Yes your bang on the money they used modified units in there cabinets they are still using the same cab design 30 years on . i only have two out of the four drivers so i need to make a decision. Do i refurb the two drivers and split them other the two cabs and replace the back drivers with basic drivers. Or do i chase and hunt for rowen drivers wich apart from a website seem to be ghost.Interesting, I had never heard of Rowen speakers before. Looks like they used Acoustic Research drivers in their own cabinets.
Somebody must be able to input

Thanks for your input they really are lovely . Got a lot of work to get thes mint again . Here's the deal each cabinet has 2 woofers 1 front 1 back problem is I only have 2 out of the 4 the previous owner removed the rear speakers as they got the rot first then he lost them (f King gutted) I can not find anything on these speakers other then a website . I think my only option is to source standard ar drivers for the rear and reform the front r2 ar s . Do you think this makes sense . I will most definitely post videos when there done .The only descriptions I could find of these called them "high end," and there's no doubt that the company spared few expenses in construction. Look at the wire guage in that inductor! And nice caps, too. I agree with Toxcrusader - I'd give these a listen before reflexively changing the caps.
Looks like the only real chore ahead of you is finding proper surrounds to restore the woofs, but considering they are AR-sourced, that should not be a problem.
How about posting a video of these in action once you have them up and running?
GeeDeeEmm
Yes your right I'll be patient you can't rush art . The rear have cables also looking at pics from old brochure I will see if I can upload it explains why they use 2 woofers and the wedge design .Oh that sucks that the woofers are gone. You're sure they were active woofers and not passive radiators? Should be a pair of wires hanging loose if they are active. In which case just get the number off one of the others and google/ebay it. Someone here at AK may even have one.
You really want to get the correct woofer. As you may already know, woofers interact with the cabinet much more than the other drivers, in addition to all the other interactions drivers have with each other and the crossover. Woofers are fussy to replace. To get the correct sound you need the correct original, and failing that, something as close to original as possible - which would mean testing the ones you have. I'd search for correct originals first, be patient, and if you can't find them after awhile, AK will help you select replacements
In the interest of gauging further possible in interest in discussing my desire to recreate the rowen model with actual AR mids and tweets as well as the possibility of newer and very good and also available third party mids and tweeters by the way I'm a very good Carpenter I say humbly only to say that this possible help recreating two sets with actual Rowan woofers and rebuilt condition would be an answer that so any response and it's quickly as possible would be appreciated as I consider the purchase.