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More to this than I thought.

I measured all the crossover values, and the driver impedances at crossover frequencies.

Simulated using Passive Crossover Designer 7, It turns out the crossover is designed with a high Q to compensate for the peak the port creates, by creating its own peak at 300 - 400 Hz, rather than being designed for flat response. The two peaks together sum to a fairly flat response during the woofer pass band.

My info isn't good enough to do a full simulation, but I get the impression that the crossover is compensating for the peak the port creates, which would make the overall frequency response much flatter than simulating the box alone would let on.

In other words, I think I will stay with using a port for my rebuild - at least for now. And my apologies to the Sansui engineers who I thought badly of when I critisized the box design! I think they just sacrified a little flatness for sensitivity, rather than making a one note bass design.



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