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Russ Andrews Acousti-Wool is the natural alternative to synthetic foam commonly used in loudspeaker cabinets.
Supplied as a single sheet, Acousti-Wool can be cut up or can be folded and lightly packed into the speaker cabinet (remove the drivers carefully to get access to them if required). As a very rough guide, you'll need about 1-2 sheets per medium-sized bookshelf speaker and 3-4 sheets per medium-sized floorstanding speaker. The sheets can be easily cut to size if required with a large pair of scissors or a scalloped knife.
TIP: Cutting is best done outside to avoid stray wool fibres getting everywhere.
Russ Andrews Acousti-Wool is the natural alternative to synthetic foam commonly used in loudspeaker cabinets to provide acoustic damping. Synthetic foam is cheap, easy to handle but provides relatively poor acoustic damping - it doesn't attenuate some frequencies, meaning that they reflect back towards the drive unit. Foam has a distinctive sonic colouration which is undesirable.
Acousti-Wool is ideal to replace foam. It's completely natural, effective at absorbing a wide range of frequencies and, being supplied in sheets is easy to use, giving a clear and natural sound.