Yes, Erin has but there were vituixcad tranferable if I understood correctly, It would be great to just see the polar plot of the Dayton tweeter for the Overnight Sensation. Unless there is a way to load it in vituixcad and see a polar plot?
I'm fully with you regarding directivity being impacted by baffle layout I usually enjoy DIY with horns and you can often get polar plots for horns and there accompanying CD or some type of simulation with Akabak and the baffle layout is not important with these designs but with general tweeters it does need to be in the baffle.
So essentially, if the company or someone DIY enthusiast has not provided us with a polar plot for the CD + horn and a off axis response for th ewoofer or an example of a tweeter in a baffle such as Erin with the OV there is not much we can do unless someone goes through the difficult motions of measuring then tranfering to a polar plot and posting on a forum.
I actually let Audiolense do all the work for crossovers, I just try and get all the other variables right and matching directivity is not hard you just need the necessary information which is the difficult part to come by.
Yes, there is a zip file for each speaker with the individual data that you can load into VituixCAD. It was discussed on ASR, and some people including myself posted upgraded crossover designs.
The P.E. Dayton Audio DIY kits did not fair all that well. Has anyone here heard them? I have not heard either set. The Samba RS drivers are still obviously extremely good reasonably priced drive units. The cabinet is solid but that crossover is just really short of a good design. What gives...
www.audiosciencereview.com
Baffle layout is absolutely important for horn loaded designs. The baffle step transition often occurs before the crossover region, and woofers can still experience edge diffraction. Fairly big difference between designing a bookshelf, tower, and in-wall speaker for example, even if they all used the same drivers.
Yes, unless a company provides measurement data without any baffle influence you will have to measure the drivers yourself. It isn't really that difficult or expensive, just time consuming, because depending on the speaker construction you may need up to 72 measurements, for a fully asymmetric 2 way speaker. From my experience, this takes about 2 hours, although you can speed it up with a motorized turntable.
If you want to just "eyeball" the directivity of a speaker, the diffraction sim tool in VituixCAD may help. You can simulate the baffle behaviour for each driver, for example a 150mm woofer and 26mm tweeter, then export that data into the crossover section. Just remember that when using digital correction such as Audiolense, you don't want a flat in-room frequency response. Flat anechoic results in a downward slope when placed in-room, which is what sounds good + natural.
