I knew it was complicated from the gitgo, that's why I'm here. I don't want you to build them for me, but I am appreciative of shared collective wisdom to get me there quicker and without lots of wasted experimentation (spelled $$$).

I would like to stick with the N500s since I already have them, but if a significant performance improvement can be had with others I'm open.

AB, the woofers are straight 515s, but will go to GPA for remag and any other useful mods that won't break the bank.

Old Guy, what is meant by parallel resistance?

I won't need the 515s to go too low as I will keep my Velodyne DD-15.

I'm leaning towards building 817 cabs. But drawing a blank on HF horns. Will mating the 288s to 511 or 811 horns with the adapters ruin their response or help with the apparent need for some attenuation anyway?

Thanks again, all.
Jeff