both Pioneer CS-R580 have this problem. i am not sure on to find replacement

Have you tried pulling the speaker out and checking for a part number off the back?

If all else fales you may be able to pull off a part number and finding specs. This would allow you to find a replacement.

I meant is eBay my only option? I replace both mids from Pioneer but every seems out of stock and they may never have more

There are many speaker specialist that repair all makes and model... Google search is your friend!!

Luckily Atlantic Technology still carries most all parts from their first Home theater line. I use their 270thx line for over 10 years..

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vacuum cleaner pipe end and gently suck it out.