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To answer the two questions, I did not use anything between the felt and finishing fabric. The felt softens the edges enough so that there is no risk of breaking the finishing fabric, at least in this case. The felt that I used is very soft but also very dense that it works as a filter. It does not reflect high frequencies easily. It absorbs the sound and also let's it thru to the wool layers. If you play music in the room and put one of your ears close to the trap, you can easily hear that "nothing" is reflecting back from the traps. Of course it depends on the felt type you use.
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