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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: Tweeter works with no connection in the attenuator socket posted by neolith on August 25, 2010 at 08:23:33:
Hi Neo,
Well looked behind the panel, - you were dead right, - found a big 1 Ohm 10W wirewound resistor wired in parallel with the terminals of the tweeter attenuation socket! So that partly exaplains why these speakers have a duller treble than I remember a 3 series having. As for the tweeter imbalance, - am not sure yet if its due to one actual tweeter being bad, - not tested them in isolation yet with my NAD power amp, but I suppose its possible there is a bad solder joint there or one of the resistors has a higher resistance than the other (guess this is not that likely though, - they have 3% tolereance). In any case, I am no expert but I think someones gone over a lot of the solder joints behind the panel, - there are brown/orangely marks on the solder, - I think this is signs of the joints being overheated. So I will have to go over them, - do you think I should remove all the old solder and reapply new, or just heat up the current joints and put in a bit of fresh solder?
The fuse sockets (both of them) are not bypassed.
The question is, why did someone put these resistors in? Was it to attenuate the tweeters from a personal preference point of view or it is becuase these speakers are fitted with the earlier 2.3 ohm ribbon which require a 1 ohm resistor in series (the crossover does not have it on this newer speaker obviously)? I forgot to check but it seems my easiest why to check is to measure the gap on the back of the tweeter (according to what Andy said), - the old tweeter is about 1/2 and inch and the newer on has a gap of about 3/8 inch. Also the older is 60.6 inches long and the newer type is 60 inches but thats obviously hard to measure! But I think measuring (if I can tell) is easier (but perhpas less conclusive) to finding out which tweeter they have than measuring the DC resistance of them.
So some progress made, - will report how I get on!
Cheers,
Colin
So I am hoping removiing the resistors and
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Follow Ups
- Part of the tweeter mystery solved! - Davy 03:07:14 08/26/10 (3)
- On the road to recovery - neolith 06:58:32 08/26/10 (2)
- Making further progress! - Davy 17:09:04 08/26/10 (0)
- RE: On the road to recovery - Davy 08:04:41 08/26/10 (0)
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