Fixing a dent in a whoffer cone

I once used the wine tool which lets you reseal your wine with a vacuum. It worked, but the "kiss" idea is the same principle. And y'all are correct in that it's just a dust cover and does not effect the sound.

Thanks to you all (I really like the "kiss" method, I'm a little lonely...just kidding!) My speakers are Tyler Acustic. Several have called this a "dust cover"; there are no covers to the speakers. It is the actual center dome of the woffer that is dented.
Thanks again for your help!!!!

That central dome is a dust cap. It keeps debris from entering the very small gap between the voice coil former and the center pole piece and the magnets. If you can stand the look of the dented piece (I know that is not easy to do), it is best to just leave it alone. Whatever means you do employ to pop it back into shape, take care not to exert force without also holding it firmly in place so that you don't tear it off. But, if you do tear it loose, you can probably glue it back without too much trouble, assuming you didn't tear up anything else in the process.

One trick that *may* work is this:

Depending on the nature of the dent, there is likely to be a crease, leading to a corner on one or more sides of it. When the dent is caused in the first place, it usually starts by pressure being placed by an object(eg, child's hand), and moving across it. This corner is the the last part of the dent that occurred. What you want to do is reverse the process.

To do so, you want to very gently apply pressure on the cap on the undented part - near to and toward this crease. Do this such that you're not making another dent, but rather you're deflecting the cap just enough that it forces the dent out from the back - a little at a time. If you do have a "corner crease", you want to work on either side of it, because it will be hard to overcome the tension directly in that corner.

As noted above, you don't want to apply too much force that it will mis-align the voice-coil structure. If you're lucky you can work it most, or all of the way out. I've done this on a dome tweeter, and on car fenders (which is where I learned it - working my way through college as a body repairman).

I hope this makes sense - it's easier to show than to describe. It won't work in all cases, but does in many.

I know this is an older thread but I looked it up for help with a pushed-in tweeter dust cap on a pair of speakers I just received and wanted to add another technique that I discovered worked well.

I tried the vacuum cleaner hose trick, which had worked for me before, but it didn't have any effect on this one. Then I tried the adhesive tape suggestion, using the blue painter's masking tape that's designed not to leave a residue, and that pulled out most of the dent but left a small dimple that didn't respond even to the french-kiss technique.

As a last resort, I used a hair dryer on the low setting to gently heat the dust cap and the remaining small dimple came right out.

I don't know if it would have worked on the larger dent but I'd be tempted to try it first in the future since there's no physical contact with the dust cap and it's pretty easy to make sure you're not applying too much heat.