1. NEVER pour kerosene or any solvent on a speaker cone! The solvent will weaken the cone fibres and result in a driver that loses it's homogeneity and will not respond the same way after that, will not match a similar driver in the same or paired cabinet. Also some cone-voice coil joints could soften when exposed even to solvent fumes. Try a hair drier and be patient. You may have to cut off the dust cap, a cm from where it is glued to the cone, and then use heat and sharp tool to work the glue and remaineder of the dust cap free. I cannot repeat this enough: Do NOT pour kerosene or any solvent on the cone!
Interesting to watch but for a how-to video it could really use some narration. At the very least, a few more titles to explain details like: what resistance measures should we get when checking with the ohmmeter, what are the little orange squares of tape and what are they for, etc.
Pardon my ignorance on speaker basics - would like a tiny direction for my problem. I bought a 8inch 50 watt woofer (not sub woofer) about 15 years back, used it for few hours and it sounded good. I opened it today and connected it to my amplifier and it outputs too little volume. I gently pushed the cone and spider up, and the volume goes up and it vibrates well. How can I fix it? The spider feels hard... the soft rubber on the outer edge of the cone is soft/flexible...
If the kerosene destroys the original glue then why doesn’t it destroy the new glue. You didn’t clean the saturated kerosene off of the cone so will the new glue adhere for long. What is the purpose of the orange stickers, maybe you couldn’t see your original coil depth markings?
coil also attached from down side to spider how apply glue there, u didnt show in video.ita tricky and difficult part. remove or apply glue to sipder with cone.