Turbosound Madrid. They compare favorably to the JBL SRX712m, and can be had for under $500. I bought one a few weeks ago (after a previous thread by another poster) just to find out if they were worth a hoot, and did a bit of listening side by side with one of my 712s (I own 12 of these...). I simply switched the speaker cable from box to box. Full range, only.
I powered them each with one side of a NU6000 (X32 mixer) and played various tunes for a couple of hours as loud as 115 db @ 4', A, C and non-weighted, fast and slow. They sounded quite similar, get loud and stay clean, I heard no distortion, with no EQ or High Pass used. The difference I noticed with the Madrid was a SLIGHT "honkiness" in the lo mid area, relative to the 712.
I went back a few days ago and did some more listening under the same situation and decided to EQ the Turbo to try for a close match to the JBL sound quality. I swept the lo-mids (12 db added gain) to the Madrid and found the maximum "honkiness" at 170 hz and ended up cutting 170 hz by 9 db, Q of 3. This came very close to the sound of the 712, certainly quite doable for gigs requiring the performance of a 712. IMO
I'm going to take the Madrid to a gig in June and replace one of my JBLs in order to give it the acid test...
Cheers,
-Tim T