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  1. Imagining a second Maelstrom-X 21"....

    DIY Subwoofers - General Discussion
    OK, so I'm done with (though I've not "finished") my M-21 in a sealed box. Let's just say I'm imagining adding a second one to the room to fill it in more. What would be my options if I went with a second driver? Would adding a ported M-18" be a poor mix? Would I *have* to go with a...
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