Been playing w/ them a bit... unhooked one of them in my box (shared chamber, so one was kind of a PR)... anyhow, burped @ 55 Hz -- about where the box tune is. No numbers... this is just in my shop test box.
67.7 volts
47.1 amps
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3188 watts @ 1.44 ohms (1/2 ohm nominal in parallel)
One SAZ-3000D used for power. That is about all I can get w/ my Pyramid power supply and Wal-Mart Deep Cycles -- sold my test bench Kinetik or I could get a bit more like I did on the testing posting on my forum (a bit over 3200 watts w/ the Kinetik).
Burped it about 5 times... then let it play on that wave over and over for about 12 seconds, no issues. I, of course, have heavily re-enforced these w/ epoxy.
Sounds terrible with the spider inverting, but did not break.
So... budget SPL it is... pretty useless daily w/ stock soft parts.