What does a uncentered speaker sound like if you refoam and don't get the cone centered.

I removed the foam surround and cleaned it ready for the new one. Should be here today. But I am thinking of using the tone 30MH to center the cone while gluing it to the rim. I was told by some use a 9 volt battery but that seems to be a possible damaging tactic if left on too long.

1st set of woofer/coils I replaced, a thin sheet of plastic went into the gap with the coil, centering it (like the paper plate mentioned, After surround glue is dry, simply remove it.

https://reconekits.com/

2nd time, supplier’s method: simply pumping the cone with your hand, speaker on it’s back, when the adhesive is still pliable. his adhesive drying time is designed for this.

https://www.simplyspeakers.com/simplyspeakers-youtube.html

the coil/cone naturally center themselves, if off center, you will feel/hear the coil ’rub’ on the side of the gap it moves in/out in when you pump it by hand.

1st time I paid a pro. got em home, one coil rubbed, he re-did them.

1st time I did them, they were still downward firing. done, reinstalled, great, then, randomly, what's that little noise??

eventually, inside, found one of the staples holding the insulation had gotten loose and occasionally would bounce on the back of the woofer. what an easy fix.