Personally I stick with PWK when it comes to enclosure design
https://www.youtube.com/watch?v=itHRCOpc5zI
https://www.youtube.com/watch?v=qCDR_PKk8FY
This is his appraocah to acoutsics
https://www.youtube.com/watch?v=E8Q13HvUDjY
I self build for fun, and the results far outperform even the most high-end 5 star winners. I recommend all to get into self build, or in this case, to support those who want to bring the benefits of self build to others.
As I keep on pointing out to others, so called high-end companies often use low-end components from the like of Scanspeak, Peerless, Vifa. The only company that can be applauded is Sonus Faber who (used to) use components from audiotechnology.dk, and they cost! as for the likes of ATC, PMC, Wilson Audio Rockford, the use of the aforementioned components is laughable. If, for example such companies used the Scanspeaker revelator tweeters, then fine, but they often use the lowest end of the component companies offerings.