Insignia NS-B2111 xmax?

I built a ported enclosure for my Insignia NS-B2111 and am using them as my rear channel speakers in a home theater setup.
I tried crossing them at 80hz but they break up during reference volume peaks.
I had to bump them all the way up to 110Hz!!

As such, I'm wanting to find another woofer to drop into my nicely built DIY enclosures, that will take more abuse.

I have a pair of Dayton RS180P-8's which is the largest size speaker I can fit, but unfortunately it looks like they want a much larger enclosure.

So I need to find a woofer, but I need to know the Xmax of the Insignia NS-B2111 so I don't buy another woofer that is just as "wimpy" as the B2111.
 

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