Hi-Res Audio Certified Sound: Experience superior clarity and detail with a frequency response up to 40kHz, inspired by Alpine’s top-tier F#1Status system. Enhanced Mid-Bass & Efficiency: The foam ring kit improves mid-bass response, reduces destructive wave interference, and enhances audio output efficiency. Durable & Lightweight Design: Polypropylene, glass fiber, and mica cone materials ensure high output and low distortion for reliable performance. HAMR Surround Technology: Exclusive High Amplitude Multi-Roll surround technology delivers powerful bass and precise cone movement. Easy Installation & Compatibility: The 3-piece foam ring system includes a peel-and-stick application for 6” and 6.5” speakers and absorbs unwanted reflections for optimized sound quality. Upgrade your car audio system with this premium bundle, featuring the Alpine S2-S65 6.5” Coaxial Speakers and a 3-piece foam ring speaker enhancement system. The S2-S65 speakers are Hi-Res Audio Certified, delivering crystal-clear sound with a frequency response of up to 40kHz. Crafted with advanced materials and Alpine’s exclusive HAMR Surround technology, these speakers provide powerful bass and precise audio quality. Paired with the foam ring speaker kit, this bundle minimizes sound interference, enhances mid-bass response, and improves overall efficiency for an unparalleled in-car listening experience. Perfect for audiophiles and casual listeners alike. This bundle is the ultimate solution for audiophiles seeking top-tier performance, reliability, and seamless installation for their car audio upgrades.