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  1. Hi all, My son and I are attempting to restore a set of AR-4x speakers as a way for both us to learn a bit more about speaker repair as a hobby and are looking for help with the project. My experience with speakers is limited to replacing the surrounds on a couple of sets and my knowledge of electronics is even more lmited. The reasons for restoring this particular set are easy enough: 1. We want to do the project together. 2. They seem like a pretty simple design as opposed to a set of Infinity Quantums or something like that. 3. While they're a great line of speakers, we don't have a lot i
  2. Hi, I'm looking to upgrade the tweeter and crossover on my 4X speakers. The pots are heavily damage as well. I'm hoping some of you have some recommendations on the following: Using the HiVi Q1R tweeter as done in the AR-2AX How should the crossover be updated? What pots should I use? Thanks, Harley
  3. An online auction closed tonight. The photos were crappy and left a lot to guess at. I watched three pair of speakers: AR-4, AR-4x and Heil ess AMT1. For each pair, there was a photo of the speaker fronts, grills on and then one photo from the back of one speaker showing the ID. I bid 125 on the 4s and 135 on the 4x speakers. There is a 15% premium to be paid on top of the winning bid so I valued the 4x pair at $150 and slightly less for the pair of 4. One guy dropped out on both pair of AR after outbidding me. Another guy came in before closing and won both pair. Th
  4. I am trying to restore a pair of AR-4x's, and one of them is producing no sound from the hi-range driver. I have turned the pot back and forth numerous times, but there is no sound at all. I removed the driver from the cabinet by melting the solder attachments. I'm new to using multimeters, but putting the probes on the tweeter leads seemed to measure no resistance. From what I have read, I think this means the voice coil is "open," and the driver must be replaced. ANy other ideas? And where would I get a replacement driver?
  5. Guest

    AR-4x's and room size

    I'm going to most likely be using a pair of 4x's in a fairly large, open room. (Yep, WAF rears it's ugly head!) Appx. dimensions will be 21x16x9. With hardwood floors, the room will be fairly hard acoustically. Placement of the 4x's will be along the long wall in an entertainment center, certainly not ideal. Power will be from a '70's Marantz receiver with an honest 40-45 wpc, and a "loudness" button. Program material will be mostly classic rock, but volume needs will be somewhat moderate. I just wondered if anyone else had tried 4x's in a larger room and what I might expect. I should add tha
  6. Hi there; I've downloaded a few photos of an ebay auction showing 3 - 1 /2" transistional tweeters. These appear to be an early AR experiment of the CTS 3 - 1/2" tweeter, prior to them having a completely fiberglas covered cone. I say early, as the pots have a black shaft and 4 bolt woofers. Any thoughts as to why and when? Ayone have any information about this modification? Would the early AR-1X and AR-2X's also have used the same unit's, temporarily as well ?
  7. Roy C. and I have been comparing notes on AR-4x details. It would appear that early AR-4x, say before about serial 290,xxx (mid-to-late 1969), used AR-#4 inductor (0.88 mH) and contained 17 oz fiberglass stuffing. The later AR-4x used AR-#5 inductor (1.2 mH) and 11 oz of fiberglass stuffing. It would appear that the AR-4x went through an itteration that, in principal, was the same as reported previously for the AR-3a in two separate posts (#5886 and #5322) where it was noted that the fiberglass stuffing was reduced from 28 oz to 20 oz and the woofer inductance was increased from 1.9 mH (AR-#7)
  8. Looking for a good replacement woofer for an abused AR-4x. I found a replacement on Ebay from Vintage-AR but it appears different from the original in several ways. For starters, the cone on the original is ribbed while the Vintage-AR replacement is smooth. The replacement also seems to have a ceramic magnet while I'm pretty sure the originals were Alnico. The surrounds also appear to be foam rather than cloth. And all that is fine with me as long as the replacement can match the sound of the original. In the the guitar amp world, I know that differences like these can greatly affect th
  9. My initial post was mistakenly appended to an AR-2ax thread, so at @JKent's suggestion, I have started anew. I purchased both my 3a's and 4x's at the same time in 1969 and have begun working on the 4x's for "practice" before tackling the 3a's. So here are some details: These are original purchase speakers, kept in ideal environmental conditions (but not used for a decade or so) and have the AR-4x name plates and serial numbers (see below) so I'm sure they are 4x's (after assuming they were 2ax's in my original comment, having not done my research OR reading the label on the back.) ? I
  10. I have a pair of AR-4x booshelf speakers that I'm quite happy with, but they just aren't able to reproduce the bottom octave or two of pipe organ music. So I'm looking for a subwoofer that would be a good match for them, and thought members of this list might have some suggestions. The room they are in is about 20 by 16 feet. Budget is an important part of the equation, and I also don't mind building a subwoofer if that's more cost effective. What's the story with the current line of AR subwoofers? I think they are the PR808, PR1010, and PR1212. They specifications look good, but the guy at th
  11. Hey everyone! First post here. I've had this pair of AR-4x's for probably about 5 years now but rarely listened to them. My old house just didn't have a great spot to setup a listening area so most of my music consumption took place at my computer with my JBL near field mixing monitors or in my car on the way to work. I recently moved and have a better place for listening so it's time to make these old 4x's better. I've done some reading through a bunch of restoration threads here and there's a ton of great info! But also a ton of confusing info. I think I might have two of the older 4x'
  12. I was browsing the 2016 LIS (loudspeaker industry sourcebook) that came in today's mail reading an article on ferrofluid written by insiders. Discussion went to the use of ferrofluid for coil centering ... "All the way back in the early 1970's, AR discovered that the spider could be removed and ferrofluid used for centering in single-point suspension designs (e.g., the the AR-4x cone tweeter). I've never had one of these apart but wasn't under the impression that the 4x tweeter used ferrofluid... anyone? Reference photo: Roger
  13. Mark: Is there sufficient user-generated and company information available on the lowly AR-4x to place in the Archives? Although this was not AR's most prestigeous product, it was its biggest seller. Don't know how many in total, but over a third of a million were sold between intro and end of 1970. I believe my final crossover diagram to be correct. Is there other information? History? photos? specifications? etc? thanks,
  14. A fellow New Jerseyan bought some reproduction speaker badges from me for his AR-4x's. Those speakers are special to me because they were my first (in 1969). They were also my first refurb project, with plenty of help from CSP members (John O'Hanlon in particular). I asked to see photos and noticed one non-AR tweet so I asked if he'd like me to work on them. These were in relatively good condition but had one Rat Shack tweeter. The owner bought a pair of what he thought were 4x tweets from an ebay seller in Canada but they turned out to be 4xa tweets (with front wires). Our options were; buy
  15. I came across the attached document recently. It looks very much like an original Acoustic Research response chart and I would like to confirm this. I can't remenber how or where I obtained it. I looked in the library and it's not there. Sadly, there's very little information on the 4x. There also is a similar tweeter response chart. I did some 4x thread searches here and over at AK and couldn't find it. Can anyone help confirm this is indeed an original AR document?
  16. As a big fan of AR's 8” speakers, I read with great interest Rob Holt's modification of a pair of AR-4xa's using drivers from an AR-18. That got the wheels turning in my head . . . . Over the last few years, I've accumulated three pairs of AR-4x's from various sources. It is a superb speaker, echoed by many here on classicspeakerpages. It's one shortcoming, however, is that certain roughness in the mid to upper midrange. Speaker Dave addressed this problem in his fascinating post in the Mods and Tweaks forum, where he did series of crossover modifications to a pair of 4x's. I decide
  17. I acquired a pair of speakers years ago from my parents. I used them for a long time and enjoyed them a lot. I recently replaced them as they did not fit the decor of my new house. I decided to do a bit of research on them before selling them and I did not realize they were antiques until I started looking on the net. They are AR-4x speakers in reasonable shape with original cloth grill and finish. I was wondering where the best place to sell them on the net would be where I could find collectors interested in these speakers... Any suggestions? (I live in Ottawa, Ontario, Canada) Thanks, Andre
  18. I've never really had much of an interest in the 4x's being a rather smallish speaker. Always went for the big boys....9, 3a's and LST's...etc. But after reading some lengthy threads here about how good these smallish speakers can be I decided to pick up a pair and give them a shot. I'll be using them at work so I don't need anything big and loud. Picked them up for $75.00 off Clist. One of the cabinets shouldn't be much of a problem fixing up but the other might be beyond repair or beyond good looking repair. You can tell it sat in water at some point. The seams have started to separa
  19. Some time ago we discussed differences in how fiberglass (FG) and polyester (PE) stuffing behaved in older speakers. Ken Kantor commented that he had not found an exact replacement for FG in older speakers for which FG was designed. It is itchy to handle and best done with gloves and mask (or outside on a nice 88-degree day like today!) As Ken commented, speakers can achieve the same performance with polyester, if other parameters are changed. The issue faced by those who restore old AR speakers is that there appears to be no direct replacement for fiberglass that will produce the desired lo
  20. This orphan came in today so I recapped it and sealed the massive air leaks around the substitute tweeter. Sounds great paired with the Elwyn 4x although it is a lot brighter/forward in the midrange which is easily adjusted with the pot. Hmmm, guess I'll have to stack it with the orphan AR-338 and see how it does. Serial number 45K in unfinished pine and OSB baffle and back. The back had swelled quite a bit from moisture but the seams are pretty much intact. The cab may actually cleanup fairly well with some effort. Looks like the tweeter may be from KLH. The only marking is M-12 with a late 6
  21. Guest

    AR-4x question

    Hi, I'm new on this forum. I have my AR-2ax pair I bought new in 1974. I have recently acquired pairs of AR-4x and AR-3a. In resealing the woofers on my AR-4s, I noticed that I could see through the surrounds and they appear to be fabric. I didn't know that the 4s had fabric surrounds? Since I can see through them, I'm assuming that air will move through them handily. I further assume that I can remedy this with PERMATEX HIGH TACK gasket sealant mentioned in the AR-3a restoration manual? Did the 4x come with cloth surrounds? Can I safely use the gasket sealant as described in the AR-3a res
  22. A friend just picked a pair of AR-4x speakers. One of them is in great shape- woofer, tweeter both work. Cabinet and grill looks really good. The other speaker's tweeter doesn't work. I'm hoping new cap and l-pad will fix it. The cabinet has some separation in the top corners. Is this an issue? Can I just put filler in the opening? Is there another way to fix them, or should I just leave them alone? The particle board looks good, so I don't think it is water damage. -Joel
  23. Hi As suggested I am reposting my original inquiry..Where I have already received encouraging feedback. .... have inherited a pair of AR-4x that have been in the family for years and I am interested in rebuilding. I am a total speaker neophyte. They sound a bit flat, that is, not much sparkle or depth and when the volume is turned way up on my 110 Watt/channel receiver they do distort. Is it a given that I must change the tweeter and woofer? Attaching photos. Both speakers woofer and tweeter seems to be in the same condition. Thanks for any advice. ... I
  24. I have a blown AR-4x tweeter here that measures open circuit and I'm going to document at least some of the physical characteristics here. This was donated by mrBruce4, thanks Bruce! I was hoping that perhaps it had a buzz problem so that I could measure the T&S parameters at a low level before the buzz but it is open circuit so this is not possible. This treated paper cone tweeter is essentially a scale down of an acoustic suspension woofer, where the frame is sealed in back forming a chamber that is filled with white fiberglass. The fiberglass actually touches the paper cone with some
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