The cracking sound you’re hearing is the voice coil banging into the magnet and pole piece. The voice coil gap is very tight. Two things hold the coil in alignment- the spider, and the surround. The spider is the big accordion looking thing behind the cone. The surround is what you messed up. When you glued the cone off center you also caused the coil to be out of alignment. It is okay and has enough clearance, until it starts moving a lot with powerful bass. Then it scrapes and makes that sound.
If you haven’t abused it too much already you might be able to cut the surround and re-glue it properly and save the driver.
Do not cut the dust cover. Behind that is the spider, the one thing that is still in the right place. Lose that and you are screwed. Whoever said to cut the cap is telling you how to destroy it for sure.
If you haven’t abused it too much already you might be able to cut the surround and re-glue it properly and save the driver.
Do not cut the dust cover. Behind that is the spider, the one thing that is still in the right place. Lose that and you are screwed. Whoever said to cut the cap is telling you how to destroy it for sure.