Fatparrot,
Just saw your comments.
6dB loss in SPL per doubling of distance is correct! We are not talking about a power measurement here; rather, a voltage measurement when we read off SPL on a meter. Hence, 20*log() rather than 10*log(). Another thing is that since it is a ratio (SPL at 1m vs. SPL at 2m) when we do a divide operation, the impedance cancels out.
Hope that this clarifies.
Just saw your comments.
6dB loss in SPL per doubling of distance is correct! We are not talking about a power measurement here; rather, a voltage measurement when we read off SPL on a meter. Hence, 20*log() rather than 10*log(). Another thing is that since it is a ratio (SPL at 1m vs. SPL at 2m) when we do a divide operation, the impedance cancels out.
Hope that this clarifies.