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  • Earthquake 21 – Building two 21″ Subwoofers

    Posted by Toids_DIY_Audio on December 3, 2022 at 7:05 am

    I had a theory that in the right room, a 21″ sealed subwoofer could actually out perform a smaller subwoofer that was ported significantly lower. THis was due to room gain that the sealed would get, as well as the belief that most people have more headroom in their subwoofer than they will actually ever use. So in theory you could get a bigger subwoofer, in a smaller box while getting better output. So I went ahead and ran some simulations to see what I thought I could get. Here is the video that goes over the theory and what I believed would happen.

    After the theory was over with, I decided to put my theory to the test by getting two SB Audience Rosso subwoofer. This was by far, the subwoofer that I felt would give me the best results for this test. I ended up building two 21″ subwoofers both in their own 6 cubic foot (internal) box. They were only 2′ x 2′ x 2′ externally. Which made it a smaller and easier to place enclosure than my MX15 – 15″ subwoofer.

    Earthquake 21 next to the MX15

    Quite a feat. And in the end, I got better extension without the need of a high pass. So all in all, this appears to have worked great in my room.  And I think this will work well for others that also want to try this. E specially for those that want to chase those ultra low frequencies.

    Here is the build video along with the results.


    Toids_DIY_Audio replied 10 months ago 1 Member · 0 Replies
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