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Speaker cone feels "loose". Is it damaged?

Rubber cement no, epoxy yes.

You will be gluing them together at the shear line, and will need to create a material that will extend beyond that point, plastic is IMO best, a thin epoxy impregnating the next 1/4" out from the tear should work. Too far and you will make the spider too stiff, to little and you will bend at the fracture line and quickly re-fracture there.

Did you call Simply Speakers (or other) to ask if they have a generic spider for this or an appropriate epoxy? You might be able to buy a cone kit that includes the cone with all of these parts assembled to it also.

The JBL in my photo has been running this way since I repaired it a couple of months ago, has a pretty large extension since it is a studio subwoofer. I ordered a new cone kit but haven't had the time to put it in, ... might not need to for a while!
 
I have also used Springfield Speaker, but Simply Speakers will respond to your tech request fairly quickly (from my experience) and they're pretty spot-on with their advice.

If no spider is available, you have the option of trying to fix yours, if it fails again you needed a new speaker anyway.

I used some "super glue" gel to tack the spider back together in several places around the coil former, after that was secure and all is centered, I went in with the West Systems epoxy on a (popsicle type) stick, created a band of epoxied spider fabric about 1/4" larger than the ring where it was torn, and back to the coil former. The epoxy will flex a little being that thin and will create a bit of a stress-relief for the actual glue joint, moving the flexing away from the glue joint and creating a more gradual bending / flexing.

If that won't work, there's a guy on evilbay who parts out a lot of infinity speakers, even repairs them, you might try contacting him (dr. something, look for NS-1000M parts and Infinity, he bought my old Infinity SSW-212, search that, or Monsoon).
 
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