I'll be that SPL is excellent. I wish it were:
1. Less expensive.
2. Had a wider choice of freq range to cross with 50-120 fairly narrow, could use a x10 feature
Apogee utilized a "Dedicated Active Crossover" dubbed the DAX for its Diva speaker (large, planar magnetic speaker, sort of like Magneplanars). I don't know about the specific contribution of the DAX and biamping, but, the system sounded quite good.
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