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Old 3rd September 2006, 04:35 AM   #1
wixy is offline wixy  Australia
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Default Speaker problem - sounds muffled

I just bought some 12" tannoy monitor golds. One speaker sounds fine, the other sounds muffled. Voices can be almost inaudible on the bad speaker. Can anyone tell me why this might be and what I would need to buy to repair it? I've posted some photos of the driver. The other speaker does not have that appearance of leaked glue, could that be the reason?

http://xs105.xs.to/xs105/06350/speaker2.jpg
http://xs105.xs.to/xs105/06350/speaker1.jpg
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Old 3rd September 2006, 09:01 AM   #2
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Well normally I doubt if it'd be the main cone, though that 'leaked glue' appearance doesn't fill me with a sense of delight. Could be the sealing around the suspension is letting go, and the driver needs rebuilding. Not good. Not an insurmountable problem either: humans built it, therefore it can be repaired, and there are several companies that specialise in just that.

I'd also suggest that you check the caps in the crossover. They're probably very tried now, and should be replaced. I'm not suggesting 'upgraded' here, though you can if you wish (might affect the value for those who prize originality), but simply replaced. While you're at it, check the rest of the XO for dead / dying components etc.
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Old 3rd September 2006, 09:53 AM   #3
dnsey is offline dnsey  United Kingdom
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The 'leaked glue' is probably where a new surround has been fitted (or possibly the existing one has been treated) and is very unlikely to have any bearing on the problem.
Tannoy DCs are not really 'full range' speakers in the usual sense - they have built-in tweeters, and it sounds as though yours may have failed.
Check the continuity of the HF voicecoil - if it's open circuit, you've found the problem. If it seems OK, feed it with low amplitude audio, and see how it sounds. If it's OK, the fault must be in the crossover (the switches often give trouble, if it's that type).
If the tweeter voicecoil is open circuit, you'll need a new HF diaphragm. They're available to buy and can be fitted by the owner, but if you have little experience in that sort of work, I'd advise you to leave it to a specialist rather than risk damaging such excellent and valuable speakers!
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Old 5th September 2006, 09:56 AM   #4
wixy is offline wixy  Australia
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Thanks for the advice guys. I decided to check if it was the crossover by swapping the drivers around. There was no problem at all with the sound from either driver, but then shortly after the problem did occur again with the same cabinet, leading me to believe it's the crossover at fault.

However next time i turned it on, there were no problems at all, and i've been listening for hours for the past few days still with no problems.

Happy now, thank god it wasnt the driver, these things cost a pretty penny!
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Old 5th September 2006, 02:52 PM   #5
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Could be a loose soldering connection, try resoldering the crossover components.
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Old 5th September 2006, 04:02 PM   #6
dnsey is offline dnsey  United Kingdom
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Does your crossover have rotary switches to tailor the response?
If so, they are notorious for developing intermittent contact. A go over with contact cleaner will greatly improve matters, but many enthusiasts permanently wire them out.
Check and clean the driver connecting plugs and sockets too - they commonly oxidise over time and will also benefit from some cleaning.
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Old 5th September 2006, 10:59 PM   #7
wixy is offline wixy  Australia
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Quote:
Originally posted by dnsey
Does your crossover have rotary switches to tailor the response?
If so, they are notorious for developing intermittent contact. A go over with contact cleaner will greatly improve matters, but many enthusiasts permanently wire them out.
Check and clean the driver connecting plugs and sockets too - they commonly oxidise over time and will also benefit from some cleaning.
Yep, the crossover has two rotary switches. Thanks for that advice, i'll give it a go.
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