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I'm trying to find some cheap material to make acoustic reflectors out of. From what I hear the most important thing is that the material be stiff, however from my research stiffness (measured in GPA or bulk modules or elastic modules) has a pretty broad range. so I was wondering if anyone knew:

At what gpa does a material have to have to qualify as a good acoustic reflector?

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I suggest that you do some research into absorption coefficients and look for materials with a low absorption coefficient. If you need further detail I suggest you look at the Master Handbook of Acoustics: http://www.amazon.co.uk/Master-Handbook-Acoustics-Alton-Everest/dp/0071603328

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