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the shop guy in my city has some raw glasswool stuff... but doesnt seem very dense.. he also had some rockwool (thinking of using that) .. but he doesnt have anything inthe very dense category.. so i'll have to take maybe 3 2inch rockwool boards and stack them together... this way i'd have 5-6inch thickness.. would 5- 6 inches thick be good enough for all frequencies??
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