Yamaha NS-1 vibrating

[ianp]

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.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

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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

 

[Rullknufs]

Find out at which frequencies the vibration occurs, might help some.

 

[ianp]

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

 

[PeteMcK]

Where does the vibration occur?

 

[ianp]

Where does the vibration occur?

Lower speaker and I just noticed that there looks to be a split in the diaphragm. Damn

An externally hosted image should be here but it was not working when we last tested it.

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

ianp

 

[PeteMcK]

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

 

[ianp]

It is some form of plastic.

Not too worried about aesthetics at this point as it's all about the sound

 

[JonSnell Electronic]

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.

 

[ianp]

Taking a look at loctite a couple of products look interesting

• Loctite Vinyl, Fabric & Plastic Flexible Adhesive from Loctite Adhesives
• Loctite Plastics Bonding System from Loctite Adhesives

One is a flexible adhesive and the other not. Any thoughts as to which way to go ?

 

[JonSnell Electronic]

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.

 

[fatmarley]

A mate used a bicycle puncture repair kit to fix the rubber surrounds of his speakers. He used a piece of condom (a new one) for the repair.
If it was me, i'd remove the driver and do it from the inside.

 

[JonSnell Electronic]

A perfect solution. Puncture repair outfit.

 

[ianp]

Genius. I believe I have some puncture repair kits in the garage. Hopefully not the ones with the pre-glued patches.

So just the adhesive or should I also look at using part of an unsoiled French letter or some other form of patch?

Thanks

Ianp

 

[mondogenerator]

rubber solution should work too like evostik or even perhaps copydex. A piece of linen, inner tube rubber or the like should work ok.

 

[JonSnell Electronic]

I generally use just the rubber solution. A patch will ressonate.

 

[ianp]

Thanks All.

I found a couple of tubes of finest rubber cement in the bicycle repair kits, so will effect a repair.

ianp

 

[ianp]

Some images of the interior.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

​

Even after removing the 3 screws holding in the lower speaker it remains well stuck into the enclosure. I decided to just apply the rubber cement to the outside of the speaker at this point. It should be possible to dab some glue on the split from the inside without removing the speaker, but it would be an ugly blob. That'll be the next step I guess.

ianp

 

[ianp]

Just to follow up. I used the rubber cement just on the outside of the diaphragm and this seems to have fixed the issue.

Thanks to all.

ianp