JBL K130 question

[retro soulman]

Recently i purchase a pair of JBL k130 from the bay in good condition. Today the woofers came home and i check the dcr and their condition in personal. The cone number on both is 50571. The one looks like its reconed but just from some glue on the spider. Dcr is close (6,2 and 6,9 if i remember well). What i realise is that the cone is very fragile and flexible and when you press it gently inside and out sometimes you hear the coil scratching. I test both drivers with low freq and they dont make any coil noises and they work and sound good. Is that coil noise normal when you press the cone by hand? Best regards !

[Mr. Widget]

If you very carefully press on the cone with even pressure it shouldn’t make a noise, but since the gap is narrow if you press it slightly unevenly it will scrape. It is very common for these drivers to have been overdriven causing them to overheat which will warp the coil.

If you sweep test them with low to lower mid frequencies and there is no audible scraping you should be fine.


Widget

[retro soulman]

Now i feel a little better :dancin: ! What about the cone number?