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What is the best "stuff" to fill a speaker cabinet with?

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The following discussion will focus on practical facts on speaker cabinet stuffing and on sealed systems. Theory is limited help in selecting speaker stuffing. Vented system do share a few of these same issues and will also be mentioned, but the goals and physics of stuffing a vented box are different than those of a sealed box. NHT speakers use polyester fill. Some use a Danish polyester that mimics the properties of fiberglas very closely. Excluding this special poly, there are two kinds of polyester available: pillow stuffing, and audio-spec polyester. Forget pillow fill. It's cheap and easy to get. If you use enough, it will damp the midrange, and that's a lot better than an empty box. But it has little effect on lower frequencies. Some fabric stores sell "Super Good Stuff" from Stearns Technical Textiles. This is a common, inexpensive material that is said to perform as well as audio-spec polyester. For lining the walls of a vented enclosure to reduce internal reflections, or ... more
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