Estimated time drivers save by using real-time GPS traffic updates
Drivers that use GPS systems with real-time traffic info spend 18% less time behind the wheel than those who do not.
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Those are 2, 15" woofers, which means the two woofers are 30" tall. How can the WHOLE thing be 48" tall? Looks more like 5-6' tall.
I'd rather spend just $1,000 and go down to 15Hz using these:
http://av123.com/index.php?page=shop.product_details&flypage=shop.flypage&product_id=189&category_id=9&manufacturer_id=0&option=com_virtuemart&Itemid=37
If you hit the link to the Wilson Audio site, they give dimensions. 59" tall.
tl - those ports probably are close to 6" diameter, and to make just one make audible air flow you would be so over powered by the woofer output you would never know.
Needless to say, 21k for two custom 15" drivers and an automotive finished high end cabinet... sounds exactly like Wilson Audio.