Beolab 6000 repair question

[Epic B and O]

Hello,
I have just changed my drivers in my Beolab 6000s.
While removing them I noticed the foam on the back casing of the speaker was perished. See photo.
So I replaced it with some speaker sound deadener.
My question is…Will this affect the sound?
To me it doesn’t sound as rich, if that makes sense.
Any help would be greatly appreciated
Thank you

[Author]

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