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Pete B

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About Pete B

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    Connecticut, NE USA
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    Interest in Audio for over 30 years, got started early
    Electrical Engineer (see my web site link)

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  1. @Jim Pearce I have a working pair for sale, do you still need them?
  2. Pete B

    AR MGC-1

    I have a vague memory of seeing it could have been in the library here or perhaps there was a patent?
  3. That makes sense to add the level controls. It is interesting how different these are from the AR-11 for example that has 10 uF in the tweeter circuit and a bigger inductor on the woofer. The midrange differences are expected since a different mid driver is used.
  4. Pete B

    AR MGC-1

    I'm not sure if I've ever seen the XO schematic. You might ask Ken Kantor, or some of the experts on here. Please post it if you find it.
  5. Thanks very much!ACOUSTIC SUSPENSION_Audio-1955-Jul.pdf I used pdfSam (free program) to chop out the specific article.
  6. It would be interesting to compare the 58s and 91 crossover schematics in this thread if you have them handy to post. I'm sure that they're around CSP somewhere. Nice job on the rebuild and XO swap by the way!
  7. Pete B

    AR MGC-1

    Anyone have the Magic Speaker .pdf that they could post here? The link to Ken's download is dead.
  8. I always have trouble finding this historic article covering the design behind the AR-1 woofer that started it all. I thought that there was a .pdf but have been unable to find it, here's a link to it in the library here on CSP: http://www.classicspeakerpages.net/library/acoustic_research/special_sections/additional_ar_documents/commercial_acoustic_suspens/commercial_acoustic_suspens.html A few more links with background: Some history at the AES: http://www.aes.org/aeshc/docs/record.../villchur.html Ed Villchur's patent covering his new invention, filed March 15, 1954: http://www.google.com/patents/US2775309 And another link here at CSP on a very fine AR-1 sample: http://www.classicspeakerpages.net/IP.Board/index.php?/topic/8511-historic-ar-1/page/2/
  9. Forgot to mention that I have an unrestored spare 3rd speaker that I will include for parts.
  10. My son restored these with my guidance years ago, thinking he could make money at it. His price was too high and they did not sell. He has better speakers so I've just used them in my home office since he did the work. The woofers have rubber edges that are still soft and should last many more years without any concern about foam. They are in excellent condition, restored with poly film caps and ESR compensation resistors, gold binding posts. They are excellent sounding speakers with low port tuning for tight deep bass and a smooth response through the midrange. They compare well to our Vandersteen 2Ci and PSB speakers. Ready to plug and play, Local pickup or will meet 50 miles from 06611 Connecticut. $140 cash or paypal. These have the Polk Silver coil tweeters as shown here: https://polksda.com/rta8t.shtml Drivers: 1 - 1" coil dome tweeter, 2 - 6.5" midrange Dimensions: 33.5"H x 9"W x 11.5"D Weight: 40 pounds each Specifications Impedance: 6 Ohms Recommended Power: 20 - 250 watts per channel Efficiency: 89.5dB Camera flash makes them look faded, they look much better in person:
  11. Further down in this thread around 9/2018 I finally get good Vas measurements of the AR 12" woofer: Your measurements look similar to mine.
  12. This should link to the factory specs in box: http://www.classicspeakerpages.net/IP.Board/index.php?/topic/10755-ar-10pi-woofer-problems/&tab=comments#comment-125861 The Q s are low because Fs is so low, and remember that most ARs use air core inductors with fairly high DCR so this will raise the effective Qts. Your Fs spec is quite close to the 18 Hz factory spec. Check for spider sag, this is important.
  13. Tom, nice meeting you today, here is Carl's thread on his Super Mod: Hard to believe it was 2007, seems like yesterday.
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