I'd be interested in a update on this. I've been thinking of removing the harp and action from a acoustic piano and placing a digital piano inside of it. Then use the soundboard as a speaker for the keyboard.
What do I need to use for my 7.1.4 surround setup at home? Could I connect directly to a lets say an Yamaha home cinema receiver? Where can I buy these and what is the cost per piece?
I would assume it's missing a bit of low frequency range, for most glass windows (unless you have very big windows). I also suspect the frequency response will not be continuous across the spectrum; there would probably be a few well defined peaks, one for each harmonic of the window's natural resonance frequency.
