high excursion drivers for sealed boxes

Check out JL Audio's new W7 series subs. They're for car audio, but they're very well designed (unlike most car audio stuff), and have huge Xmax. I havn't heard the W7 series yet, but even their lowly W0 series subs sound quite good.
 
Good call on the Date

I did not notice at first

I was thinking in my head
" Dont you know there is dual spider drivers with 60 to 70 mm Xmax these days "

I find it ridiculous ,
But hey, everyone is welcome to have fun with whatever they want to throw their wallet at

I found the 2nd post to be more sensible.
If you really need that much excursion , just use 2 drivers
 
Less than half that, on a good day.

"78mm peak to peak Xmech excursion (65mm Xmax)"
You are correct.
SVS states a 13.3mm Xmax for the SB-1000 Pro, which appears to align with CEA-2010-A peak output/distortion tests from multiple sources compiled by @sweetchaos in his Subwoofer Comparison.

A bit less than half the 65mm peak to peak excursion (65/2=32.5mm seems to correlate with the SVS SB16 Ultra's CEA-2010-A "pass" at 20 Hz, around 102/103dB at 2meters ground plane when adding +6dB to make up the difference between 2meters and one:
Excursion21&16&12.png

CEA-2010 is an industry standard first published in 2006 (updated as CEA-2010-A in 2012) that specifies a method for measuring maximum SPL before distortion reaches a "fail" level at various frequencies, requiring progressively less high order distortion to "pass".
https://docs.google.com/spreadsheet...fyBjaxK69dkXte6ZL6anVTW2_M/edit#gid=834598950
SVS CEA-2010-A.png

The SVS SB16's 20 Hz output appears to be around equal to Josh Riccis Data Bass CEA-2010-A measurements of the 21" (16.5mm Xvar) B&C21D115 in a sealed box.

Art
 

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