teknofossil Posted October 23, 2019 Report Share Posted October 23, 2019 Hello all. Does anyone know what the T/S specs on the AR 12" woofers should be? I have been going through my shop cleaning things up and found a pair of woofers that I had bought from a guy in NH years ago. I completely forgot I had these. Surrounds were replaced with what I am guessing were generic 15" woofer surrounds cut down. I ran one across my DATS and measured a free air of 19.5hz and a Qts of .25 (QMS= 2.399, Qes= .2817). Typically drivers intended for sealed enclosures is more like a Qts of.45-.5. I also found with the woofers a AR woofer surround kit from John McPeak at Msound which have the proper 5/8" width roll. Boy have my memories been dropping off the table.... Thoughts ? (no, not about my memory, the woofers) -T Quote Link to comment Share on other sites More sharing options...
genek Posted October 23, 2019 Report Share Posted October 23, 2019 I have this from Ken Kantor in my files. 303v3a.pdf Quote Link to comment Share on other sites More sharing options...
teknofossil Posted October 23, 2019 Author Report Share Posted October 23, 2019 Thank you. Obviously something is off with this woofer compared what KK's figures are. -Tom Quote Link to comment Share on other sites More sharing options...
Pete B Posted October 26, 2019 Report Share Posted October 26, 2019 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. Quote Link to comment Share on other sites More sharing options...
Pete B Posted October 26, 2019 Report Share Posted October 26, 2019 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. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.