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Is the silencing cotton of the speaker dense or fluffy?
Henan Guangyu Sound Insulation answers for you:

It is best to be fluffy. We must remember a concept: to sound insulation, it must be solid, and to sound absorption, it must have pores. The silencing cotton in the sound system absorbs noise and echo more, making the sound clearer and more effective, so it is better to be relatively fluffy.