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Some good compilations of subwoofer measurements

Here is one compendium:
http://www.data-bass.com/systems

And another:
http://www.hometheatershack.com/forums/subwoofer-tests-archived/

Unfortunately, a lot of the more recent tests start at 105 dB and go up to 115 or even 120 dB. So the distortion they're measuring is almost entirely dynamic compression. I don't think that's very useful since most people will never play them that loud.

I look more at the 90 dB and 95 dB results (where I can find them) since that's about the loudest I play them. At 95 dB, there are a lot of subs that can hit 20 Hz at 10% THD or less, even some sealed 12 inchers. Some of the biggest subs are at 2-3% THD at 20 Hz and 95 dB.

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