Hello everyone,
This is the wood I am going to use for sides and back of the twin Orchestras, a beautiful set of Crelicam ebony from Madinter.
Here are the main parameters:
Radiation coefficient: 4.3
Young's modulus : 16.1 GPa
Density: 950 kg/m3
Q Factor: 120
Density is almost 3 times higher than spruce, therefore even with a very high stiffness, the radiation coefficient is very low. This comes handy, as it will reduce the mobility of the active back (as it is on the Orchestra model), and avoid absorbing too much energy from the soundboard monopole. This Ebony active back will be tuned around 214 Hz, and will add a touch of complexity to the tone of the guitar, on the midrange, leaving the soundboard monopole very dynamic, sensitive and projecting. 🙂
I have to say, I have the feeling I am talking to myself. Is there anybody out there interested in acoustic guitar design?
Cheers,
Giuliano