@Kehaulani said in Does a large bore horn take more air?:
So I'm a little confused.
Could we summarize, then, in layman's terms, that the amount of air required doesn't necessarily depend upon what the bore size is but, rather, upon the collective design of the horn which includes a myriad of factors?
In other words, do some horns take "more air", horn-by-horn, depending on how it's constructed rather than on bore size alone?
Exactly this - horn by horn, depending on how it is constructed, how we hear ourselves, the efficiency of the entire body/mind/mouthpiece/trumpet/playing environment system. Even the term "amount of air" is not correct as our bodies have no measure of this except running out before a phrase is finished. We can believe that the horn is a loose blow indoors, we take it out to an open lake and the same system is like blowing into a brick wall!