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Found 9 results

  1. Many of you recall from my post titled "AR-9 / AR-90 Crossover Re-capping Adventure" that I had a heck of time trying to find the proper combination of the attenuation resistor switches to achieve acceptable results. People probably thought I was crazy or losing my hearing. The culprit was the 24uF Solen MKP 400V capacitor installed inline with the Upper Mid Range (UMR.) It was all over the place depending on program material. It sounded anywhere from great to shrill and exhibited the uncanny ability to drill down into a recording, extract whatever grain is there and put it front and ce
  2. Being big on spare parts I've been acquiring spare drivers for my AR90's. I've been successful with all drivers except the LMR p/n 200027-0. They seem to get swiped up quickly on eBay. I've parted out (3) AR94 speakers. The full range/mid drivers are the ones that came in the AR9LS p/n 2100450B. The woofers used p/n 2100370 and look more like the 200027-0 LMR. Can I assume these 8 inch drivers are all pretty much the same? Which would be the better replacement to use (should I ever need to)?
  3. Finally happened.... no 'dumpster find' but close... As I was walking to get a Sunday newspaper today I walked past a set a speakers and some other items in a pile with a "free" sign propped up against the speakers. The speakers were a pair of AR90s complete with both front and side grills and all the acoustic foam insulation still in place and like new. I called my wife to bring the truck (didn't want to leave this find alone!) and the 90s were quickly loaded and driven to my garage. Inspection the speakers: physically the boxes are great with no nicks or missing wood, tops will have to
  4. I decided it's time to begin my adventure into rebuilding the crossovers in my AR90's. AR Surround's thread kind of got me to it. Also I have noticed the Right speaker (UMR) was not quite as loud as the left - so its time. I pulled a woofer to take a peek. One crossover was very neat and looked easy to remove the old caps. The other was well, uumm ........ here's a picture. Looking for ideas on how to clear away the mass amount of glue. The glue is still a bit gummy but still hard. My wife and son go away during April vacation to Newport so that's going to be prime time to work on them.
  5. My amplifier's right channel went south and took out both woofers. The voice coil resistance check shows they are burned out. What are my options?
  6. I just bought one of these and the seller has another. Very nice condition and good price. eBay item number: 331907115846 Here is a rare 1978 find for the Acoustic Research speaker fan; a full size original AR-90 advertisement poster measuring 27 1/4 X 34 1/4 inches on medium stock. Never displayed, it is in near mint condition for its age. Signed within the poster's design by the recently deceased artist Frank Modell, a cartoonist who regularly drew for New Yorker magazine. Poster will be shipped rolled in a mailing tube for maximum protection. I am sure there ar
  7. I recently picked up a pair of AR90's from Craigslist in fairly rough condition. The price of $100 was right, but one speaker appears to have been dropped with enough force to crack the base of the cabinet. Both will eventually need refresh on the walnut finish, foam surrounds, and capacitors. The one speaker that was dropped has a woofer with a tear in the paper cone. I've attached pictures to solicit ideas on how to best restore it. While I could glue it with some high strength epoxy, I really can't tell if there is coil rubbing or spider damage leading to a driver not functioning to s
  8. Ever since re-capping my AR91s with PP caps I've wanted to do my AR90s. I have a question on the tweeter crossover difference. The 91 has only a 4uF cap in series with a .2mH coil in parallel and the AR9 and 90 have a 0.105mH coil with a 4uF and 6uF caps in series. I'm wondering what the 4uF and 6uF in series does. Is the difference only because of the coil difference?
  9. Yesterday I got to replacing all the caps on the LMR, UMR, HF crossover board in my AR-90s. I did this with the crossover boards in place. I found it quite easy to get adequate access by removing both woofers and using a small flexible neck lamp to give me great illumination. I purchased the caps by mail from ERSE. They arrived promptly and all are 250V but in spite of this their sizes were suitable for replacement in the same locations occupied by the original caps. ERSE didn't have a 40 uF cap so I bought their 39 uF caps and parallelled with a couple of old GE nominal 1.2 uF caps I had a
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