A large hornline can have more volume and it can be easier for people to be a little less mindful on where one breaths, but that is not always the case. To me tunning is the key. A smaller hornline will sound louder if in tune than a larger out of tune hornline. Scientifically, it makes since. It is really kind of cool. So, all the small horn lines that have been around and that others have stated already were louder because they can play together as a in tune hornline.
But playing in a 74 member in tune hornline is really cool!!!
Ryan