Looks strange to me. The max impedance at resonance is only 11 ohms! 
To be continued ... next year
I clearly overstuffed my box. There is a big loss in low frequency for both the woofer and midrange (bass starts going down at 600 Hz for the panel).
For the woofer, I left the stuffing but placed two empty tubes that allow the air pressure from the woofer to go outside. The max impedance is back to high values. I plan to do the same for the mid panel.
Bruno
