Just another plug for Selah speakers. No, I have no affiliation with the company. I'm just a satisfied customer, who purchased their cheapest kit to make a pair of speakers for mom in law, that turned out to sound way better than they had a right to for the price paid. My feeling that if the cheap stuff can sound that good, the designs using better drivers should be off the charts in terms of value.
The previous poster linked a speaker that uses a Fountek ribbon tweeter, which Rick Craig from Selah has been using for a number of years now. The Fountek is a fairly inexpensive ribbon that Rick thinks is one of the best values out there. The reason I found it interesting is that recently Rick has moved to doing some designs using Raal ribbons. The Essato (Black 3 way) using Accuton (Karma, Maarten) drivers and the Mejor (ligher wood two way), which uses a Scan Speak Illuminator woofer and a larger Raal tweeter.
Here is what Rick said about the Raal Tweeters.
... just finishing up a SOTA monitor (Accuton woofer and mid) for a NYC area customer. The RAAL ribbon tweeter is so good I can't wait to hear its' bigger brother
That design is next...
... Scan-Speak Illuminator and the RAAL in a monitor for Arizona.
Apparently the Mejor is headed to Arizona, it may be worth your time to contact Rick Craig to see if the owner is in your area, and maybe you could get an audition. My guess is that if you love the sound of your Uni-3's one of these two designs could give it a good run for it's money, crossed over to your JL subs.
Stereophile comments about a Crystal Cable speaker using the same tweeter and Scan Illuminator Woofers.
http://blog.stereophile.com/ces2009/see-through_transparency/
