I'm now investigating wideband/mid candidates in the 2"-3" size to go into my a-pillars and depending on results, leaves me the option of popping decent small tweeters behind the factory tweeter-equipped door sail panels for 3-way fullness.
I'm looking at specs for:
Dayton RS75-4, super cheap (I have a dealer PE account
)
CDT Unity 7.5 (due to higher sensitivity over the U8)(refurbs are pretty cheap)
Aries SK 3 (pretty inexpensive)
Hybrid Audio Unity U2 (just over 2x as expensive as the SK 3 pair)
Hybrid Audio RAM2 (nearly 4x as expensive as the SK 3)
I'm price sensitive first, then drilling down by performance between 5KHz and 18KHz (my hearing pretty much falls silent above 16KHz).
The Dayton is the least expensive by a quite a bit, although the SK3 can be bought with a Hybrid tweeter for $162 right now and whether I use the tweets or no, that cuts the per driver cost down.
If I went for CDT, I'd just go for the refurbs to save cash, but I'm conflicted since I can't aim them at my windshield, CDT's info is kinda sketchy, but Jtrosky loves his...so, idk...
The Hybrid Audio RAM2 is obviously more expensive and I haven't found much in user reviews in a 2-way setup despite seeing install pics on their website in pillars and sail panels.
I suspect I'll just have to buy something, try it and see if it satisfies and if not, buy something else to test, rinse and repeat and then sell off all the drivers that didn't work out.
I wish I could hear a wideband demo car or even a car with a 3-way system and then have the tweeters switched off and determine whether I can discern the difference.