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  • Dual Opposed Sub's

    I for awhile have been looking at the dual opposed sub boxes on DIYSoundGroup's website and have been giving it some thought. I was thinking about making a table from one of those boxes but the only one that has ever showed available is the 8 CF box which would be massive overkill for me.

    Has anyone here ever built one of those dual opposed boxes? I am just curious as to the results you may have gotten and it it was something that dug deep and hit hard?

    Any feedback would be greatly appreciated...

    Kevin
    Shaken, not stirred...

    Classix II
    OS MTM's
    Digger 8 sub
    Overnight Sensations Center Channel
    Sprite Build
    Wolf's PC Speakers
    Minions III with Voxel Sub

  • #2
    Re: Dual Opposed Sub's

    My IB is a quad of opposed mounted Tempest-X 15's. It succeeds in isolating mechanical vibration transfer to the walls, leaving just sound pressure. And holy cow can it pressurize the room. I only have 1600cu/ft in the HT space total (3000cu/ft behind the sub.)
    diVine Audio

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    • #3
      Re: Dual Opposed Sub's

      I have dual opposed subs. I really really love the DO idea. It actually works. At first I had 2 single down firing and a dual opposed (4 drivers, 3 cabs). The DO cab was so much better I bought two more subs to make the other cabs DO, giving my 6 drivers, 3 cabs, all DO. And man what a difference. Totally inert. Clean and clear bass. I have them firing up/down like bossobass.com described. Get them near the wall and all the drivers are within an 1/8 wavelength of the wall. My listening position measurement looks nearly anechoic with a room gain taper from 30hz and down. It's insane. Anything else would be a step backwards as far as I can tell.
      https://www.youtube.com/channel/UCm2...oSKdB448TTVEnQ

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      • #4
        Re: Dual Opposed Sub's

        Originally posted by cjd View Post
        My IB is a quad of opposed mounted Tempest-X 15's. It succeeds in isolating mechanical vibration transfer to the walls, leaving just sound pressure. And holy cow can it pressurize the room. I only have 1600cu/ft in the HT space total (3000cu/ft behind the sub.)
        OMG this is awesome! How often do you do screenings for fellow Chicago people :P
        My Build Thread's
        Carrera's / Finalist TL's / Speedster TMM's / Speedster MTM Center / Overnight Sensation Surrounds

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        • #5
          Re: Dual Opposed Sub's

          CJD,
          Could you draw this out please? I'm having a hard time picturing a dual opposed IB in my mind.

          thanks
          David

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          • #6
            Re: Dual Opposed Sub's

            Originally posted by blue934 View Post
            CJD,
            Could you draw this out please? I'm having a hard time picturing a dual opposed IB in my mind.

            thanks
            David
            Place a box with an open top into a cutout in the wall, open side first. Mount drivers to the four sides and not on the 'bottom'. They fire at each other paired, and there is no oscillation to make the wall move.

            See it now?
            Wolf
            "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
            "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
            "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
            "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

            *InDIYana event website*

            Photobucket pages:
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            My blog/writeups/thoughts here at PE:
            http://techtalk.parts-express.com/blog.php?u=4102

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            • #7
              Re: Dual Opposed Sub's

              Originally posted by Mike220 View Post
              OMG this is awesome! How often do you do screenings for fellow Chicago people :P
              +1

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              • #8
                Re: Dual Opposed Sub's

                I was thinking of building a table with a 2.5 CU DO box and make into a coffee table. So you would have LFE literally at your feet while watching a movie. So I think I will start planning something out for this. I just need to find the right table top for the project.

                Kevin
                Shaken, not stirred...

                Classix II
                OS MTM's
                Digger 8 sub
                Overnight Sensations Center Channel
                Sprite Build
                Wolf's PC Speakers
                Minions III with Voxel Sub

                Comment


                • #9
                  Re: Dual Opposed Sub's

                  Originally posted by kevin007 View Post
                  I was thinking of building a table with a 2.5 CU DO box and make into a coffee table. So you would have LFE literally at your feet while watching a movie. So I think I will start planning something out for this. I just need to find the right table top for the project.

                  Kevin
                  That would certainly make your soda "pop" and give your coffee the "jitters" and decapitate the "head" of your beer... might even give "flight" to your buffalo wings.
                  "We are just statistics, born to consume resources."
                  ~Horace~, 65-8 BC

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                  • #10
                    Re: Dual Opposed Sub's

                    Thanks Wolf, thats what I had in mind he might be doing but for some reason I was locked into the boxed version with woofers opposed and magnets facing each other which wouldn't allow IB.

                    David

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                    • #11
                      Re: Dual Opposed Sub's

                      Originally posted by marvin View Post
                      +1
                      +2!

                      Never thought about this, sounds very interesting. Obviously there isn't any issues with cancelling out waves, right?

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                      • #12
                        Re: Dual Opposed Sub's

                        Unless the bottom of the box is open to the basement....

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                        • #13
                          Re: Dual Opposed Sub's

                          Originally posted by Tin_Ears View Post
                          That would certainly make your soda "pop" and give your coffee the "jitters" and decapitate the "head" of your beer... might even give "flight" to your buffalo wings.
                          Since it is a dual opposed box it shouldn't vibrate...

                          Kevin
                          Shaken, not stirred...

                          Classix II
                          OS MTM's
                          Digger 8 sub
                          Overnight Sensations Center Channel
                          Sprite Build
                          Wolf's PC Speakers
                          Minions III with Voxel Sub

                          Comment


                          • #14
                            Re: Dual Opposed Sub's

                            I'd be happy to set up a screening for folks. I've hosted a couple small gatherings in the past... I have a few speakers around too.

                            You can see half the IB manifold below the screen here.
                            diVine Audio

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                            • #15
                              Re: Dual Opposed Sub's

                              CJD's whole home theater is quite impressive. Everything is way oversized for the room. His IB is probably the most potent subwoofer/room combos I've heard. And, I've heard quite a few. The screen size and curved will make you feel like you're in the front row at the theater.

                              But, I hear he has 4 18" Maelstroms looking for a home somewhere.

                              Keep me in the loop if you ever decide to do a Chicago GTG.
                              - Ryan

                              CJD Ochocinco ND140/BC25SC06 MTM & TM
                              CJD Khanspires - A Dayton RS28/RS150/RS225 WMTMW
                              CJD Khancenter - A Dayton RS28/RS150/RS180 WTMW Center
                              CJD In-Khan-Neatos - A Dayton RS180/RS150/RS28 In/On Wall MTW

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