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The problem with a type of system like this is getting everything phase matched properly. In a two way system you design for flat response, then tweak component values until your phase is coherent. In a 2 way you can play with all the values in the mid and tweeter xover to get your phase correct. Changing each component value will shift your phase one way or another. So if you do a 3rd order on mid and tweeter, you have 6 components you can play with to adjust the phase.
In a 3 way or system with even more drivers, this becomes difficult. Say you get your xover phase set well between the woofer and mid. Now you move on to the tweeter. The only thing you can adjust easily without messing up the woofer/mid phase are the tweeter values. If you adjust something in the mid xover, it is possible to throw off the phase for the mid/woofer xover. So you only have 3 components in the tweeter section to play with to adjust the phase instead of 6 like in a 2 way.
This is the challenge I see with more drivers in a system. If you have drivers with a very flat response, and go through and do impedance compensation before you start the xover design it does become easier though. If everything had a flat impedance and flat response to begin with, Xover design would be simple.
John
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