ALPINE R-Series 20cm – Subwoofer (4Ω+4Ω)
These redesigned, fifth-generation Type-R subwoofers include several enhanced features to achieve even cleaner, deeper bass extension, faster, more accurate transients and even greater output capability than before.

Extreme bass fits in more places The Type-R Subs have been completely redesigned to offer more installation flexibility and application versatility to build the ideal sound system. At 115 mm of mounting depth for the 8” (20 cm) this new design offers even greater output capability.	Keep it Cool = Keep it Playing The Type-R Subs have been completely redesigned to offer more installation flexibility and application versatility to build the ideal sound system. At 115 mm of mounting depth for the 8” (20 cm) this new design offers even greater output capability.
More Excursion = More Output The new FEA-Optomized Motor Structure together with our revolutionary High-Amplitude Multi Roll (HAMR) Suspension Design gives the new Type-R Subwoofers the highest X-max and SPL output in the category.With a real-world, measured 12 mm of X-max, allow the new 8” (20cm) Type-R Subwoofers to deliver the best-in-class bass output, ultra-low distortion, and unparalleled sound quality.	Keep it Cool = Keep it Playing Alpine’s Patented Radial Vented VC Heatsink and Airflow Management System (US Patent #7,634,101) helps to minimize power compression and ensures reliable long playing time by actively eliminating output-robbing heat away from the Voice Coil. The new one-piece cast aluminum frame with integrated shorting sleeve uses the entire frame as a heatsink, to allow for sustained power output and handling, even in the most extreme of applications.
More Motor Force = More Control Starting with a new ten piece, segmented magnet structure, the new Type-R subwoofers deliver more accurate, louder and cleaner bass with even more control. This new magnet assembly is also an integral part of the next generation of Alpine’s Patented Radial Vented VC cooling system.
1. FEA Optimized HAMR Surround The High-Amplitude Multi Roll Surround Design allows for extreme excursions without sacrificing valuable cone area. FEA Optimized for linearity and made with injection-molded Santoprene ®, the HAMR surround is a key part of the suspension system that allows for extreme excursions with accurate, distortion-free control. 2. FEA Optimized Spider w/reinforced Layer Spider Integration Ensures reliable and consistent control of the tinsel-leads to eliminate any possible mechanical noises or interference typical of many high-excursion designs. 3. Redial Vented VC Heat Sink & Airflow Management System Actively manages voice coil temperatures by forcing air directly across the heatsink system. 4. FEA Optimized Machined CRC Motor Structure Creates a symmetrical magnetic field while optimizing flux density to greatly reduce distortion, while further improving power handling and output.