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Multi-Way Conventional loudspeakers with crossovers

Damaged Scan speak Driver
Damaged Scan speak Driver
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Old 12th January 2020, 10:03 AM   #1
Ken98 is offline Ken98  Australia
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Default Damaged Scan speak Driver

Hi Fella's I have a pair of DIY speakers with Raal 70-10, Accuton C50 mids and Scanspeak 18wU/4747T00 illuminator woofers.

Have been enjoying the speakers for around 2ish years now but have noticed in the last day or 2 a buzzing/rattling noise come from one of the scanspeak drivers in one of the speakers.
The driver in question also makes a weird sort of scratching noise when I gently press on it.

I have found that by pressing firmly on the rubber surround on the right side of the driver it makes the buzzing/rattle go away, though it comes back sometimes requiring me to do this again.
Also when I gently press on the right side of the driver it self it doesn't make a weird noise.

Is this driver toast? and can it be fixed?
I live in Australia and these drivers are like $500aud to replace.

Woofer sound - Google Drive

The first recording is me playing a 70hz tone with the left speaker making the rattling/buzzing noise
The second is of me gently pushing against the driver and it making a weird noise, completely different to the other scan speak driver in the other speaker.
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Old 12th January 2020, 10:32 AM   #2
beardman is offline beardman  Denmark
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your driver is damaged ,,,i am not sure that Scanspeak repair driver,, on the Homepage you can find information to contact Scanspeak

Scan-Speak A/S – Scan-Speak A/S
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Old 12th January 2020, 10:35 AM   #3
Fenalaar is offline Fenalaar  Norway
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It might be suspension sag.

Remove the driver from the enclosure, noting which edge is up. Rotate the driver 180 degrees around its axis and reinstall it, so the edge facing up now faces down.

Johan-Kr
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Old 12th January 2020, 10:54 AM   #4
rabbitz is offline rabbitz  Australia
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Found a similar issue with some of the small Vifa NE drivers as the gap around the voice coil is small and the voice coil can rub. To correct, all I did was to push the cone all the way down a few times to help centre it.

Other than that, take the driver out, lay it flat (cone up) and run a 20-30Hz test tone through it for an hour. Use enough power to make the driver move about half the xmax. Can help centralise the voice coil and even out the spider and surround.
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Last edited by rabbitz; 12th January 2020 at 11:00 AM.
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Old 12th January 2020, 11:50 AM   #5
afa is offline afa  Australia
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Maybe a bit of debris has got into the voice coil gap? (this driver has an exposed voice coil former underneath the spider to help with ventilation and noise reduction)

Perhaps take the driver out and have a look

And as Fenalaar suggest it could also be cone sag

Or, maybe the end of the voice coil former has hit the back plate (due to excessive excursion) and it is now bent over and rubbing on the pole piece

Arthur
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Old 13th January 2020, 02:57 AM   #6
Ken98 is offline Ken98  Australia
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Thanks for the help guys.
I removed the driver, and had it positioned flat facing straight down, I then played some 40hz sine wave tone for around 2hours before flipping the driver 180 degrees and reinstalling it.

I no longer hear any buzzing noise and there is no longer and scarping noise when i manually depress the cone.

The speakers are in my small bedroom, it is way to small to do these speakers justice and my room gets pretty hot, especially with the how the weather in Australia has been lately. The speaker with the problematic driver is also next to a window and gets lots of sunlight, while the other speaker is opposite in the shade.
Combined with the hot weather I have been playing music a fair bit louder and for longer than I have in the past.

Last edited by Ken98; 13th January 2020 at 03:01 AM.
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Old 13th January 2020, 01:58 PM   #7
rabbitz is offline rabbitz  Australia
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Heat + sunlight is not a good combination for loudspeakers. Install some vertical blinds etc. That way you can still let light in without the direct sun.
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Old 13th January 2020, 02:20 PM   #8
beardman is offline beardman  Denmark
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This is real what diy is about,,,to learn new every day

i have not heard about the trick to rotate the noisy driver,,,have it something to do with high temperature in room,,or can it happen anywhere ?

all my noisy driver they were burn out ,,,and i have had some in my time

Thanks for learning us new tricks

Best Bjarne
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Old 14th January 2020, 09:00 PM   #9
Fenalaar is offline Fenalaar  Norway
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The driver rotation trick only works if the source of the buzzing is the voice coil former being slighly off center, because the suspension has sagged a little over the years.

It won’t work if the buzzing comes from a slightly overcooked voice coil ;D

Johan-Kr
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