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genek

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  • Birthday 07/31/1953

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  1. If all the varnish is like this, try a scraping knife first. It might just fall off with a lot less sanding.
  2. It would definitely be interesting to see what the response curve of an old AR-4x tweeter looks like. The published curves for classic era ARs are usually made up of individual driver curves superimposed on each other, rather than a single curve of the assembled speaker, so direct comparison between original and aged can readily be done.
  3. Your efforts would benefit considerably if you could measure the FR of your modded tweeter. It's harder to design a crossover if you don't know where your driver response rolloffs begin.
  4. The upload cap is cumulative across all forums you post to. I expect that there are some who will follow your project's progress in Mods and Tweaks because they're interested in trying it themselves and others who will just wait to see what results you post in the AR forum and whether you'll start selling them because they're only interested in drop-in replacements they can buy.
  5. Fyi, there's a cap on uploads. You'll fill up fast with crossposts. Better to use the share function to let people know there's a new post in another forum.
  6. The question posed by the OP was whether there's a modern tweeter that sounds like the original, whether it's a drop-in replacement or not. If you look at past discussions, you'll find more than a few about how to create adapter plates and crossover mods to make various modern drivers sound like hard-to-find originals. And if your project ends with you posting a response curve for a modded PRT that matches that of the original tweeter, there will probably be a lot of people congratulating you because they think it's a very good thing.
  7. The question is whether you are trying to improve the PRT by making it sound like the original AR tweeter or to make it sound "better" than the original. This is the key to determining whether to post here or in Mods and Tweaks.
  8. Response also depends on context. The brand name forums of this site are devoted to the history, care and restoration of original speakers and sound. A discussion of how to adapt a non-original driver to replicate the sound of a now unobtainable original part will usually generate some interest and positive reactions. Starting out with a mission to "improve" originals with redesigns because you think original was somehow lacking may get interest and positive reactions in Mods and Tweaks, but is unlikely to here. Imagine you modded a 1920s art deco cocktail bar to add a beer keg tap and a margarita machine. There would probably be people who would think it was a cool project, but you would be unlikely to find them in a forum devoted to art deco antiques.
  9. As far as I can recall, the people saying the PRT is a good replacement for AR-4s are usually the same people trying to sell them. The consensus here is that the only thing they really have going for them is that they fit in the cabinet. But the fact that nobody trying to sell these seems to have ever put a FR graph for them up may in itself be telling.
  10. Do the backs look like this, with the recess, magentic latch washer and handle scoopout?
  11. I would just look for someone who can cut new doors. My recollection is that the 10pi's doors were solid walnut, but the blackend edges of your doors look more like particle board. Are you sure they're the original doors?
  12. Can you shoot some closeups of the touchups that didn't go well? Maybe we can provide some suggestions.
  13. No, I can see how today's 6.5" woofers in a properly designed cabinet might outdo 50-year old 8" woofers. To compare to a larger 12" AR, you'd want something like this: https://usa.yamaha.com/products/audio_visual/speaker_systems/ns-5000/index.html
  14. Most new speakers that I see and hear give me the impression that they were designed to part of a multispeaker HT array. If you have enough of them spread around the room and a couple of subwoofers, you could probably reproduce the same low end and room-filling soundfield that a pair AR-9s would produce, and defintely a lot more high end, since that's what most consumers prefer today. You'd probably need a bunch of equalizers to get that AR rolloff if you wanted it, though. A pair of two-ways with 6" woofers may very well outperform the 8" woofers in AR-6s, but AR-9s? No way is a pair of two-ways with 6" woofers going to do it by themselves.
  15. Could just mean that the license was issued by "Teledyne Acoustic Research." As far as we know, AR never actually operated their own manufacturing facilities outside the US. They either licensed their IP to others or contracted others to manufacture for them.
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