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Message: <blockquote data-quote="FoxPro5" data-source="post: 4745664" data-attributes="member: 562649">How high does the sub play? We'll just say it plays to 100 hz. To eliminate a back wave, you'd need to block it with something very heavy and dense (like lead) or you'd need to absorb it. To absorb a 100hz wave at a 0* incident angle (straight on) you'd need an absorptive material (ex open cell foam) that's about 34" thick (nearly 3 FEET).  A 100hz wave is over 11 feet long.Really anything thinner in absorptive material and the wave will just refract right around it. How is it that you can hear heavy bass notes from the Hummer 6 cars away??</blockquote>

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