Replacing my rear speakers on an 08 Z. After removing the panel. I noticed a paper fabric behind the grill. Just trying to figure out if this was included with the stock speaker or something added afterwards. I have some other speakers installed a few years back. Not an audiophile, just want to know before I put this back together. Not sure if it is needed. Also not sure if this will affect sound at all. Anyone seen this before? Pics of the fabric, the grill with and without attached.

Thanks
Dave

 

It comes stock. You can remove it I'd you'd like. I did...

 

I'd junk it.