Hi Richard, I am thinking the room is more the problem than the piano. If the piano will not reach out then super heavy hammer may help but at a tremendous cost of touch weight. The room needs tuning, not the piano. Does the teacher wear a microphone? Then so should the piano. In a practice room it was overwhelming, in the classroom it is underwhelming. That should tell you something about the piano itself. Yes it may need hammers but will they solve the problem? I don't think so. Just my opinion mind you. Newton
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