Mythbusting: "Phase correct speakers" are not phase correct (in relation to the drivers) 

Yes...........and that's where ( most) commercial crossovers fail............even when the specifications in the glossy papers tend to convince you of the contrary....

YT ate this post (because of the link), but managed to recover it: By True Taylor: "You seem to be unfamiliar with the use of FIR filters for phase correction. There are actually multiple ways to compensate for the time delay, but the typical process involves creating a profiled all pass filter that accurately unwraps phase rotation (based on your exact loudspeaker measurements). The lower the frequency you are trying to compensate to, the longer your overall time delay must be, but at around 40ms total delay you can get quite accurate phase response (+-10 deg, though this level of accuracy is hardly necessary, and filter simplicity should be prioritized) down to around 30hz. I know it's doable, as we have an entire system that I've built based on this process. It can be achieved with a 230$ Minidsp 2x4HD unit and it's FIR functionality. If you want to look at a commercial setup that uses this strategy, take a look at the Meyersound BlueHorn system. They achieve around +-40deg down to 20hz. meyersound.com/wp-content/uploads/2017/09/bluehorn_freq_phase-full.jpg " --> Thank you Taylor for your post! Indeed, with DSP many things are possible, it is a wonderful tool and many do like it unreservedly, and I also recommend to have fun with it. I primarily listen to analog media, and any digital in the mix throws it out of whack to my ears. Sorry, those who follow my channel know that I have a purist approach, and sadly sometimes this shows as less than accurate title-creation. I should adjust the title of this video to there are no phase correct speakers without DSP... ; )

Any single driver is a phase correct source it’s limited in frequency response but correct completely in phase

Why does a sealed cabinet go out of phase?

great video bro , plz teach us more of this software , can we talk about famous designs like audio note , Harbeth etc in relation to this software , like would this software tell us how those cabnits are affecting the sound , if you want some dimensions you can let me know ill send them to you. please read the comment below about tubes Thankz