Planar Speaker Asylum

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Planar Speaker Asylum

One tweeter out on IIIA - what are my next steps?

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I recently moved my speakers and set them up. Noticed that the left one was sounding different. Checked the fuse on the tweeter and it was blow. Replaced it and I still have no sound from the tweeter. I assume that since the fuse was blown - there is nothing to hang on the move - I must have torched it myself. Is there anything else I should check - figured I would look at impedance across the terminals. Any other suggestions?

Follow Ups:

RE: One tweeter out on IIIA - what are my next steps? - atkin11j@yahoo.com 06:59:06 09/23/10 (0)
Well - that was pretty simple detective work. You can see in the pic that the ribbon tweeter is smoked. I am assuming these are original to the speakers - so I guess 25 years out of a set of tweeters is not bad. Will do both of them.

Thanks for the tips and help.

Derek.-
RE: One tweeter out on IIIA - what are my next steps? - neolith 17:42:13 09/22/10 (0)
Let's not jump to conclusions since you're about to spend $200 to replace the ribbons.
First check the new fuse with a ohmmeter or at least try a second fuse. It's unlikely that the new fuse is bad but $200 is $200.
Open up the panel and check the connections at the fuse block - maybe there is a bad connection, including one that was never soldered. We have all heard stories of less than ideal QC at Magnepan.
Do the same at the connectors of the ribbon (remove the little Magnepan stickers at the top and bottom). When I replaced the wires on my IIIa's, I screwed up the soldering (ok, I'm not perfect)and there was a cold joint.
Besides visually inspecting the tweeter try attaching a ohmmeter to the top and bottom of the tweeter to see that it is not open (infinite resistance). Unfortunately some have found that the tweeter is a very good fuse protector.
�

I plan to procrastinate my demise for as long as possible. In the meantime, I practice by putting off all the little stuff.

Edits: 09/22/10
RE: One tweeter out on IIIA - what are my next steps? - gregmacknass2@netzero.com 16:36:02 09/22/10 (0)
I would suggest a visual inspection of the tweeter. Take a flashlight and shine it through the screen. If there is a break in the tweeter it should be fairly obvious (though you might have to really look to see it). When my 3a's blew their ribbons they tore in several places at once. Needless to say it wasn't hard to see what the problem was. The cost of replacing the tweeters is pretty good incentive to always put the protective strips on whenever moving them. And if it is blown I would suggest replacing both sides, to maintain balance and to save on shipping (as the other one is probably not far behind that one).
-Greg

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