Question #1: In a two-way design crossed over at ~2.2 kHz, can all of the baffle step compensation take place below the crossover slope to avoid having to pad the tweeter? I've been trying to model things and understand them, and it seems to me that with a 3rd (or higher) order crossover, you could keep BSC from interacting with the crossover summation (and be able to pick a less sensitive tweeter). I'm very unsure of this conclusion, though. Question #2: I notice that the GR AV3 uses a 90 dB sensitive tweeter, and the overall AV3 sensitivity is 91 dB. It uses two 87.5 dB sensitive GR165's in parallel (for 93.5 dB total sensitivity). I assume that around 3 dB of woofer sensitivity is consumed for BSC, which explains the overall sensitivity rating nicely, especially if the answer to my question #1 is correct. But the crossover here is 1st order... so isn't the tweeter still rolling off in the area affected by BSC? In other words, the tweeter's LF output would be reduced by the BSC. The GR165 seems to have a rise in the same region, so reducing the tweeter's input into the crossover summation could theoretically flatten out the woofer's response, right? It seems like it might be a very elegant/neat solution. Are any of these observations correct, or am I way off? (I might end up building some AV3s rather than trying to design my own towers, but I want to understand the theory regardless of whether the kit has already done the hard work or not. It's interesting to me.) Question #3: With a 2-way (one tweeter, one woofer) design starting with an 87 dB sensitive woofer, your maximum system sensitivity is 87-X where X is the amount of BSC you're using, right? If so, then why is the SCH tower kit that uses an 86.7 dB woofer rated at 88 dB sensitivity overall? In fact, how can that be possible even if you DON'T subtract X db for BSC? Can crossover components increase driver efficiency somehow? Question #4: is the "acoustic center" of a horn-loaded tweeter like the Morel MDT-37 further back than that of a normal tweeter since the dome itself is recessed? I have many more questions, and I'll add them to this thread as I run out of luck in trying to find their answers on my own.