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Opinions On AR-12 Speakers

As a follow up on the AR12's I highly recommend you remove and replace the ferro-fluid on the mid range every 10-15 years as its true performance depends on it. The mid range cone has NO spider mechanism whatsoever and floats in the ferro-fluid providing true linear movement. I can get dried and "gunked up" over time but it is relatively easy to r&r.
Hi Taineasy,
I have a 12 mid that requires the ferrofluid be replaced (it’s gummed up by old fluid), but can’t find any method to do this outside of reconing the driver. It sounds like you have experience in doing this. Can you let me know the steps and process you used to do this? Thanks in advance...
I'd also love to know the process for this... I have a set of AR12s and one mid seems slightly sticky.

I also have a set of AR12s and one mid also seems slightly sticky. I'm in the process of refoaming both midranges. One mid seems (visual inspection as far as possible) to have a bit less ferro-fluid than the other mid. I'd also love to know the process for remove and replace the ferro-fluid on the mid range. See picture: Do the screws need to be loosened? Can someone give me more instructions or advice?

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I believe the mids have 1-inch voice coils. For example, is this product okay?: https://www.parts-express.com/Ferrofluid-100uL-General-Purpose-for-1-Diameter-V.C.-340-540

Without loosening screws/opening the midrange: Does it make sense to add drop per drop ferro-fluid to one mid (with a syringe?) until both mids move just as easy?
 
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Back in the 70s I read a lot of Rolling Stone which in those days was a great publication as was Esquire. Stereo equipment was the big deal along with cocaine and drunk driving. I was sick of my Quadraflex system and spent a lot of time researching equipment. I finally walked into Pacific Stereo and paid the hefty amounts for a Sansui 8080 ($500) and a set of AR12s.($250 each) Already had an AR XB turntable so I was fixed up pretty good. Over the next 40 years I really enjoyed that system. In about a couple of decades I happened to notice a change in the speakers and removed the foams which proceeded to fall apart. I saw the surrounds on the woofers were ruined as well. I ordered a new set of woofers and new foams from AR and installed them. That turned out to be a timely problem because although the new surrounds went away, the foams up front are still perfect. I recently replaced the surrounds on the woofers and mid-range and they seem to be about the same great speakers. The 8080 eventually started losing lights, so after 25 years I took it into a stereo repair shop next door to the office. I made two mistakes that time, I didn't mark the unit in some way and I told the guy that they were becoming valuable. He said that he had a couple of old ones in the back. You've probably guessed what happened next. When I went next door to pick up my receiver, the guy gave me some other machine. Mine was perfect, one owner babied and like new. I told him that I wanted my receiver not this turd. He denied everything. Had this happened 30 years earlier, say when I just came back from Vietnam, I would have just gone nuts and been arrested and not give a s***. It may have been just cover and knobs, I don't know, but I was pissed. Lesson learned and one Asian stereo crook got to go home to his family. Now my ears are wrecked from the war and I'm 78 years old, but the Sansui and AR 12s turned out to be a pretty lucky buy. It still works perfect and God only knows what I'm not hearing.
 
Hello All,

I am an AR 12 owner. I sent the woofers to Larry at AR Vintage Repair today. I have removed the tweeters and the mids and plan to work on the cabinets first as I know how to do that.When I hooked them up to my Cary integrated tube amp and played Pink Floyd through them on the turntable, my Labrador came running into the room and was turning her head from side to side standing right in front of one of the speakers - they sound that bad! Scratchy, muted, horrible - so they definitely need work. I opened up one of the mids and the foam inside the canister was clean but looked dry. I haven’t done anything with the tweeters yet. I am handy and have restored speakers before but the drivers were all ok. I am hoping these will be my last speakers. Any recommended first steps? Any help would be greatly appreciated. I can and will supply photos if they would be helpful. Thanks all!
 
This is what the mids look like from my AR 12’s. Any ideas? The insides of the black “planting pot” is clean and looks new. I am guessing the oil is under the copper looking thing that the speaker diaphragm is in? The first photo is a nice looking driver. The second photo is the one that concerns me most.
 

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As a follow up on the AR12's I highly recommend you remove and replace the ferro-fluid on the mid range every 10-15 years as its true performance depends on it. The mid range cone has NO spider mechanism whatsoever and floats in the ferro-fluid providing true linear movement. I can get dried and "gunked up" over time but it is relatively easy to r&r.
Can you share how to r&r? Thanks!
 
I like mine fine,....although, after giving them their 3rd set of woofer surrounds since new,...they may be a little lean on bass now,....due mainly to slim pickens. No one seems to offer any ar12 specific kits anymore if ever, especially (notice the lack of ck's and X's....lol) the mid foams.

Like my AR-48B's' also.
 
Thanks for your feedback. I was able to find the proper mid foams at Midwest Speaker Repair (F3-1 kit) and Simply Speakers for a foam with 2.3125 diameter cone. The cones seem to move freely enough, so I'm going to leave them alone. I even have an extra pair of mids that I somehow was lucky enough to find them years ago. Hopefully, I'll have these bad boys up and running soon.
 
Thanks for your feedback. I was able to find the proper mid foams at Midwest Speaker Repair (F3-1 kit) and Simply Speakers for a foam with 2.3125 diameter cone. The cones seem to move freely enough, so I'm going to leave them alone. I even have an extra pair of mids that I somehow was lucky enough to find them years ago. Hopefully, I'll have these bad boys up and running soon.
"Thanks for your feedback."

Us curious orange D's have to stick together.
 
I had acquired AR-12 cabinets with no drivers and had to buy all the drivers separately. The "replacement" i did find has the round magnet and it it is marked as a replacement for 2ax, 5, and AR 14. The woofer never ended the "convo" until now. You haven't missed a thing.
 
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