[SteveCallas]

Maybe a PR design sub has the best of the ported and sealed design subs, any opinions?

Not really. It has the steepest rolloff of all 3, the distortion around tuning will be higher than ported, and what seems to be ignored is that a lage enclosure improves subwoofer performance. Using a PR to get some of the benefits of ported while getting away with a small enclosure is a compromise.

 

[SteveCallas]

Yes, the steeper rolloff and distortions are minimal - I'm speaking more from an idealistic standpoint. A PR is a good solution for many to get what they want in the space they want, but it doesn't have the best from each design.