When I calculated box volume, I assumed that three pairs of cross braces would be used and that the wood stock would be 1 x 2. I don't recall the exact displacement, but it seems like it was something like 300 cubic inches. So I don't know how much room the braces in Rodney's speakers are, but I expect they aren't much more than a hundred or maybe two hundred cubic inches more. That's not a lot, and there's no way you could see the difference in tuning from this on a response graph.About the tweeters, to be honest, I really like the sound of the KSN-1038's. I wouldn't want to try to use them in systems that needed to generate concert level sound, but for maximum output of 110dB-115dB, I really think they're great, particularly for the money.