What will be the most telling is how well the system (drivers and crossover as a system) passes a square wave swept through the crossover region. If you can sweep a square wave through the crossover frequency and it falls apart you know you have a time domain issue with your crossover and/or driver offset. In addition, you will see two peaks (or a smear) in impulse testing instead of one. If this is the case then your system is not a true point source and will never have the kind of coherency that it could. It is amazing how audible this is once it has been corrected. The Danley speakers absolutely nail this to perfection and this contributes to their incredible realism.
I'm not talking about resonant peaks, but the output from each diaphragm arriving at different times, thus seeing two impulse peaks.
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