Originally Posted by MBentz
Are you saying there is no benefit to increasing the density of the semi-reverberant decay?
I'm not suggesting that. I'm suggesting that energy reflected off the floor and ceiling should be minimized. Of course if you could design a room with adequate floor and ceiling treatments in a home there might be some benefit, but that is still questionable. I've seen very few homes with ceiling treatments and I'm not even certain how you could treat the floor assuming the floor between the speakers and listeners remains a usable space.
It isn't like a 40-60deg coverage horn means there is zero energy being reflected by the floor and ceiling. It means that it is going be attenuated which is good. It is difficult to make floor and ceiling reflections late which would be better.
I subscribe to the idea that late reflections are good reflections and if they can't be late though should be attenuated. Obviously that is very general, but that is basically how I look at it.
Then you have the issues of multi-channel vs 2-channel and how that should be treated. BTW, I'm only referring to the media room/HT/2-channel application. I have no qualifications or experience in the recording studio realm. It is definitely different although the basic principles do apply.
I mentioned earlier that it would be ideal to have no coverage beyond what is needed in the vertical which is probably no more than 20deg in most homes. Of course that is not practical partly for the reason you mentioned where a narrower pattern needs less width or height but more depth than its wider counterpart. I think that 90x50 or 90x60 is about the best compromise between the ability to hold pattern in the along both axes. It is no coincidence that most horns are somewhere around 90x40 to 90x60
That is pretty much what I was thinking with the JMLC or an approximation of it creating a massive roundover and directivity more slowly collapsing from 180deg to 90deg from 500hz to 1000hz. Holding 90deg pattern that low is not important. Below 1khz, Id simply want the pseudo-JMLC's horn loading effect.
Do you happen to have an Axidriver model with a 1.4" driver instead of the 2" driver? It should show better directivity past 7khz.
This would be similar to the 18Sound XT1464 but with wider horizontal directivity which I think is beneficial in the home. It would obviously be a fair amount wider, but not as deep.
I believe the 18Sound NSD1480N has an exit angle of 10deg. I'd like to find out what the 18Sound 1460's are and what the Radian 1.4" drivers are as well. IMO those are going to be the best drivers for this application. The Radian 636PB is only $200 in the US so that makes this very feasible.
IMO, this will be a better setup than the JBL 4722-HF (the horn and CD portion of the JBL ScreenArray). That runs ~$700, has the unwanted screen compensation, it is 30" wide and you are stuck with a titanium phragm. The Radian plus this horn should be be less than the JBL combo, in a more manageable package with hopefully fewer warts.