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JBL 4408's - Pretty good!

Bauhausler said:
Thanks for the info. I'm listening to them now and they're very pleasant. I hope the woofer level will come up in sensitivity as the new surrounds loosen up.

One of the tweeters had a defect. A lead wire had corroded through where it was in contact with the paper disk of the diaphragm. I had to splice in a replacement lead. I used 26ga wire, which is much larger but is the smallest that I can comfortably handle. I did the soldering under a stereo microscope. I had only about 30/1000" of wire length to work with. It worked fine. This is not the first time I've had to fix a JBL lead wire that opened up. I wonder how many repairable tweeters have been tossed.
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I just picked up a pair of these speakers. Got them home and noticed one of the protective covers over the tweeter had been pushed in and was up against the tweeter which was also pushed in. Opened up the tweeter and to my dismay, they weren't hooked up. One of the terminals was completely removed from the speaker dangling on it's own. The other terminal is still attached to the speaker by a glob of soft rubberish (yellow) material. The terminal clip that was separated from the tweeter was attached to the speaker wire. I removed the glob from it but I didn't notice any wire coming out of the terminal where it would be attached to the speaker. Weird. I looked very closely and see no metal component or any wire where the speaker terminal fits into the plastic slot where the terminal rests. On the other terminal that is still attached (barely), I notice the glob of material goes back towards the casing of the speaker. is this material conductive and makes the connection. Don't see any wires anywhere. Looking for advice here. I don't know if the tweeter is still functioning properly as with one of the terminals not attached, I can't or don't know how to testn it. Would love to repair as a duplicate tweeter is in the $80 range.
Any assistance would be greatly appreciated - thanks
 
The wires feeding the diaphragm are almost microscopically thin. If they're broken they may be difficult to repair. I ruined a pair of 035Tis this weekend just by opening them; I broke one lead on each tweeter without realizing it in time; the faceplate was stuck and it pulled the adhesive and wires off upon removal (see my thread on this). I gave up on fixing them and bought a used pair on eBay.
 
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Zonker92 said:
The wires feeding the diaphragm are almost microscopically thin. If they're broken they may be difficult to repair. I ruined a pair of 035Tis this weekend just by opening them; I broke one lead on each tweeter without realizing it in time; the faceplate was stuck, and pulled the adhesive and wires off. I gave up on fixing them and bought a used pair on eBay.
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Guess I'll be looking for one or a pair - only ones I saw were copies at $80 each - ouch
Thanks for your prompt reply
 
Just sourced a pair of tweeters from flea bay. One of the speaker boxes was dropped and the cabinet was ruined. The guy decided to part them out. Would only sell as a pair but the price was so reasonable that it was not an issue to buy them both. They are being shipped as we speak. So now I've gone from needing one, to having an extra. If any AK member is looking for one, PM me and we can go from there.
 
What's the best way of getting into the crossover circuit? I've got a pair of 4408s and I'd like to replace the 4/5uF caps. Do I remove the tweeters, or the hf level adjustment panel? I've recovered the walnut veneer on these already, light sanding and applied some beeswax. These things look really cool.
 
mejkinra said:
What's the best way of getting into the crossover circuit? I've got a pair of 4408s and I'd like to replace the 4/5uF caps. Do I remove the tweeters, or the hf level adjustment panel? I've recovered the walnut veneer on these already, light sanding and applied some beeswax. These things look really cool.
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It's been a while since I did mine so I can't recall the specifics but you should be able to remove the crossover from the cabinet via the woofer opening. A recap really made mine come alive!
 
Excellent thanks, I'll have a go this weekend using some Solen caps. Got to be careful with the tweeter connections though, why did they make them so flimsy!?
 
Just picked up a pair of these, but will need new foam.
Does anybody know the best place to purchase the new foam surrounds? Thank you? ( by the way, the plastic is still over the XO bezel!).
 
barredowl said:
Very nice speakers easily in the top 5 out of 50 or so high quality pairs of speakers I have had.
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Hello music Lovers….just bought a super clean pair of these & new surrounds only have approx 5 hours on them….they seem Like good quality speakers….hooked up to a quality 1982 vintage Amplifier / i80WPC…..I also have a pair of L46 speakers to compare
 
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