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KEF Q50 Tweeter(SP1352) has gone to "KEF Heaven".
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Shadeyman
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Joined: 23 Jan 2016
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Location: Wolverhampton

PostPosted: Sun Jan 24, 2016 3:00 pm    Post subject: KEF Q50 Tweeter(SP1352) has gone to "KEF Heaven". Reply with quote

I guess the title of this thread is a little miss leading as the tweeter didn't chose to go to "KEF Heaven", it was forcibly sent there by my daughter. Evil or Very Mad

After 2 weeks away with the wife I returned home to find my "beautiful Q50's" broken, my daughter had a few friends around and the volume was turned way to high for my ageing speakers. I've tried in vain to find a replacement, even get it repaired, no joy. Crying or Very sad

Please help me find a replacement/repair.
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proffski
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Joined: 22 Aug 2003
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Location: Tewkesbury UK

PostPosted: Sun Jan 24, 2016 4:16 pm    Post subject: Re: KEF Q50 Tweeter(SP1352) has gone to "KEF Heaven& Reply with quote

That is tragic, there is nothing worse than a premature demise of such an excellent transducer. I'd be concerned about the wellbeing of the remaining unit as well as components on the PCB, worth checking...
There is much confusing erroneous information out there regarding your sad plight. Best I could find in a hurry were these links, I have seen these on ePrey but please tread with care!

http://www.diyaudio.com/forums/multi-way/225843-kef-nt19-tweeters.html

http://www.hifiwigwam.com/showthread.php?76294-WTD-Kef-NT19-tweeter

http://www.avforums.co.za/index.php?topic=51275.0
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Shadeyman
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PostPosted: Sun Jan 24, 2016 6:02 pm    Post subject: Reply with quote

Thanks proffski.

It would appear that "soundadv" on the South African forum has 2 of them. I've just registered, awaiting activation. Maybe he'll allow me to purchase one of them.
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proffski
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PostPosted: Sun Jan 24, 2016 6:31 pm    Post subject: Reply with quote

Good luck, be careful with your money...
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I contend that for a nation to try to tax itself into prosperity is like a
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-Winston Churchill
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Shadeyman
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PostPosted: Sun Jan 24, 2016 6:44 pm    Post subject: Reply with quote

Its worth the risk, love my old Q50's. Fingers crossed .. Smile
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proffski
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PostPosted: Sun Jan 24, 2016 6:46 pm    Post subject: Reply with quote

Shadeyman wrote:
Its worth the risk, love my old Q50's. Fingers crossed .. Smile

Please keep us informed, I agree about the loudspeakers!
Have you removed and examined the dead unit?
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I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
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Shadeyman
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PostPosted: Sun Jan 24, 2016 7:04 pm    Post subject: Reply with quote

I removed it and asked an electrician friend to test it for me, he said it had burnt out. So I pulled it apart to see if we could repair it. Unfortunately that was beyond our capabilities. Sad



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proffski
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PostPosted: Sun Jan 24, 2016 7:09 pm    Post subject: Reply with quote

Well and truly scorched. Looks like your amplifier was not only driven to clipping but I'd hate to have listened to the source material! Confused
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I contend that for a nation to try to tax itself into prosperity is like a
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-Winston Churchill
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Shadeyman
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PostPosted: Sun Jan 24, 2016 7:19 pm    Post subject: Reply with quote

My daughter said they were using my Spotify account to stream music. My account seemed to have played a lot of "Chase & Status" about that time. Evil or Very Mad

I'm worried about the other tweeter and cross overs. Is it possible they're damaged too?
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proffski
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PostPosted: Sun Jan 24, 2016 7:24 pm    Post subject: Reply with quote

Shadeyman wrote:
My daughter said they were using my Spotify account to stream music. My account seemed to have played a lot of "Chase & Status" about that time. Evil or Very Mad

I'm worried about the other tweeter and cross overs. Is it possible they're damaged too?


I'd measure the DC resistance of the other tweeter, but if it sounds OK then fingers crossed.
However, I would carefully remove the crossovers and check for scorched PCB around resistors and bulging capacitors.
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I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
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Shadeyman
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PostPosted: Sun Jan 24, 2016 7:29 pm    Post subject: Reply with quote

I've no idea what "scorched PCB around resistors and bulging capacitors" are so I'll ask my electrician friend to help again.

The other speaker sounds fine but the one with a faulty tweeter sounds terrible. Crying or Very sad
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proffski
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PostPosted: Sun Jan 24, 2016 7:46 pm    Post subject: Reply with quote

This is a picture taken by a member of another KEF loudspeaker, so do not panic!
The capacitors are either those black things and or blue...
I've seen them exploded on the PCB in the past, the resistors just char the circuit board, seldom change value if wire wound.

Link: http://www.hifiloudspeakers.info/speakertalk/viewtopic.php?t=1585

Just scroll down, the items are marked HOT
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I contend that for a nation to try to tax itself into prosperity is like a
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-Winston Churchill


Last edited by proffski on Sun Jan 24, 2016 7:53 pm; edited 1 time in total
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Shadeyman
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PostPosted: Sun Jan 24, 2016 7:53 pm    Post subject: Reply with quote

I tried copy and pasting that link, it doesn't work?

Edit.
It does now, sorry ..


Last edited by Shadeyman on Sun Jan 24, 2016 7:56 pm; edited 1 time in total
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proffski
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PostPosted: Sun Jan 24, 2016 7:54 pm    Post subject: Reply with quote

Shadeyman wrote:
I tried copy and pasting that link, it doesn't work?


Sorry, that was my fault, now corrected, just double clicking on it should do the trick!
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I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
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Shadeyman
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Joined: 23 Jan 2016
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Location: Wolverhampton

PostPosted: Sun Jan 24, 2016 8:01 pm    Post subject: Reply with quote

Whoever the other member is, like myself he has a Photobucket account.

Is this the picture your referring to?

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