Originally Posted by Martycool007
Ok, so you think going with a 2 way design using the IWATA/Radian/Truextent combo would be the way to go over a 3 way design? Point taken about crossing over at 500hz and letting that combo handle everything above that. This is going to be a major investment for me, still mulling over how much better this combo would perform compared to the much cheaper B&C/ElipTrack combo. If it is substantially better, then I will just have to start saving!
I don't know anything about the ElipTrack horns. Do you have a link?
First, IMO 2" throat horns are outdated as is the use of a supertweeter crossing around 8khz. The only case for a 2" horn is as a low midrange covering ~300hz-1500hz. I personally think JBL is behind the curve in their K2/Everest approach although I understand it is hard to sell a $50k speaker that rolls off at 16khz and instead needs to be flat to 50khz. That is just marketing BS.
Modern large format drivers are almost exclusively 1.4 or 1.5" exits which allow for pretty good extension to the highest required registers. What you basically have is a choice between a 1" throat small format or a 1.5" throat large format. The 1" allows for good response and directivity up to about 18khz while the 1.5" will go to about 13khz before beaming badly. On the other end, 1" exit drivers won't play below about 800-900hz whereas most 4" diaphragm 1.5" throat drivers will play down to 400-600hz. It is a tradeoff.
The other part is that the small CDs can use inexpensive but quite nice sounding mylar diaphragms. The large format drivers must use a metallic diaphragm which is far more costly. This is why titanium is used. It is lower performance, cheaper and super durable. This is good for pro applications and bad for home use. The exception being coated titanium like JBL's aquaplas or 18Sound's TiN. Aluminum sounds better than titanium, but doesn't play the upper HF well and is less durable so fewer companies are using it. I believe just 18Sound and Radian use it now. The ultimate option for home use is beryllium. The downside is that it is very expensive.
So what you should do should be based on budget and tradeoffs acceptable to you. With a lower budget, I would stick to a high quality 1" design using the SEOS-15 and a very nice woofer. I would suggest doing this over the Iwata with a titanium diaphragm. If your budget is higher and you don't mind the narrow horizontal beamwidth of the Iwata's top end, I would use it with the 18Sound ND2060A. It is an aluminum diaphragm and I've seen it for sale at $300. For $400 you could do a Radian 950PB. It might play better lower since it has a 4" diaphragm vs the 3" on the 18Sound. These are both better than the DE750TN. One big advantage of going with the Radian is that you could upgrade to the beryllium at a later date.
I personally prefer a more constant directivity horn so Iwata is not what I would choose, but that is kind of a personal choice. Among the non-constant directivity horns, the Iwata would definitely be a top choice. I don't know anything about the ElipTrack.
There are two other routes that are IMO better than all of the above for pure performance. One is to use a cone midhorn to cover about 300hz-1500hz with something like a SEOS-12/15 or a E-JMLC-1000 and your choice of high quality 1" CDs. The tough part is that you would probably need to build your own midhorn or base it on something like the Pi 7 cornerhorn. You also need a 3-way crossover which complicates and adds cost.
The final option is a synergy clone which is IMO the pinnacle but not easy to pull off on nearly every front (finding right mids, crossover, woodworking). It is really the best of all worlds.