Res Certified Using "trickle-down" technology, inspired design, and performance cues from the Ultra-High-Resolution AlpineF#1Status systems, the Next-Generation R-Series Speakers are Hi-Res Audio Certified and able to reproduce up to 40kHz frequency response. This ultra-wide bandwidth brings music even closer to the original source while the classic R-Series design maintains the "loud and fun" performance quality that long-time fans have come to enjoy. Glass-Fiber Reinforced Cone The new lightweight and rigid glass fiber-reinforced cone material allows for extreme movement and low distortion which results in an incredibly accurate and clean sound during playback. Upgraded Mid-Bass The Next-Generation R Series speakers utilize a ferrite magnet, different from neodymium from previous generation, and a larger motor structure that contributes to more mid-bass during the playback.Despite the larger motor structure, the speaker still maintains the same depth for easy installation. HAMR Surround Continuing with the Next-Generation R-Series speaker line is Alpine-exculusive High Amplitude Multi-Roll (HAMR) surround technology that increased excursions while maintaining linearity for more accurate music reproduction. Alpine S Series Amplifier Add to your new Alpine R Series Speaker, the power of an Alpine S Series 4 Channel amplifier to maximize your systems performance and sound quality.