SEAS 27TBFC curiosity

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While attempting to clean what I thought was speck of dust from the grill of one of my 27TBFCs, it appears that there is a clear plastic disk covering the centre of the grid (on the inside)...???

I know my eyesight is on the way out, but I don't think it's that bad, can anyone confirm that theirs are the same?

I suppose this will make a difference to the dispersion if anyone removes the grid... (I'm still very happy with these drivers, not complaining).
 
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