Hobie, be careful those speakers look like they could do sheet metal damage if turned up too loud near your vehicle.
Give us some stats/background etc pls.:
Well, I have had alot of the high end speaker systems out there through the years ( Magnaplanar Tympani IVa, Mirage M1) and they were all in-efficient pigs eating up all the power you could feed them and still lacking in the dynamics, and then I built a few....this is the last set I built 8 ft tall.
so I found a set of the Klipschorn speakers to go listen to. There was the dynamic impact I'd been missing all those years, so I then go to the Klipsch forums and found out that there had been a successor to the Khorn called the Jubilee.
The horn loaded bass bin has the tightest, most dynamic bass I'd ever heard, so I was going to build a set of the bass bins as the plans are available for the DIY'ers. I started investigating more horn loaded systems and found the guys who were into the old Theatre system components. The hoy grail was the 1939-1949 or so RCA systems with all Field-Coil drivers. The bass bin used (2) 15" woofers and was then crossed over to a 9 or 15 cell horn up on top driven by (2) RCA midrange drivers that went up to 11k or so. I had a premonition that there was one of these in the old theatre in my hometown in Ky, so I called my buddy who still lives there and he went down and found out that they had just recently unhooked the original speaker system and indeed it was an original RCA Shearer system.
So he talked to the owner who said we could have it. This was on a Sunday, so he said that we could come back and get it during the week. When my buddy went back he found out that the third owner of the theatre had gotten up and disconneted the midrange horn and taken it to the dump. My buddy goes to the dump and talks to a guy who tells him he remembers a lady throwing them in the back of the trash truck and it has gone to the landfill.

The pair of RCA Field-Coil midrange drivers currently go for 3500.00 a pair as there are estimated less than 100 of them in existance. So these dumb-a## inbred ignorant back-woods small town Ky. rednecks have destroyed a part of audio history.

So anyway my buddy did go back to the theatre and manage to get the large bass bin which had one remaining 15" woofer in it, and also the RCA amp that powered the speakers.
We sold those to a guy in Pa., who has a RCA field coil speaker museum. One of the guys on the Lansing Heritage forum then talked me into keeping the bass bin and loading it with a pair of JBL 2226H woofers which he said he had done and toured Austrailia with back in the 80's. So I'm going to be getting the bass bin next week and then I'll see how good this thing really is. I have to say that all the movies I watched as a kid had this speaker playing behind the screen and it filled up the whole theatre, so it should fill my 20x22 garage up really well...especially when driven with a Crown amp. The original field coil drivers were driven with a 45 watt tube amp and filled up the theatres, so 2500 watts should be REALLY good.
I'm going to lay the speaker on its side which will fill up the space I have below my 110" projection screen on the front wall. The speaker will be 7ft long and 42" high and 30" deep which will serve as a great workbench. I'll likely put two hinged doors on the front covered in grill cloth. In this space here.
Instead of using horn midrange drivers, one of the JBL guys talked me into using the Audax pro sound 6 1/2" midranges that are 99db eff, so two of them spaced close measures 105db/w 1 watt, which is what the bass bin puts out, and he says that it doesn't have the horn colorations that become annoying and cause listener fatigue. This same driver is used in the Waveform Mach 1 speakers ( 17K ) and the Jadis Eurythme ( 45k ) so it is a proven high end reproducer of the critical midrange area.
I'll let you know how it turns out and post some more pics of the final resting spot.