djk Posted December 16, 2006 Share Posted December 16, 2006 "I don't think aluminum will get it Duke -- won't go low enough. " The geometry of the Atlas PD5V is a phenolic copy of the aluminum WE555 which was rated to 100hz at 5W. The way they are built will go much lower than the JBL diamond type surround. Quote Link to comment Share on other sites More sharing options...
djk Posted December 16, 2006 Share Posted December 16, 2006 Another example: http://www.audioheritage.org/vbulletin/attachment.php?s=a7cc1787619e607bc126629b835ff6d4&attachmentid=6466&stc=1&d=1112731205 WE-555s on 100hz horns: http://www.audioheritage.org/images/misc/we/wide-range.jpg WE-713 wide range (500hz~15Khz) driver used on the original K5 http://www.audioanthology.com/images/713back%20copia.jpg Quote Link to comment Share on other sites More sharing options...
mike stehr Posted December 16, 2006 Share Posted December 16, 2006 Old skool.... http://www.audioanthology.com/audio3.htm Quote Link to comment Share on other sites More sharing options...
homemadeheresy Posted December 16, 2006 Share Posted December 16, 2006 I need a pair of those Western Electric horns [] Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 16, 2006 Share Posted December 16, 2006 I need a pair of those Western Electric horns [] easy ... just go to the bank for ....$$$$$$$$$$$$$$$$$$$$$ Quote Link to comment Share on other sites More sharing options...
oscarsear Posted December 16, 2006 Share Posted December 16, 2006 I too run phenolics in my JBL 2482s. I have even more questions. What is being assessed when the resistance is measured across the input leads? A what rate and how much do these vintage drivers lose their magnetism? I know they can be completely refurbished but determining when that is worthwhile would be nice to understand. I have seen new old stock phenolics on e-bay for mine that seem to sell for around $80.00. But if phenolics degrade with time is NOS the way to go? New 2482 phenolics run about $300.00 ea. I have written JBL trying to get a service manual for these but got nothing useable. Anybody have a service manual for the JBL2482 driver I can get a copy of? Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 16, 2006 Share Posted December 16, 2006 What is being assessed when the resistance is measured across the input leads? strictly DCR..Direct Current Resistance doesn't even mean the drivers useable ..... A what rate and how much do these vintage drivers lose their magnetism? I wouldn't be concerened with that, unless you have dropped the driver Quote Link to comment Share on other sites More sharing options...
awsjr Posted December 18, 2006 Share Posted December 18, 2006 Dean...$500...no way....these will work in the 2470... Jammin Jersey has (1) JBL 16R 2461 16ohm phenolic diaphragm for $100 Quote Link to comment Share on other sites More sharing options...
Deang Posted December 18, 2006 Author Share Posted December 18, 2006 Sure, but the same problem: Don't know anything about possible degradation of performance due to age and abuse. Mine sound good, and measuring with an RTA shows them both to be about what one would expect to see out of them. I'm a bit prone to audionervosa though, so I decided to ask. Dennis' plot kills me. I was under the impression that of the two diaphragm types (materials) available for these drivers -- aluminum wouldn't go as low as phenolic. Quote Link to comment Share on other sites More sharing options...
Deang Posted December 18, 2006 Author Share Posted December 18, 2006 I wouldn't be concerened with that, unless you have dropped the driver Storing the drivers with the magnets next to either is supposed to be unhealthy too. Quote Link to comment Share on other sites More sharing options...
CONVERGENCE Posted December 18, 2006 Share Posted December 18, 2006 So, how long do these things last before performance is degraded. We'll assume the driver hasn't been abused. AES OR RMS ? jOKE ha ha. There are really only two diaphragms to consider aluminum and Pascalite. Some say the Aluminum has slightly better highs. At best it's marginal. The Pascalite has a different alloy and a carbon fiber former, allowing it to handle more power. The aluminum should be considered for home stereo only. They blow too easily for live sound use I'd have to ask what horns you are using? I HAVE used the Aluminums down to 300, but they certainly won't handle much power. The problem is the excursion. The diaphragm has to move so far to produce a longer (lower frequency) wave. So if you crank them, they will blow. If i wanted to go to 300 LOUD I would use Phenolics. ...................... Quote Link to comment Share on other sites More sharing options...
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