My SCAN SPEAK Tweeters don't work !!!! - diyAudio
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Old 30th December 2008, 10:50 PM   #1
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Default My SCAN SPEAK Tweeters don't work !!!!

Hi everybody, I'd like to post my problem with my SCAN-SPEAK tweeters D2904.

In fact, more than one year ago I bought these tweeters but they had the membrane a bit defective so I asked to SCAN SPEAK to repar them. After 3 months they substituted them and I saw the SPL and I thought it was very good. But now, I measured impedance curve of both speakers and I saw that one speaker have a perfect impedance but the impedance of the other speaker is full of garbage !!!



I repeated the measurements but it was the same result !!!

Perhaps there was a problem during substitution of the membrane but the real problem is that I can't use warranty now

What could I do ? Should I disassemble the tweeter ? How could I do ?

(please excuse my english)


HELP MEEEEEEEEEEEEEEEEEEEEEEEEEE!!!!!!!!!!!!!!!!!!!!!





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Old 30th December 2008, 11:27 PM   #2
Helmuth is offline Helmuth  Netherlands
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You could try to open the tweeter and try to line up to see if the voice coil is vibrating free.

May be there is some dirt between the voice coil and pole plate.
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Old 31st December 2008, 10:08 AM   #3
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I could try.

I thought: may the tweeter be damaged by measurements with MLS signal ? I think it could be strange because we are speaking about few seconds and two ore three measurements...

Is there a way to post a photo here ?

Where could I put my photos ?

Thanks
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Old 31st December 2008, 11:50 AM   #4
Helmuth is offline Helmuth  Netherlands
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With a test signal of 1w the speaker can't damage but with to low frequencies I don't know.
And the x-max the tweeter makes I guess.
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Old 31st December 2008, 11:58 AM   #5
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Consider we are speaking about few seconds of MLS signal !

I didn't never use a condenser because it could change phase response or not ?
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Old 31st December 2008, 12:05 PM   #6
AndrewT is offline AndrewT  Scotland
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you've blown it, it is not warranty.

Protect your tweeters by always feeding through a series capacitor to block DC and attenuate low frequencies.
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Old 31st December 2008, 12:18 PM   #7
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Only with few seconds of MLS signal ???

The membrane are perfect !!
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Old 31st December 2008, 12:20 PM   #8
AndrewT is offline AndrewT  Scotland
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I have never taken a tweeter apart, but I suspect the Voice Coil looks like the wire is little bigger than hair.
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Old 31st December 2008, 12:37 PM   #9
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I've a lot of old tweeters that were measured and played in every conditions but the impedance of them all are always perfect.

This tweeter never played without a condenser, only during two or three measurements.
It seems a little strange to have damaged a tweeter in this way.

Here are a photo of the impedance measured
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File Type: jpg d2904 non va.jpg (60.7 KB, 251 views)
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Old 31st December 2008, 12:39 PM   #10
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And here is the image of the other tweeter

Now I've measured the same tweeter (the "damaged" one) with a very low level and the impedance became better, but with two resonance points.
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File Type: jpg d2904 ok.jpg (57.4 KB, 238 views)
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