A Question About Time Alignment

Time Cohesion is making sure that the sound from the tweeter gets to your ears at the same time as the sound from the woofer. Lets say theres a piano sitting 10 feet in front of you and a cello sitting 6 feet in front. The sound of the cello hits your ears faster than the sound of the piano. Its the ratio of the speed that needs to be conserved by the speaker. This can only happen if the time cohesion is tuned perfectly. 

The master has spoken.

It seems to me, however, that live music isn’t time aligned. Suppose I’m playing the piano and you’re sitting across the room. When I stretch out my left hand to hit the low notes, those notes travel along the same long, slow wavelengths as the notes from Wilson’s woofers. Similarly, the treble notes I play with my right hand move quickly through the short wavelengths. The notes from the piano are naturally out of alignment.

 

Something must be wrong with my line of reasoning. Would someone please point out where I’ve gone wrong? Nicely?

The time it takes for the low notes to arrive at your ears is slower than the highs no t because they are inherently long but because the voice coil of the woofer is mounted behind the baffle whereas for the tweeter it is mounted almost about the same level as the baffle hence the tweeter is closer to yours ears than the woofer. 

With a real piano, various sounds come out of it from various distances. These relative distances must be preserved by the speaker hence the requirements for time cohesion. 

in colloquial speech fast or slow refers to time. For example fast food refers to food that is prepared quickly. There is no mention of distance in that.

Phase really is time, if drivers are out of phase with each other, frequencies are leaving the drivers at different times, thus effecting time alignment.  I hope this all makes sense and helps in some way.  Tim

No you are just confusing the issue even more. Phase and time are two different things. time cohesion implies phase cohesion but not vice versa. So not equivalent at all. Time coherence between two drivers is about aligning the start of the waves coming out of each driver. You can have phase aligned yet time non aligned. 

On speaker design what we align is the portion of each driver where the sound is emitted, which is normally, aligning the front of each voice coil.  This allows all drivers sound to reach the ear at the same time. .... drivers can be staggered or sloped.   

This is also nonsense. 90%  of speakers are not sloped or staggered and nobody is complaining. Time alignement has never been proven to be beneficial let alone audible it is only for marketing. 

I am very disappointed in you Tim. Was waiting for your custom tuned circuits and they never materialized.

~Master Kenjit, speaker tuner and master audiophile.

It doesn't sit well to have a Master Speaker tuner and Master Audiophile that is so uncapable of doing his own work to come to me with no humbleness and then post this publicly.... 

Tim it does not sit well with me that you tried to tune my speakers remotely without even knowing what cabinets I was using. Sorry but any competent speaker designer knows that this is a bad idea if not impossible. There were so many variables to play with yet you were so confident, arrogant even to suggest that you could tune my speakers to perfection first time round. You then insinuated that should they not be satisfactory, you would be very upset with me. This is completely unreasonable.

If you are so confident I dare you to submit your circuit to me and it will be built and then judged to see how good it really is.

I hereby challenge you Tim.

@jerryg123 

It is an audiophile that has achieved a higher level of knowledge and understanding than other audiophiles about how to obtain perfection. We know what to listen for and we do not settle for anything less than perfection.