 Re: Room treatment materials in Aus??
You should be able to find rigid fiberglass "duct board" from heating and ventilation suppliers. It is typically 2 foot x 4 foot x 1 and/or 2 inches thick. Here in the US, we find it in 2 densities. The higher density is better.
One variety is black and treated to prevent the glass fibers from going airborn in a high velocity air duct. Another variety is untreated. The untreated is best because the pores are not blocked and absorbs sound better.
Cover this board material with acoustically transparent fabric. Here, it's called "panel fabric" because it's used for covering office cubicle partitions or panels.
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