[HKD126]

The response you see is the result of a 3 way system that has been set up to recreate that of a 4 way. You are right about the woofers. As a result the body of the system from 100-200hz is severely lacking. With such broad filters and limited EQ the only way to bring that up, brings a whole lot of unwanted tones with it. Tuning a full range system I generally go with a 15-18dB difference from 60hz-1khz. I went a little bit more on this though....

As far as the phase plot, I would look at it. My point was that with the L7 turned on, there were phase issues and as a result you were seeing massive dips at the 125hz, 550hz and the 1.5khz region.

This was just me playing around in the car for 30 minutes. I have more time today and will go back out to do more measurements, averages and different EQ. I'll report back with what I come up with.