Subwoofer Glue/Compound?

[bineon 10+ year member]

I own 2 Crossfire dB312D subwoofers and today, while attempting (and eventually succeeding) to construct a ski pass into my car, the tool I was using slipped and the wooden handle struck (and cracked) the center of my subwoofer. There is no visible damage to the subwoofer other than the plastic (dust-shield?) being cracked a few inches. This happened to a friend a while ago and I remember he used some sort of glue to seal the plastic back. Though it was a bit of a rig, it worked rather well. The reason I need to do this, of course, is because the air seal is now less effective and I'm somewhat concerned to use the sub while there is a less-than-adequate seal.

Please suggest some sort of glue that I can use to seal this, thanks!

PS: I'm a n00b to subwoofers for the most part, please tell me what the front of the subwoofer, where the logo is located, is called. Thanks!

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[BJ The Man 10+ year member]

I dont know how to fix it.

but

The part you are talking about is the dust cap.