@dennis those panels are made by a guy here in Melbourne. He came round with a computer and mic and measured the reverb times and EQ profile of the room and then mixed and matched his panels to fix it. To my ears, it's worked a treat. That panel you see next to the mirror in the background is his design. There are quite a few more of those behind where the camera is in this video, including big ones as bass traps. They are a ply wood resonator/diffuser flexed over a foam absorbtion panel - they work great down into the low end. http://soundacoustics.com.au/product/architectural-panels/ha600-75-hybrid-absorberdiffuser/
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May I say please?
www.denischang.com
www.dc-musicschool.com
www.denischang.com
www.dc-musicschool.com