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  1. >I also recall having read the same detailed information from Stereophile, and I assume its correctness against what appears to be a sort of revisionist article containing conflated timelines, unattributed premises and boot-strapped conclusions. >I've been wishing & hoping for Tom Tyson's definitive AR history for years...would a GoFundMe effort be in vain? —ar_pro Book: The History of Acoustic Research Any and all suggestions and ideas here would be greatly appreciated! Any thoughts about what you would like to see would be great as well. To do a complete history wo
  2. Hello everyone, I opened my AR9 to check insides, see if original capacitors ..etc. Actually an impressive set of coils and caps inside. Question: My sealing gaskets are rock hard, I'm thinking I have air leak. What are the recommenced sealing gaskets or sealing tape for the 12 inch woofers? I read in the manual that each time you open the woofer the gasket needs to be replaced; does this sound reasonable? Here my pictures. Thanks for your input. Bill
  3. A 100 mile drive (each way) made me the proud owner of a pair of AR9's and 10pi speakers. The 10pi are almost perfect. Just a small back corner chip on the top of one and dirty and thirsty for oil. They should clean up nice. The drivers in the 9's are all good. One speaker has lifting of the veneer on the side/bottom. The MDF has swelled some. These too need a good cleaning. The side grilles are original and all but one has a small hole in the fabric. The front grilles have been replaced and need to be stretched better. Its odd but these have the plastic pegs reversed - mounted to th
  4. I bought a pair AR9s new when I worked at Teledyne MEC in 1980. I really enjoyed listening to them over the past several decades but, unfortunately for me, I've developed severe tinnitus from years of motorcycling and various acoustic traumas and I can no longer listen to music (or ride). It is quite heartbreaking. So these awesome speakers have sat unused for the past 4 years and I know I need to part with them, I'm just unsure how to go about it and I thought this forum would be the best place to start. I don't know how to determine their worth. Although I can't hear it do
  5. Several months ago I was fortunate enough to acquire a pair of AR 9 Speakers in excellent condition with the exception of surrounds. These were a one owner speaker, came with the original boxes, original sales receipt and two sets of manuals and all the brochures. I have had the surrounds professionally replaced and all speakers tested. The cabinets are close to new showroom condition. So I have read a lot about the crossovers, both on this site and talked to many local audio pro's about wanting to replace the capacitors and the one resistor in the upper mid range circuit. It
  6. Maybe you guys can help me make sure I get this right. Shouldn't be difficult but there may be some things you might offer up as I go here. As you may recall from my AR9 thread, while the 4 woofers all worked, they had been refoamed along the way. Rather oddly as can be seen in the photos. Almost like they put them on upside down just to get them to fit. Must have not had the correct surrounds. I removed the old surrounds on 2 of the drivers last night. Came off fine, but I will scratch at the edges a little more maybe. I like to use a dull exacto blade to help as I go. Since these were
  7. I've just uploaded some AR speaker reviews from High Fidelity magazine to my server. You can access them here: https://archive.mgm51.com/library/AcousticResearch/
  8. yes, they already sold for less than $200... https://denver.craigslist.org/ele/d/yamaha-surround-sound/6556688430.html But you can still get the surround sound system for $65
  9. 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)?
  10. One would think that after 38 years of living with and listening to a set of speakers that being surprised would not be on the menu. But, I have to say, Wow, just Wow. This evening I've been listening to some acoustic rock on the AR9's I bought back in March 1979. The solid imaging and the presence of the vocals still causes me to sit up and pay attention. No, let me change that..... Wow, just friggin' Wow.
  11. Several months ago I was fortunate enough to acquire a pair of AR 9 Speakers in excellent condition with the exception of surrounds. These were a one owner speaker, came with the original boxes, original sales receipt and two sets of manuals and all the brochures. I have had the surrounds professionally replaced and all speakers tested. The cabinets are close to new showroom condition. So I have read a lot about the crossovers, both on this site and talked to many local audio pro's about wanting to replace the capacitors and the one resistor in the upper mid range circuit. It
  12. I say casually looking since my speakers are playing very well, just that there are cosmetic issues from a previous reform attempt, and would like to eventually replace the woofers. Anyone have a pair or one for sale? Needing foam or not is no issue. I also have a nice AR9 style woofer I can trade for an AR3a woofer. Thanks!
  13. Sometime back I brought up the topic of modifying the AR-9 bass crossover network. Many thanks to Roy C for his comments and insight in this area. For those of you not familiar with this topic I have included the bass crossover schematic attachment My original question was based on speculation about what were the sonic effects of cutting loose the coil/cap that form a variable attenuation for this crossover. Holl noted in his design notes that these additional components contributed two aspects to the crossover function: 1) the combination of cap/coil added resistance at all frequencies hi
  14. I scanned the AR9 Owner's Reference Manual and put it into a single PDF file. At 102MB, it is too large for me to upload here. However, you can download it from my server: http://archive.mgm51.com/library/AcousticResearch/
  15. Looking for a pair of AR9 speakers with cabinets in good condition. Near Massachusetts. Contact me thru the PM system.
  16. I've been emailing with a CL seller on a pair of AR9's and I keep telling him he needs to send me photos of all the drivers before I commit to a long drive. I got one picture of one of the woofers. The surround looks nice and wide BUT the cone does not look right to me. Any ideas on the originality of this woofer being an authentic and original AR woofer?
  17. I looked at a pair of all original AR9’s for sale. Of course they need refoaming but the main concern is NO SOUND from either high tweeter. (meaning the high tweeter on each speaker is not sounding) The speakers have had 2 mature owners and reportedly have not been abused (and show no signs of it). Is this more likely to be the tweeter itself or the attenuation switch? The switches for the low mids and the mid range dome function properly. This would not be a result of missing jumpers on the back panel speaker wire connections could it. (the jumpers were in place but possibly may no
  18. Now that I have all the drivers up to par on my AR9's I want to start focusing in on the caps. The speakers do sound great as is but the caps are all the original callins with the 5 of the lower values being the black and reds. Also, the exterior condition of the speakers (pretty rough) suggest to me that these may have gone thru some heavy and potentially abusive use along the way. I initially would like to only replace the upper range caps, but do plan on measuring the others (all the metal case ones) to make sure they are on par with spec. I may even take them into my tech for thoro
  19. ****WARNING**** This thread is not for the faint at heart. Thread contains graphically disturbing images that may leave a lasting impression one may not want. Proceed only if you think you can handle it without severe traumatic stress. On my trip to pick up the ADS L1590's (see ADS section) I mentioned to the seller (over a 2 hour lunch where we talked about this wonderful hobby) that I had the AR9 on my bucket list. He says "I know where a beat up pair is you could probably get cheaply". Needless to say, the hair on the back of my neck stood up. We quickly headed to our new destination. A
  20. Just popped up http://buffalo.craigslist.org/ele/5433560252.html
  21. 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?
  22. Last night a couple of my new neighbors stopped by for the evening. There was food, beer, and wine. And music. The age of this couple was maybe 25, 26, if that much. (aside: I find that good music transcends genrations) But what they said to me was amazing. They wanted to know where I bought my speakers, beause they wanted a pair. When I told them that I bought the speakers (AR9's) before they were born, and that Acoustic Research is no longer an ongoing business entity, you should have seen the sadness in their face. Well, if nothing else, at least I broke them of the MP3 habit. But I w
  23. The mystery of the 6uf cap in the AR9 schematics that is. My new to me 9x's have the 6uf cap instead of the 8uf cap that the 9's have. I wonder if the change in the caps is why these are 9x's. I am taking pictures as I go and will post them at a later date. These were modified by a speaker shop and I plan to bring them back to what they once were. Luckily they left the original xovers alone, they just added to them. They didn't even recap them when they did the modes. Harry
  24. I scanned the AR9 Instructions booklet into a single, high-quality pdf file. The Instructions booklet resembles a 'quick reference guide' for the speaker, as opposed to the much larger Reference Manual. The pdf is too large to upload here, but you can download it from my server: http://archive.mgm51.com/library/AcousticResearch/
  25. I found an old folder in my file cabinet with some older AR9 literature and stuff. Here's a review. I have it also in single-page PDF format, but it is about 4MB in size, and I cannot upload it.
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