Wayne Parham Messages: 18711 Registered: January 2001
Illuminati (33rd Degree)
It looks like a two-way speaker with direct radiating (open baffle) midwoofer, a helper woofer and CD horn tweeter.
If so, the crossover is very similar to what you would do for a box design. The dipole sets the pattern down low and through the lower mids but up higher - where you will want to crossover to match directivity with the horn - the pattern has collapsed beyond that set by the baffle (whether dipole or monopole). The only difference between monopole and dipole at this crossover frequency range is the dipole will have rear-facing output whereas the monopole will not. But the forward facing beamwidth will be the same as a monopole. So you can design the crossover similarly, I would think.
Seems to me the biggest difference will be what happens below the crossover frequency, EQ for the bottom end, etc. Since it appears to have two woofers, I'd low-pass the bottom one so it rolls off around ~200Hz. This will leave the upper one as the midwoofer, and it can be treated similarly to other DI-matched two-way designs. Some would call this a 2.5-way system.
Here's a thread with my design approach. It has a schematic that I hope might help, maybe use it as a starting point.
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