redpackman Posted June 23, 2014 Report Share Posted June 23, 2014 I've posted these pictures in a related thread on this site, but I'm still wondering. I've seen markings like this on other AR woofers. These are from an AR-6 I've just opened up, from 1972. What's with the tic-tac-toe markings on the speakers. I've been told they were for testing purposes, but how does that work? Link to comment Share on other sites More sharing options...
djcheung Posted June 23, 2014 Report Share Posted June 23, 2014 Hi there,I have the same question about the woofers on my AR6 as well.Best regards,David. Link to comment Share on other sites More sharing options...
ra.ra Posted June 23, 2014 Report Share Posted June 23, 2014 The woofers on my early pair of AR-6's (serial numbers ± 04000) in the attached pic do have the ribbed cones but do not have these markings. I believe this was a factory method to add a very small amount of mass (and/or stiffness?) to the cone. Others will chime in with a more technical rationale or historic timeline. You will find examples of both versions of ribbed cones, as well as AR-6's with smooth cones. Later model woofers usually had ceramic magnets rather than alnico. There were several versions of speaker marketed as the AR-6 model with at least four different crossover networks, but I think they were all designed to similar performance specs.I see that David in the UK has the slim profile Euro cabinet front edge, so clearly these tic-tac-toe markings were found on both sides of the Atlantic, but it is still possible that all of the drivers were manufactured here in Massachusetts.Long before the AR-6 arrived, many of the AR-4 woofers had a similar treatment on the cone. Link to comment Share on other sites More sharing options...
djcheung Posted June 29, 2014 Report Share Posted June 29, 2014 Hi all,My recent refoamed AR6 doesn't have the patterns on the woofers.Best regards,David. Link to comment Share on other sites More sharing options...
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