AudioSilk
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AudioSilk Panels for Piano Control
I put two panels behind my Yamaha U3 upright piano which is very resonant and located in a bright room. They really helped attenuate the harsher frequencies. My piano teacher was so impressed he recommended the same idea to another of his students who had great success turning his almost unbearable piano into something very playable. I ordered two more for the purpose for which they were intended in my home studio room and they work very well and look good. Fairly easy to affix and super fast delivery so I highly recommend them. As an owner of a small recording studio I would counsel that they are not going to be as effective as custom designed and bespoke acoustic treatments but that is not their purpose. For a fraction of the cost they do a great job where you need some audio control.