HD15 Response Plots for different drivers

I measured my system and the response was much flatter than expected, particularly in the bass, where the HD15 (only) was being used for a nice lightweight system with throw.  I expected there to be a peak, as on the HD15 plans, but it was not present.

I've just thought why there might be a difference, the original plots were made for some American specification driver, but I then used an alternative one from P Audio.

Rog, can you give us some predictions on how different drivers should perform in this cabinet?  I can't remember all the new recommendations, but plots of the Eminence, C15 500LF, and the Neo would be a good start.

If I can make it to the bass shootout and if I can liberate my system then if anyone has the drivers they can be loaded into some of my HD15's as we used t-nuts and clamps to secure the driver, so they can be loaded with any driver...  We've got PD154's in ours, it would certainly be interesting to see the comparison to a P. Audio

if i can make it, i've got four, with bm-15lf's for yet another comparison. probably even less peakey than the challengers, they go nice and low..........

Can anyone predict, i.e. not measure empirically, what response drivers suitable for the HD15 produce?  Even a rough estimation would be better than none.

Hopefully we will get some empirical results next weekend.

in single/pairs hows power handling and punch  of HD15 vs same size angled/vented scoop (like ARLS)? (imagine 40-45Hz highpass is needed on vented type)