Alpine SBR-S8-4 8&quot; Ported Subwoofer Enclosure
I believe that is the 8 in at play. Can't help the surface area. But Produces a lot of volume for its minimal size. I think all cars should come stock with one of these or similar. The real low lows you can't really get like a 12 inch but the volume is there. Punchy sometimes. I am content with the purchase. If alpine made a 12\\" in a similar sized ported box then I'd be happy. Plus the new version is 50$ cheaper than its predecessor. Thinking about getting a second one, but will decide once this is broken