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How the heck do you tune passive radiators!?!?!

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This is annoying me. One search tells me to do it a certain way and by my math, I come up wit 5lbs of weight. A calculator I found is telling 25 flippin pounds!! WTF?

I used to have a Boston SPG555 with the matching PR. And in 1cf, the 30hz tune weight was tiny. I don't get it.

I mean, I am trying to tune a relatively small box; 1cf for a single 12 with (2) 12" PR's but this isn't adding up. I mean, my HT sub uses a PR and I know that thing isn't 10lbs.

Can anybody shed some light here?

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