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Old 5th September 2012, 07:09 PM   #1
kosva is offline kosva  Greece
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Default Problem to 18W8531G00

Dear Friends
After eight years with my DIY TL loudspeakers I noticed that the surround
rubber of all my ScanSpeak 18W8531G00 woofers, have rifts on the gluing
point with the cone, and the two of them have a vertical cut.
So I send e-mail to the factory in Denmark, and their answer was after three
weeks :
"Thank you for your mail.
Please contact one of our distributors. You find them all listed on our
web site Scan-Speak They are all ready to help you."

I also asked them if this failure was normal but they didn't answer to this.
In the same room I am listening with other woofers too (SEAS, Dynaudio),
seven years older than REVELATORS, with no rubber problems.
After my contact with the local distributor in Greece he told me that
the woofers must be send to Denmark for cone and rubber replacement.
This is impossible, because the cost must be higher than to buy new ones.
So I believe that someone of the DIYers may have a solution to this problem.
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Last edited by kosva; 24th September 2012 at 10:57 AM.
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Old 5th September 2012, 11:14 PM   #2
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That is shocking. I've never seen that before and so far my drivers (15W4531) are OK.
I wonder if it was a bad production run or something specific to the 18W.

I don't know what option you have other than to send them back to the factory.
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Old 6th September 2012, 02:08 AM   #3
Bon is offline Bon  Australia
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That is really worrying. I have the identical drivers waiting to be installed in my latest speaker project.
3-way active, time aligned, constrained layer construction
As a back up option, I am considering the Audio Technology C-Quenze 18 H 52 17 06 SD which is 2.2 mm smaller in diameter i.e. 1.1 smaller in radius. I must disclose a preference for poly cones for mid-range over paper. I once bought identical Peerless HDS mid-range drivers except for differing cone materials, Nomex, glass fibre, aluminium and polypropylene. I ended up preferring the pp cone. I am hoping the Scanspeak will better my previous poly coned mid-range, but how long will it last, is the question?
I hope you eventually get some satisfactory response from Scanspeak.
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Old 6th September 2012, 02:22 AM   #4
Bon is offline Bon  Australia
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Quote:
Originally Posted by kosva View Post
... the surround rubber of all my ScanSpeak 18W8531G00 woofers, have rifts on the gluing point with the cone, and the two of them have a vertical cut.
These look to be stress fractures at glue joins. I can see pin-holes in the slit damping compound where the material has let go. I can't conceive that Scanspeak would not have tested the reliability of this construction, but stranger things have happened. I wonder if there are any other similar failures to report from diyAudio members?
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Old 6th September 2012, 02:41 AM   #5
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Kosva, do you play them really loud and what sort of environmental conditions are they subjected to?
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Old 6th September 2012, 09:02 AM   #6
kosva is offline kosva  Greece
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My listening room is small about 40 cu.meters so it's difficult to play them very loud. The enviromental conditions are the same for the other woofers too, which are driving by the same amplifiers.
The bottom woofers on ODINs are very old (from the first production line) and you can see the corrosion on the magnesium cones because the lack of the layer coating at the first line EXCELS.The surround rubbers of them are as the new ones.
The only difference is that the revelators were playing with an active xover for the first four years, and the woofers of each loudspeaker were driving by a monoblock diy Aleph 5.
But all this trouble was for my good. I dig up my old two way 16 litters enclosures, made with MDF and cement and a weight of 45 kg each.
I put on them the W18NX001 and my old Millenium tweeter, and after a lot of experimenting with many different passive xovers the result is greater than my previous and bigger speakers. The only bad is the lower sensitivity.

Last edited by kosva; 6th September 2012 at 09:04 AM.
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Old 6th September 2012, 12:03 PM   #7
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Just had a good look at my Cremonas and they are about that age, but absolutely no signs of any kind of fatigue.
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Old 8th September 2012, 03:34 AM   #8
rabbitz is offline rabbitz  Australia
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Mine have been in use since 2006 and no issues.

kosva.... have these been exposed to strong sunlight or placed close to a heater?
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Old 8th September 2012, 06:24 AM   #9
kosva is offline kosva  Greece
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(kosva.... have these been exposed to strong sunlight or placed close to a heater?)

There is not direct sunlight in the room. During the year the temperature is between 18 and 25 Celcius with no humidity. There is no heater in the roon because I am using the room only for listening music, from October to May, and the Alephs, or F5 are the only heaters.
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Old 20th September 2012, 01:54 PM   #10
palmas is offline palmas  Portugal
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Have a pair for a few years and no sign of problem.
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