Everyone agrees that there is a certain line that when crossed, enters the realm of blastissimo. Trombones do it all the time, a lot of the time accidentally. With good air support, and knowing how fast or slow, and especially knowing where that line is for your own person is important. Pretty much this whole debate over cavies or PR boils down to two things...and this might be a little obvious but hey! oh well :) ...the staff and the players of each corps. Even good players might not reach the best they can play, or practice bad techniques such as over-blowing, with poor teachers. But the best teachers cannot teach players who will not learn, cannot learn, or are not at a level of playing as others.
I personally like the low end balance of PR, but i also appreciate the musicianship of the cavies. I am not saying that any of you arnt, its just as someone (sorry dont remember who and im too lazy to check :P ) said, they are apples and oranges. They both play very well, and i enjoy them both. Especially cavies 2002. They played that show great. In the slower moments, you can hear the lower parts, and the chords are quite open. But everything has to do with how the staff of each corps wants the sound to be. Staffs will strive for what they want and, hopefully, the players will play how they want. And everyone has their own opinions and are entitled to them, so a lot of this is subjective.