I recently connected up a amp to my Alpine coaxial 3-way speaker system or 6 by 9" and it sounded amazing for a day, the next day though the left speaker developed a horrible squeaking sound. I thought part of the high range bit must have blown up. so i took the speaker out and as i push gently down on the main speaker cone it makes a horrible squeaking sound? i tried it on the other speaker but it was soundless. How do i fix this problem? im thinking something has fallen into the speaker? od do i just wd40 it?
Well for a 6x9, you just replace the driver. Rebuilding and re-coning it would be cost prohibitive. Speakers blow typically for two reasons 1. you had the gain on teh amp cranked up too far, and caused the output of the amplifier to clip, which thermally damaged the voice coil. 2. your amplifier draws more current than the car's charging (electrical) system can supply, which again, caused the amplifier to clip and thermally damage the coil.
Oh, if you have a multimeter or VOM, you can test the DC resistance of the coil between the speaker terminals when its disconnected from the amp. it should read around 3.6 ohms. If its an open circuit, the coil is shot.
I'm assuming he thinks the wd-40 will fix the squeaking noise. Which in this case, it will not as the driver itself is damaged. Best to have the driver replaced. Not worth to fix as already stated.
I suggested on a other thread 3 days ago to put Wd-40 on membrane and surronding to rehydrate a old subwoofer which I use sometimes then I see it here.
the voice coil wire winding had separated and frayed, so the copper wire was scraping on the former and inside of the magnet structure. There's no easy fix for that, and it requires re-coning the driver, which in the case of a 6x9, would cost about twice as much as just replacing the unit with a new speaker all together.