Andy - the circuits control the drivers for a net 6dB / octave slope all the way down, including the interaction with the top end of the port where another pole is added to the top end of the woofer xo. Various conjugate circuits are applied to counteract bare driver anomalies. Since the usable driver range extends more than 3 octaves beyond the crosspoint, drastic measures can be called for.
As I said, I doubt that Jim would have tried to cross that midrange with that woofer, requring so much attenuation. He would have developed a smaller midrange with a higher natural bass roll out, to better match the 8" woofer with less brute force required.
As I said, I doubt that Jim would have tried to cross that midrange with that woofer, requring so much attenuation. He would have developed a smaller midrange with a higher natural bass roll out, to better match the 8" woofer with less brute force required.