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About Carlspeak

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  • Birthday 08/08/1943

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  1. Started my 3A restoration

    Those Mundorf resistors will work fine after the caps.
  2. Started my 3A restoration

    Those paralleled caps will have ESR values in milli-ohms. Suggest if you must add a resistor to duplicate a lytic type of ESR, then about 0.25 to 0.3 ohms would do the job.
  3. Started my 3A restoration

    Replace the 150, 50 uF wax block with good quality audio grade electrolytics. You won't be disapointed. Replace the wax/paper 6 uF cap with a good quality metalized film cap. Check out parts express. They have a good assortment of brands and prices to choose from. Solen and Dayton of 6.2 uF caps which I think are close enough. Or, you could parallel two 3.0 uF caps for an exact value.
  4. CSP download issues survey

    Thanks ra.ra. Please try a different .pdf file. I did today and didn't get that msg. Now, I'm wondering if the problem is unique to that file alone. However, we need to try downloading a few more to make any conclusions.
  5. CSP download issues survey

    I and at least one other CSP member have recently been unable to download a specific .pdf file. The CSP software returns a window that looks like this. Sorry, there is a problem The page you are trying to access is not available for your account. Error code: 2C171/1 Have any members who read this had a similar issue with downloading from CSP? Here is a link to the post that contains the problematic .pdf file.... You are welcome to try and download it or any other file and let me know what you find. Thanks in advance for your help.
  6. Sealing dust covers

    Some woofer designers use a screen dust cap to help cool the voice coil. Vented pole pieces are another way to vent air out thru the back. Another way is to use a felted dust cap to allow some air leakage in a controlled manner. Lastly, some use a perforated voice coil (small holes around the VC near the top). Those are intended (usually) to also vent the VC by instead allowing air to escape during the cone's in and out motion. The escaping air comes out of the VC underneath the spider which is porous and thus vents thru the spider. I can't say with any certainty that for the perforated VC type situation that the dust cap is always sealed. I do know that AR did use the perforated VC cooling method in their 12 inch woofers. Maybe a historian or two can shed some light on when that practice started. I suggest you shine a strong (LED) light down thru the dust cap while lifting the cone. Look for holes perforated around the voice coil near the top. If you are still working with your AR1 woofers, I'd be surprised if a woofer that vintage would have the VC perforated. Then again, that woofer may be a factory replacement (somewhat more modern). I'll stop now. Too much speculating...
  7. Hello Luigi and welcome to the classic speaker pages. There should be one or two hand drawn sketches of a Model A crossover I drew some years back during a major xo upgrade here in the Snell forum. Try doing an advanced search within the Snell forum using the search word crossover and my name as author "carlspeak". Over the years though, I have come to realize that like many other speaker manufacturers in that era, changes were made for a variety of reasons. So, your quest for the most exact information may be a moving target - unless, of course, you want info on the very earliest of models BEFORE changes were instituted.
  8. Advent OLA Re-foam - air leak?

    I think you're placing too much emphasis on the 'push the cone recovery test'. You've said it yourself. You can't tell a difference in their sound side by side. Just play them for a few weeks and you'll forget all about that 'silly little test'. :-)
  9. Snell EIII rear tweeter

    Send back the incorrect one, get your money back and buy the correct one you wanted from someone else. Atomic HIFI sells Snell drivers. They are expensive though.
  10. Advent OLA Re-foam - air leak?

    That's the surround most sellers offer. Personally, I use the foam sold for the metal frame Advent woofer. It has a narrow inner and outer lip..and, I believe a larger roll. I typically get Fs in the range of 18-20 hz w/o even any break in.
  11. Advent OLA Re-foam - air leak?

    I've dealt with a similar problem in the past. What I did to discover the source of the air leak was use one of those fire starter guns that emits a small flame at the end. I pushed on the cone and slowly (AND CAREFULLY!) moved the flame around everywhere there might be an air leak. If there is one the flame will find it.
  12. Are you trying to bi-wire or bi-amp? If there are two binding posts above two others, usually the top two are the plus and minus for the tweeter. The bottom 2 the plus and minus for the woofer.
  13. Ar4x surrounds

    To my best knowledge, cloth surrounds are no longer available for the 4x's. Foam will work just as good. I suggest you buy a kit with 2 foam surrounds of the type I recommended earlier, put one on the woofer with no surround and give a listen to your speakers for a couple of weeks. You may or may not notice any difference between the foam and cloth surround woofers. Worth a try.
  14. Ar4x surrounds

    Do you have foam or cloth surrounds?
  15. Ar4x surrounds

    Most of the on line sellers have them Ebay's Looneytunes, is a reliable seller. Simply Speakers and others. Just be sure to insist on the Boston Acoustics 8 inch filleted foams.