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Pete B

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About Pete B

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    http://www.linkedin.com/in/petebasel
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    Male
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    Connecticut, NE USA
  • Interests
    Interest in Audio for over 30 years, got started early
    Electrical Engineer (see my web site link)

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  1. Pete B

    Capacitor Myths

    The above link to Ken Kantor's comments is dead but I found this one: http://www.classicspeakerpages.net/IP.Board/index.php?/topic/749-speaker-break-in-myth-or-fact/&tab=comments#comment-52320 Here is the text repeated in case that link goes dead also: Ken Kantor wrote: I don't want to sound like a curmudgeon, but one could make a career out of logically countering the spurious claims of audio manufacturers. From low end to high end, the bullshit factor is enormous. There just isn't enough time! I know this leaves the customer very bewildered, since everyone claims to be an expert and a golden ear. All I can say is that I have no reason NOT to suggest speaker break-in. In fact, many people have a "buyer's remorse" let-down when they first hook up their new speakers at home. So, it is very convenient for speaker companies to suggest a day or two of break-in. No harm, no cost, fewer returned speakers. But the perceived changes are generally psychological. If you have a fast connection, the following link may be amusing: http://www.aural.org/resume_01_files/articles/fetish/ One of these months, I will make PDF's of these old publications. Meanwhile, here's something I posted a few years ago: "Speakers are mechanical devices, and do have some degree of "memory". We play each one before it leaves the factory, but then who knows how long it sits unused, and at what temperature? Generally, a woofer will be in top shape after a minute or two of reasonable level play; a tweeter much sooner. But I have seen rare extreme cases, for example, a ferrofluid tweeter had been subjected to sub-zero temperatures and needed an hour of pretty hard drive to get in gear. 99% of the time, I believe your ears do much more adjusting than your speakers do after the first minute or two of play." A Google Groups search for "loudspeaker break-in" should also find some excellent comments by the late John Dunlavy.
  2. Thanks Rick nice to see and meet you at Frankenfest! Hope we have a better turnout in March.
  3. Pete B

    Small Advent Rebuild by Pete Basel

    I did a mod to these with modern tweeters and completely new crossovers: http://audiokarma.org/forums/index.php?threads/not-small-advents.837536/#post-11963954
  4. Frankenfest is an audio fest/swap meet that has been going on for many years originally hosted by Frank (RIP) in Clinton MA. It is organized by people on AudioKarma but we need more people so I am posting here also. I probably posted too late about the October 20th 2018 meet so I'm getting a very early start here for the March 23, 2019 Winter Frankenfest. These are the general rules, $5 fee for main person rest of the family is no charge: We have once again secured the American Legion Lodge in Sutton, MA for Saturday October 20th, 2018. We have the room for 12 noon until 5 PM though "organizers" can show up early to help "setup". The location is just off of route 146 south of the Mass Pike (I90) - so this should be a little bit closer for most of us versus Clinton. Dudley-Gendron American Legion 156 Boston Rd Sutton, MA 01590 Here's a link to a map: https://www.google.com/maps/place/A...24bd01d4435f98!8m2!3d42.1598864!4d-71.7401907 There will be an Audiokarma "Barter Town" thread listing gear that people plan to bring but you have to subscribe to have access to it. It is usually created a few months before the date. For sellers: As we saw last time there are tables available. We should bring extension cords and power strips. They have an ATM in the bar (could be dangerous, I know).
  5. Do you know how the switches were set for the AR-11 MKI input impedance?
  6. @RickB This was talked about on AK but they referred to the 12 thread per inch (tpi) but the original last I checked was 16 TPI so who knows, perhaps get a sample: https://dorrmillstore.com/index.php/site/products/category/foundation_cloth/17
  7. Thanks again, very interesting. I'll take some measurements with stock poly stuffing and fiberglass.
  8. I plan to attend and demo the following: I'll bring anything from my for sale ads if there is an interested party - message me here. NOT Small Advent: http://audiokarma.org/forums/index.php?threads/not-small-advents.837536/#post-11963954 NOT AR-11: http://audiokarma.org/forums/index.php?threads/not-ar-11-speaker.837616/#post-11972148 Will demo with the stereo Xindak power amp and matching preamp. Pete B.
  9. This started at AudioKarma many years ago and now meets in Sutton MA, I'm posting here in the hopes that more buyers will show up. If anyone is interested in anything that I have in the For Sale section here let me know and I'll try to bring it. Here are the rules: We're on for the 2018 FallFrankenFest! Entry fee for this event will be $5 per person (kids and spouses are free). We have once again secured the American Legion Lodge in Sutton, MA for Saturday October 20th, 2018. We have the room for 12 noon until 5 PM though "organizers" can show up early to help "setup". The location is just off of route 146 south of the Mass Pike (I90) - so this should be a little bit closer for most of us versus Clinton. Dudley-Gendron American Legion 156 Boston Rd Sutton, MA 01590 Here's a link to a map: https://www.google.com/maps/place/A...24bd01d4435f98!8m2!3d42.1598864!4d-71.7401907 Here's the Barter Town thread (visible to AK subscribers only): http://audiokarma.org/forums/index....0-20-18-fall-frankenfest-stuff-thread.832568/ For sellers: As we saw last time there are tables available. We should bring extension cords and power strips. They have an ATM in the bar (could be dangerous, I know).
  10. Yes, please stop by to say hi. I seem to recall seeing that people _have_ found a nice close replacement do you read on AudioKarma?
  11. Thanks again for all this info, I'll measure the system input impedance through the crossover to see if I can duplicate the AR-11 MKII curve. It is possible that the impedance of the woofer crossover network shifts the measured impedance peak lower in frequency. I found a higher Fc around 44 Hz with the factory stuffing but that was driving the woofer directly and given the tolerance on moving mass it is certainly in the ball park. I just noticed that the serial numbers have a C on the end and the single pole level switches confirm that these are the later design. Does anyone know if the stuffing quantity and/or type changed between the AR-11 MKI and II?
  12. These are CT pickup only or will drop off at U ship. For those who don't know me, I am: PB2 on DIYaudio Pete B on AudioKarma psound2004 on ebay with 100% positive rating Pete Basel on Parts Express Tech Talk. These Advent NLA 's in walnut are the cleanest pair that I've ever seen $499.I will try to bring them to Frankenfest Sept 20, 2018 Sutton MA if there is any serious interest, but if they do not fit in my car will meet up with a buyer in the very near future.Serial numbers #A473830 and #A473622Plug and play ready to go, bought from the original owner who said that they wereplaced in a room and never moved until sold to me. Shows 6-1980 build date inside. I went over them with Howard's Restore a Finish and Howard's Feed and Wax just tofreshen up the finish, there were no water marks or deep scratches. There are very minorscratches on the top and bottoms. I have a feeling that these had an easy life unlike many I've seen that were party speakers.The tweeters tested out perfectly, indicating that the ferro fluid is not burnt; they arenumbers 7 and 8 in this post with fundamental resonances well below 2 KHz:http://audiokarma.org/forums/index.php?threads/new-large-advent-tweeter-issues.824843/#post-11776773I carefully refoamed the woofers and they measure correctly as a result of using the correct foam.I recapped them with Dayton %1 poly film caps and with resistors to compensate for the original ESRas I discuss in this thread:http://audiokarma.org/forums/index.php?threads/advent-nla-input-impedance-warning.830276/This is a completely stock restoration - no modifications.I was going to keep these but have decided that I just have too many speakers.I am also the author of this web page: http://baselaudiolab.com/ADVENT_LA_XO.html
  13. Thanks for this info, I had no idea that those documents included weights and your confirmation of our findings.
  14. Repeated the above test using the 9.25" Pd value with the following results, Mms did increase from 63.3 to 65.2 which is not enough since this should actually be a bit higher than a scale measurement due to the acoustical air load on the cone. Should be measuring about 73 g adding a few for the air load. The effective Pd might be closer to 9.5". Here are the numbers: Note that it is significantly cooler tonight and the soft part compliance changes with temp which would explain the difference is Fs: Woofer PLB9-A2 with a DC resistance of 2.45 ohms: Rvc = 2.45 Fs = 15.7 Hz Qes = .231 Qms = 1.72 Qts = .204 Pd = 9.25" measured with a ruler Put in a 1.48 cu ft box: Vas = 14.6 ft^3 413 l Mms = 65.2 g slightly low probably due to the Pd being closer to 9.25 no = .672% Bl = 8.97 T-m Cms = 1.56 SPLref = 90.3 dB Fsc = 48.5 Hz Test box volume 41.9l = 1.48 cu ft acoustic mass ratio = .87
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