The Massive Audio SUMMO64XL is a powerful 6.5-inch Subwoofer that produces high SPL while allowing you to save as much space possible in your vehicle. High quality materials like its Kevlar fiber non pressed paper cone stitched to an EROM foam surround are utilized and bolted to a durable cast basket and 48oz double stacked high energy magnet. The SUMMO84XL weighs in with a 90oz magnet assembly and 2 inch 4-Layer High Temp Voice Coil.

Both SUMMO Subwoofers may be small in stature but will definitely impress even hard-core audio SPL enthusiasts. As with all SUMMOXL Series subwoofers, we deign them all to play so low and with such a deep center of force that the competition cannot help but to bow out gracefully.

Let there be no doubt that with Massive Audio you will be the “King of the Ring.”

FEATURES INCLUDE:

Die Cast Basket with Black Textured Finish
Kevlar Fiber Enhanced Non-Pressed Paper Cone with Textured Paint Finish
EROM Foam Surround with Red Stitching
1.5” & 2.0" 4-Layer Hi-Temp Voice Coil
Fiberglass Woven Dust Cap
Double Stacked 48oz & 90oz High Energy Magnets
Enhanced Cooling T-yoke Design with Black Anodized Finish
Customized Rubber Gasket and Magnet Boot
16 Gauge Pure Oxygen Silver Tined Power Cables with Direct Lead Connection
Triple Black Poly Cotton Spiders with Mirror Image Layout

Source: https://www.massiveaudio.com/blogs/massiveblog/massive-releases-new-summoxl-6-5-8-inch-subwoofers