Members OMNIFEX Posted July 19, 2003 Members Share Posted July 19, 2003 I'm wondering when they rate raw woofers, using theThermal Rating, are they tested in a box, or, just havethe raw driver sitting on a work bench. Link to comment Share on other sites More sharing options...
Members agedhorse Posted July 19, 2003 Members Share Posted July 19, 2003 Thermal rating can be done many ways, but generally in an infinate baffle/box, and bandwidth limited pink noise with a specified crest factor. I believe there's an AES spec for this. Also, I think 70 degrees ambient is specified. Other ways are with themal modeling, and with just pink noise in the intended application box. The thermal power ratings tend to be more consistent than the mechanical power ratings which depend on so much more dynamics control, box application, filtering, peak to average ratio, time constants & duty cycle, etc. It's really a crap-shoot, and many manufacturers continue to over-rate their products since they have effectively gotten away with it without too many warranty claims. Link to comment Share on other sites More sharing options...
Members thunderpaw Posted July 19, 2003 Members Share Posted July 19, 2003 What's the best adhesive for re-gluing spiders and surrounds? Link to comment Share on other sites More sharing options...
Members agedhorse Posted July 20, 2003 Members Share Posted July 20, 2003 I use a rubberized latex glue for both spider to frame and surround to frame except in very high humidity areas (theme parks where speakers are essentially wet all the time. Epoxy for voice coil bobbin to cone neck under all circumstances, no exceptions even for vintage and "low power" parts. This gives me the best of all worlds. Link to comment Share on other sites More sharing options...
Members thunderpaw Posted July 20, 2003 Members Share Posted July 20, 2003 Thanks, Andy. I had tried "Goop" years ago...what a mess! Eventually, it hardened. I have used Weldbond of late as it never really hardens and has a good bond. What is the brand of rubberized latex that you use? Is it a special order, or commonly available? Kim Link to comment Share on other sites More sharing options...
Members agedhorse Posted July 20, 2003 Members Share Posted July 20, 2003 It's a specialized product that looks like white glue but dries clear and rubbery. I buy it from my wholesaler in pretty big quantities... enough to do maybe 100 speakers or so! There may be aftermarker sources for more reasonable quantities but I am not aware of any. Link to comment Share on other sites More sharing options...
Members OMNIFEX Posted July 20, 2003 Author Members Share Posted July 20, 2003 Thanks Agedhorse. So, do you think it would be asking too much for them to offer the enclosure size when they conductedthe thermal test? I imagine you would get a different response if it was in a 2 liter box, than a 10 liter box. Or would it, since they can't really run a Thermaltest under 100 hertz, without XMAX playing a good factor here? I know they recomend enclosure size from A - Z,is this what they ran their tests, to come to their conclusion? Link to comment Share on other sites More sharing options...
Members agedhorse Posted July 20, 2003 Members Share Posted July 20, 2003 Enclosure volume really doesn't make much difference. Also, Xmax is a much more important spec IMO. I rarely see a thermal problem on a LF driver anymore. Link to comment Share on other sites More sharing options...
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