Papermaker85 5,000+ posts
Banned
phase not group delay is usually the biggest issue with vented alignments. its funny how most woofers actually phase response free air *****..that was something i was going to align with the thinking, that and i/b setups, but obviously we're on the same page... like theyve never heard a superiorly engineered hifi set of ported 3.5/4 way cabinets or dedicated sub where the science in gist is the same, but waaaaay more involved in calculating for a flat response subjective to the listening environment, which i dare to say is possibly attributed to lack of effort and patience as i/b and sealed alignments are pretty basic to attain a quickly desired result in most applications.
however, there's a guy with an ib setup on a f/b page ive been following that cut out and baffled his rear floor pan rendering his car a large enclosure, but the work took quite a bit calculation according to him, and i tend to believe it with this video demo
I remember long ago i can't recall who did some group delay testing and it was said that at 40 hz 20ms was very hard to hear and at 30hz 30 ms was very hard to hear but there is no mistaking the phase shift in FR..