I was using my decibel meter to determine the decibel limits (both minimum and maximum) of some of my horns to see how loudly and softly they can be played, and I found some unexpected results, which raised some questions in my mind: Does volume equal projection? If not, can projection be measured? If so, and it isn't just just decibel level, how would it be measured? Why can some instruments of the same type be played louder and/or softer than others? And how is projection perceived by the listener (player and/or audience)? Is it subjective or objective? Is it a contrast with the decibel levels and timbre of other instruments in an ensemble, or something else? What is projection? How does it relate to volume? Or does it?