Giorgio AR Posted April 19, 2019 Report Share Posted April 19, 2019 I have to give you an input on the weight and mass of the cone assembly, coil, spider, foam of a 12 "ceramic woofers. Pete b. And Luigifedele, weighed, measured the cone, coil etc. of the 12 "woofers. All is well, but the weight (and is missing in all the subsequent refoaming to the original) of the bead of thick glue around the inner ring of the foam, at the time, when I removed this material, the weight was a few grams, therefore in percentage on the high cone! Besides the fact that mechanically this "reinforcement" on the foam changes its response to oscillations. All refoamed woofers, I think they need to be weighted on the periphery of the cone? What do you think , I am attaching a photo where you can see very well this ring on the foam of a 12 "woofer, ring that I found on all the original untouched AR 4", 8 ", 10" and 12 "? I found the ring of "glue" of an 8 "woofer (I didn't find the 12" ring), it was photographed, above and below and measured the width, about 5 mm., 1/5 ", I don't have a scale to weigh the ring. Does the presence of this ring as well as suspension damping make sense as adding weight to the cone in the periphery and for stiffening the cone? The first photo shows the ring of a 12 "woofer with the arrow, the other three photos illustrate the 8" woofer ring Quote Link to comment Share on other sites More sharing options...
Tunedguy57 Posted April 24, 2019 Report Share Posted April 24, 2019 IHMO the presence of a glue ring is a normal consequence of assembling procedures, partially automatized. Thickness of the paper of cone from coil to edge normally decrease, and there is no practical need of an heavier edge. Instead, it's desiderable a lighter one, to prevent dynamic shock of the cone surface, and breaking-up phenomena. Quote Link to comment Share on other sites More sharing options...
Giorgio AR Posted April 24, 2019 Author Report Share Posted April 24, 2019 9 hours ago, Tunedguy57 said: IHMO the presence of a glue ring is a normal consequence of assembling procedures, partially automatized. Thickness of the paper of cone from coil to edge normally decrease, and there is no practical need of an heavier edge. Instead, it's desiderable a lighter one, to prevent dynamic shock of the cone surface, and breaking-up phenomena. Thank you for your technical answer, my curiosity was due to the fact that this ring on the surround I think appeared for the first time on the AR3a woofers with ceramic magnet and remembers the ring (of different material) placed on the external periphery of the woofer cone with Alnico previous magnet and cloth surround, I attach a photo with this ring highlighted Quote Link to comment Share on other sites More sharing options...
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