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Is sound dampening required for a subwoofer?

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  • Is sound dampening required for a subwoofer?

    Say I just built a sub that will cover 20Hz to 60Hz (where it gets crossed over at 18db/oct), does the cabinet need any sound dampening inside or are those frequencies low enough where most standard sound absorbing material become ineffective and will do nothing more than occupy some air space?

    Just curious. The cabinet is vented btw.

    Thanks in advance

  • #2
    Re: Is sound dampening required for a subwoofer?

    Originally posted by contoursvt View Post
    Say I just built a sub that will cover 20Hz to 60Hz (where it gets crossed over at 18db/oct), does the cabinet need any sound dampening inside or are those frequencies low enough where most standard sound absorbing material become ineffective and will do nothing more than occupy some air space?

    Just curious. The cabinet is vented btw.

    Thanks in advance
    A well braced sub is more important than a well lined sub, but there are other opinions. If your cone generates upper harmonics that could leak out of a large dia. forward facing vent, or telegraph through a paper cone, you could throw a hunk of convoluted foam or glass behind the driver or vent. I've built vented subs w/out any lining that sounded fine.

    Chris

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    • #3
      Re: Is sound dampening required for a subwoofer?

      http://sound.westhost.com/articles/boxstuff.htm

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      • #4
        Re: Is sound dampening required for a subwoofer?

        Originally posted by Chris Roemer View Post
        If your cone generates upper harmonics that could leak out of a large dia. forward facing vent, or telegraph through a paper cone, you could throw a hunk of convoluted foam or glass behind the driver or vent.
        +1, and all cones generate harmonics, so lining should be used. It won't affect anything within the sub bandwidth, but it will help reduce unwanted above-bandwidth content.
        www.billfitzmaurice.com
        www.billfitzmaurice.info/forum

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        • #5
          Re: Is sound dampening required for a subwoofer?

          What about sealed?

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          • #6
            Re: Is sound dampening required for a subwoofer?

            A nice article, but irrelevant for the topic at hand.

            I was so much older then, I'm younger than that now.
            OS MTMs http://techtalk.parts-express.com/sh...d.php?t=220388
            Swope TM http://techtalk.parts-express.com/sh...d.php?t=221818
            Econowave and Audio Nirvana AN10 fullrange http://techtalk.parts-express.com/sh...d.php?t=216841
            Imperial Russian Stouts http://techtalk.parts-express.com/sh...=1#post1840444
            LECBOS. http://techtalk.parts-express.com/sh...ghlight=lecbos

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            • #7
              Re: Is sound dampening required for a subwoofer?

              Interesting article, but it pertains to satellites, not subs.
              Hopefully the OP won't have any 400-1000 Hz freqs off the back of the cone to worry about.

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              • #8
                Re: Is sound dampening required for a subwoofer?

                Originally posted by lunchmoney View Post
                What about sealed?
                Stuff it. Measure the box Q to see how much is needed. Add stuffing until you get Q below 0.8 or you can't fit more in.
                www.billfitzmaurice.com
                www.billfitzmaurice.info/forum

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                • #9
                  Re: Is sound dampening required for a subwoofer?

                  Thanks everyone. I decided to try it first without any dampening, then I will add some and see what the difference (if any) I'll notice

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                  • #10
                    Re: Is sound dampening required for a subwoofer?

                    Originally posted by billfitzmaurice View Post
                    Stuff it. Measure the box Q to see how much is needed. Add stuffing until you get Q below 0.8 or you can't fit more in.
                    Yeah that's what I figured, and that's what I did on my dayton ref HF 12 in a 1.8 cu ft sealed.

                    But I didn't measure, I just used the "1lb per cubic foot" method.

                    How would I measure Q?

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                    • #11
                      Re: Is sound dampening required for a subwoofer?

                      Originally posted by lunchmoney View Post
                      Yeah that's what I figured, and that's what I did on my dayton ref HF 12 in a 1.8 cu ft sealed.

                      But I didn't measure, I just used the "1lb per cubic foot" method.

                      How would I measure Q?
                      Why, with your trusty Woofer Tester.

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                      • #12
                        Re: Is sound dampening required for a subwoofer?

                        Originally posted by Chris Roemer View Post
                        Why, with your trusty Woofer Tester.
                        +1. If you stuff a box that's already got a Q of 0.7 or less you'll make things worse, not better.
                        www.billfitzmaurice.com
                        www.billfitzmaurice.info/forum

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                        • #13
                          Re: Is sound dampening required for a subwoofer?

                          Meh, that's beyond my ability/willingness to buy more equipment.

                          It sounds great, not going to mess with it.

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