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  2. AR-2ax Project

    Given that this thread is 9 pages long I figured I would summarize the general steps I took to restore my speakers. This does not include any of the cabinet restoration. This is not intended to be a recommendation for anyone venturing into the restoration of a pair of Acoustic Research speakers, it is simply one man’s ADHD rabbit trail to reach the point of having a fully functional, nice sounding pair of AR-2ax speakers. In the beginning I saw a pair of AR-2ax speakers, and they were good. I saw that the foam surrounds on the woofers were bad so I knew that when I tested for audio I would need to do so at a very low volume to avoid damaging them. I heard sound from woofers but nothing from the mids or tweeters. Turned the pots to see if I could get sound from them. Pots were very stiff and I still could not get sound from mids or tweets. I carefully removed the woofers. After lifting the first one up I decided to take them outside to continue because the rock wool inside the cabinet was very broken down and small particles of it were floating around my living room at this point. I really didn’t think about what would be inside them. I have only taken apart newer speakers up to this point and they all have had poly-fill. After removing the rock wool I took my air nozzle at a low pressure setting, got behind the speaker, put a cloth over my head and face, and blew out the cabinets (I am not recommending doing this, just reporting what I did). I found them so much more enjoyable to work on them with the insides cleared of that dust. I then applied a very low volume signal to each tweeter and mid at the output of the pots. They all worked. They also ohm’ed out good. I took pictures of the wiring and components inside since I knew I would have to remove and replace things. I then removed the tweeters and mids because with my 6’5” frame and large hands there was no way I was going to work inside the cabinets without doing so. I then clipped the wiring, I used a pencil to mark the location of the boards, then carefully removed them. I have a tack removal tool that works great for removing staples. I removed the pots and opened them up. There was more blueish green corrosion than metal inside. I soaked them in a solution of salt and vinegar then took a soft tooth brush to clean them up. The discs were very pitted and chipped. Decided I would need L-Pads. The particular speakers I had were originally manufactured with cloth surround woofers. I was informed that the original cloth surround woofers and the ones with foam surrounds used different inductors. When the woofers in my speakers had been changed out, the inductors had not been changed so I had the wrong coils for the existing woofers. I had two choices, re-foam the existing woofers ($26) and purchase the correct coils ($25) or purchase a pair of cloth surround woofers ($$$). I decided to purchase cloth surround woofers. I purchased a pair of 6 ufd caps and a pair of 3.9ufd caps to replace the existing ones. I purchased 4 L-Pads and 2 25ohm 10w. resistors to replace the pots. I wired up the L-Pads, capacitors, and resistors. I made up a schematic to make sure that I had the wiring right. I had some weather stripping in the garage to use for sealing the drivers. 3/4" wide x 1/2" thick. After scraping all that nasty black stuff off the drivers and the cabinet and putting in the weather stripping, I installed the tweets and mids and wired them up. I purchased 4 bags of the pink home insulation, from Lowe’s. Home Depot sells a similar insulation in yellow that can also be used. I stuffed 2 bags into each cabinet leaving the woofer wires hanging out of the cabinet. I then wired up the woofers and installed them, sealing them with the weather stripping. I had a few issues that I found with the woofers which were easy fixes using epoxy and glue, and which I will not cover in this summary. I then hooked up my receiver to my speakers. I gradually turned up the volume, listening for any issues. I got them up to a volume beyond normal listening levels and they still sounded great. SUCCESS Well worth the effort. I leave you with this quote: “Always remember the last words of my grandfather, who said ‘… a truck’” Emo Phillips
  3. AR-2ax Project

    they are. I'm not gong to spend much time or money to restore them. I'll clean them up, patch the corners (that is not the only damaged corner) and test them out. The guy who gave them to me really liked them, he just stopped using his stereo system when he found that his hearing was going about 10 years ago. He said they just didn't sound right with his hearing aids. We will see what happens, need to finish they ARs first.
  4. Today
  5. Classic KLH Model History

    I've not seen ribbon tweeters in an early-ish KLH before.
  6. AR Turntable thread

    Nice 'table Jason! The XB has the advantage of having the cuing mechanism. The weaknesses of the XB are the tonearm--not as good as the XA but you remedied that with the Marc Morin mod (Steve Frosten also does these mods). The Technics tube "looks" original but allows the use of universal headshells. Sometimes a heavier counterweight is needed but those are available from Larry Spence (Vintage Analog Restoration). the base. The XA had an awful-looking vinyl clad particleboard base. YOURS OTOH is BEAUTIFUL! Did you build that yourself? Do I see a deer hide mat on there? And what are you using for feet?
  7. Hi Tom, just touching base with you to see if you might know of a potential source for some AR 3a midrange domes. I need a couple for my AR 3a speakers . Also , along the same lines, I have a pair of AR 5 domes that were trashed ( they were shipped minus the protective screens). I have managed to get them working again but am now in need of the protective screens. So, if you would happen to know where I might get a couple of these screens (from dead AR 3a or AR 5 midranges or ?) I would be very grateful.

    Thanks for whatever assistance you can provide.


  8. A Nice set of LST's on CL in Albany

    1-18-18 Hi Mike, your theory of the X-over may be the reason, others more knowledgeable in those areas can comment better than I but, it sounds plausible. Nonetheless, I’d swear that the LST’s do project a ‘larger’ sounding bass with most music. Though it’s immediately noticeable and defined, it’s not like it’s an extreme rise or bump in their frequency response. Generally speaking the overall presentation of the speaker is so much larger than say, the AR-3a so initially one may be impressed with that characteristic before you can pick out individual qualities. Again we’re speaking generally here and correct adherence to room placement, type of program material, etc., all will have an influence on one’s impression. My system’s qualities and the amount of input power will affect one’s opinion in that a larger amp will allow a much ‘bigger’ and life-like presentation overall. In other words my larger amplifiers have the ability to produce a larger sound-scape at most listening levels as compared to a smaller amplifier which doesn’t have the extension of frequency extremes or power to make different parts of the recording come the to attention of one’s ears. Certainly, at very low listening levels differences it may not be noticeable but, it’s when you turn up the volume that changes things dramatically. I noticed such differences way back in 1974 when I first connected a Phase Linear PL-400 amplifier to my AR-3a’s. I was so desperate to attain a higher level of listening quality compared to my measly 60 watts per-channel Dynaco amplifier. With the bigger amp I was able to hear much more depth and detail in every recording I played. Now instruments were alive and came across with not only more depth but, more detail, a deeper and wider soundstage, transients had greater impact, expanse and bite, the lows were bigger and lower, and the mids and highs were more ‘there’ and with greater edge detail. Hall ‘echo’ was now a part of the music, note sustain rang on longer, micro-detail was now suddenly more present. This is a point I’ve tried to make some non-believers here on this site understand but was met with such stone-walling that I let sleeping dogs lie, moved on and felt confident that I was definitely experiencing more musical pleasure than they were. As the expression goes; “Heavy is the head that wears the crown”. Oh, here’s another; “You can lead a horse to water but, you can’t make him drink it.” Regarding the number of LST speakers floating around Britain, well there must be some there because here’s a little story I once conveyed on this site about 10 years ago. In 1990 I attended a stereo-expo as it were at ‘Singer-Sound’ in New York City. Also at the show, AR was apparently making their last-ditch effort at promoting their new line of a single amplifier, a pre-amp and additionally, a new speaker model. It’s also where I fell in love with large “Apogee’ speakers. http://www.reality-audio.com/apogeespeakers.html Walking through the different rooms containing set-ups from different manufacturers I bumped elbows with a tall distinguished gentleman who I started a conversation with. He couldn’t get his eyes off of my young vivacious, arm-piece wife and he had to be interrupted- by me! He was from England and briefly explained to me that he was a representative of AR in England. Feeling inadequate at best, I shyly explained to him that I was merely a vintage sort of person and that I owned very old AR-LST speakers and was powering them with a small Phase Linear PL-400, a 400 watt per-channel amp. I sheepishly knew, that I couldn’t approach the purchase of a single item from the array of top-shelf high priced gear or kit as you would say in Britain that was being promoted at this show. He proceeded to recount a story about how in 1972 or so he and his corporate associates had enjoyed the AR-LST’s immensely from time to time in one of their listening rooms. He went on to say the set-up was composed of two Phase Linear PL-700B’s and four AR-LST’s. Well, my mind began to take on a rush of thoughts about my equipment. He continued and told me that there wasn’t much else at the time that could approach the excellent sound quality he heard coming out of that system. My mind started to drift off and I thought I must go out and purchase two PL700’s immediately, hook-up my other set of LST’s in tandem and walla. My epiphany was abruptly halted by a slight dug from my then wife. The problem was I was newly married to a Euro-bombshell of a Olympic gymnast/dancer/model/… whatever, and I knew I couldn’t afford such an expense. Her, aka my young wife in all of her bombastic approach to life was costing me too much money as it was. That was then and in the last twenty years found myself purchasing three PL-700Series II amplifiers, a third set of LST’s, better interconnects, top-flight MC cartridges, correctly setting up my turntables and tonearms, and an intense vinyl record care regiment as best one could and now, I’m probably listening to the same if not much better set-up than that fellow from corporate AR was talking about. I’m sorry, what was your question? You want vintage ‘kit’, I got vintage gear, rite here. FM Foto taken from video clip.
  9. AR-2ax Project

    Those surrounds may be rubber. If so, no need to replace. I'd say listen and see if you like them. If so they can always be used in some "secondary" spot like a den, bedroom, workshop. Or give them to someone needing speakers. You can easily make grilles and that one corner bash could be filled with brown epoxy or Famowood (I don't recommend Plastic Wood). Kent
  10. A Nice set of LST's on CL in Albany

    Referring to the graphs above. Check the y axis on the LST. The reference for flat is not zero db. The flat setting on the LST apparently lowers the woofer output to give the impression of lower bass relative to the mid range. The roll off slope of the woofer is identical to the 3a graph. Maybe one of the other settings raises the bass and tweet output relative to the mids giving the impression of greater bass. Adams
  11. AR-2ax Project

    oh yeah, he said the grills are long gone.
  12. AR-2ax Project

    Trying to find information on these fishers is like trying to find information on my Onkyo Fusion AV series, one step above impossible. The only thing I found was a post in AudioKarma that the person stated that any of the ST series fishers were pretty low grade on the audio side. Anyway, they are ST-445s and here are a few pics. they have been in his garage for a while and are pretty dirty but the surrounds are very pliable and for what its is worth, tapping the woofer give a pleasant deep sound. Not sure if anyone here knows much about fishers but chime in if you do. (sorry, off topic)
  13. I think Mike's comment is correct. Hope this is helpful.
  14. AR-2ax Project

    Depends on where the speakers are placed. If on stands on the floor, than vertical would be better to get the mids and tweeters closer to ear level when sitting. If on a shelf, then most likely horizontal, with the tweeters to the outside for better wider sound stage. Woofer placement is not critical for low frequencies.
  15. AR-2ax Project

    Given the logo placement seen in the initial pics I posted on pg 1 of this thread, that makes sense. I am curious as to whether the 2ax's are best listened to on their side or standing upright with the tweeter and mid on top?
  16. AR Turntable thread

    XB owner here. Love mine. Great example of less being more. I had Marc Morin rework the tone arm with new bearings, wiring and a technics arm tube.
  17. A Nice set of LST's on CL in Albany

    Hi Frank from the UK. I think LSTs are quite rare over here but I have a pair. Interesting mention about the bass as the AR booklet from the time gives identical enclosure volumes for the LST and the 3a/Improved. The only difference I can see is in the crossover frequency. 525Hz for the LST. 575Hz for the 3a/Improved. Mike
  18. KLH Research Ten Series Model SCX^2

    Привет из Санкт-Петербурга, Россия. Мои колонки KLH, я попал в Финляндию в городе Куанкоски, я восстановил дела, я вставил новые подвески, и теперь я слушаю с приемником Marantz 2238 и вращающимся объектом Lenco L78.
  19. Classic KLH Model History

    Мои колонки KLH, я попал в Финляндию в городе Куанкоски, я восстановил дела, я вставил новые подвески, и теперь я слушаю с приемником Marantz 2238 и вращающимся объектом Lenco L78.
  20. KLH Model Ten

    My columns KLH, I have got in Finland in the city of Kusankoski, I have restored cases, I have pasted new suspensions and now I listen with a receiver of Marantz 2238 and a revolving object of Lenco L78.
  21. AR-2ax Project

    I remember them on the corners of the long/bottom side, as Kent has mentioned, with the "AR" emblem always occupying the same position in the Classic series.
  22. AR-2ax Project

    Pretty sure they were both on the bottom (long side when placed horizontally on a shelf). That's how the badges were placed on the AR-3 and looking at some old blurry ads I think the 2a was that way too. Tom would know for sure. OTOH what does it matter? Put it where you think it looks best (I know--heresy!)
  23. AR-2ax Project

    This is what I always do. That's why natural fiber cloth is best--poly won't shrink Kent
  24. AR-2ax Project

    Michael your 2ax speakers are really looking good. I never know where to place the "a" badge on my 2a's and early 2ax's. I have seen them placed on opposite corners on the long side and across the bottom side. I am really digging how you placed them in the diagonal corner. Was just wondering how AR placed them originally.
  25. AR-2ax Project

    I stapled it. Kept the staples pretty close. I thought I had heard something about misting and heating before. I might try that
  26. Large Advent Speakers - $100

    are these still available ?
  27. AR-2ax Project

    Pull it tighter where the rippling is and staple. Did you glue or staple the fabric? You can also use a water mister, mist the fabric and use the wifes hair drier, which will tighten it up a bit. You may need to do this several times.
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