Yamaha NS-1 vibrating - diyAudio
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Old 22nd January 2013, 08:44 PM   #1
ianp is offline ianp  United States
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Default Yamaha NS-1 vibrating

Just noticed that there is some vibration at certain frequencies/volumes on one of my Yamaha NS-1 speakers.

Looking for some advice on where to start looking for a fix, as I am otherwise very happy with them.



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These were not new to me and I'm not sure if someone has worked on them before.

The dial in the last image, I assume is to control treble via the crossover ?

Anything to be aware of before I break out the screwdriver and look inside ?

Thanks

ianp
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Old 22nd January 2013, 08:46 PM   #2
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Find out at which frequencies the vibration occurs, might help some.
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Old 22nd January 2013, 08:52 PM   #3
ianp is offline ianp  United States
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Quote:
Originally Posted by Rullknufs View Post
Find out at which frequencies the vibration occurs, might help some.
Thanks for the reply.

Is there a preferred way to do that - is there a CD/file that can be downloaded and played ?

Thanks

ianp
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Old 22nd January 2013, 10:00 PM   #4
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Where does the vibration occur?
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 22nd January 2013, 10:37 PM   #5
ianp is offline ianp  United States
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Quote:
Originally Posted by PeteMcK View Post
Where does the vibration occur?
Lower speaker and I just noticed that there looks to be a split in the diaphragm. Damn

Click the image to open in full size.

Can this be fixed or am I looking at replacing the driver and what would be a suitable replacement ?

ianp
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Old 22nd January 2013, 10:58 PM   #6
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re:" Damn " - I concur
if it is a split you could try gluing some fabric or heavy paper across the split (artists canvas works well),
obviously it would be more aesthetically acceptible to do this on the rear of the cone...
what is the cone material? some plastics are a pita to glue to
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 22nd January 2013, 11:07 PM   #7
ianp is offline ianp  United States
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It is some form of plastic.

Not too worried about aesthetics at this point as it's all about the sound
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Old 22nd January 2013, 11:16 PM   #8
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I see that you are not UK. Do you have a household glue that is "rubbery" in texture? We have one called Evostik. It is petroleum based and is ised for sticking vinyl tiles to floors and coverings on cabinets and other things. Just dab a bit of glue on the split. It is quite flexible and will last for some time,after it has dried.
There are companies out there that supply the outer polyethylene for this type of loud speaker, so look around the net for a supplier.

Last edited by JonSnell Electronic; 22nd January 2013 at 11:21 PM. Reason: Spelling
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Old 23rd January 2013, 04:07 AM   #9
ianp is offline ianp  United States
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Taking a look at loctite a couple of products look interesting

One is a flexible adhesive and the other not. Any thoughts as to which way to go ?
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Old 23rd January 2013, 08:45 AM   #10
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The Vynil adhesive is almost right but you are fixing polythene and that is not suitable.
In the UK we have a petroleum based solvent contact adhesive called Evostik. It is used for fixing carpets to floors and is very flexible when dry.
EVO STIK - IMPACT 32g Tube Stick Contact Adhesive Glue on eBay!

It is thixotropic, which means is dries and remains sticky to itself only.

Hope that helps.
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