I decided to go with a sealed box for my Pioneer TS-W304R sub, as I listen to a wide variety of music and wanted ensure SQ and accuracy. The box came to me in fine shape, I think it had one little ding in a corner of the carpet, but nothing you'd care about or notice, really. It's solid- 3/4" MDF instead of the thinner stuff some companies try to push on you. While it appeared well sealed, I caulked all interior seams, just in case. I also added some dense poly batting- not polyfill, but the stuff that comes in sheets- to the interior walls to reduce potential unwanted resonances. Lastly, I added the "hook" side of some strong velcro to the floor of my trunk, which sticks well to the carpet the box is covered in. Between the weight of the box, the speaker, and the velcro, it hasn't moved an inch in 6 months of driving. Anyhow, the setup is louder than I expected from a sealed box (because everybody else seems to go with ported), and accurate enough for all kinds of music. No unwanted sounds from the box, and it is holding up well under a lot of loud play. There is only one feature I'd change: it has binding posts on the outside that lead to spade connectors on the inside. Why not have binding posts on the inside, too? Seems like a bright idea, though I don't recall ever having seen it on any other box.
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