PSB problem part 2!

[Silviak]

So I posted awhile ago about one of my woofers having a slight rattle at certain frequencies. I took it into a local shop and they fixed it, just picked it up today and have been listening non-stop. They sound wonderful! PSB 50MKII

Anyhow, I was just looking at the woofer that was repaired and it appears the rubber surround has a slight bubble/deformation in one spot, and it did not before. From what they told me at the shop, they had to remove the surround as the adhesive was falling apart/failing, and something to do with the VC.

I inspected the woofer very carefully before taking them to the shop, but did not take any pictures. The woofer did NOT have any deformations before but does now. Should I go back to the speaker shop about this? Will it have any negative effects on the speaker in the long term?

 

[TLS Guy]

What did they do to repair the speaker? Did they try ans salvage the cone, if so and there was a voice coil problem, that was an improper repair, and will lead to problems.

Did you contact PSB about this and get their advice?

 

[AJinFLA]

So I posted awhile ago about one of my woofers having a slight rattle at certain frequencies. I took it into a local shop and they fixed it, just picked it up today and have been listening non-stop. They sound wonderful! PSB 50MKII
Anyhow, I was just looking at the woofer that was repaired and it appears the rubber surround has a slight bubble/deformation in one spot, and it did not before. From what they told me at the shop, they had to remove the surround as the adhesive was falling apart/failing, and something to do with the VC.

What most likely happened, to cause that rattle, was the speaker was overdriven - the voice coil former struck the back plate and deformed.
To fix it, the repair shop would remove the cone assembly by ungluing it from the surround (and spider attachment to frame), something like pictured...

....and re-rounded the bent former (center of pic). When they re-glued the cone assembly to the surround, they did a crappy job.

Will it have any negative effects on the speaker in the long term?

Maybe, maybe not. Unfortunately, there is only one way to tell.
However, if you drive your speakers hard enough to damage the VC former in the first place, you will probably exercise that glue joint on the suspension enough to find out sooner, rather than later .

cheers,

AJ

 

[TLS Guy]

What most likely happened, to cause that rattle, was the speaker was overdriven - the voice coil former struck the back plate and deformed.
To fix it, the repair shop would remove the cone assembly by ungluing it from the surround (and spider attachment to frame), something like pictured...

....and re-rounded the bent former (center of pic). When they re-glued the cone assembly to the surround, they did a crappy job.

Maybe, maybe not. Unfortunately, there is only one way to tell.
However, if you drive your speakers hard enough to damage the VC former in the first place, you will probably exercise that glue joint on the suspension enough to find out sooner, rather than later .

cheers,

AJ

If there was a VC problem, then you need a new cone and VC. I would regard a repair like described above improper, and you will have more trouble down the road.

 

[AJinFLA]

If there was a VC problem, then you need a new cone and VC.

But we don't know if it was a VC problem or a VC former problem, which I why I said "most likely". If it was a bent former, you would need no such thing. I suppose they might be able to glue a new cone in a bit better if it had the surround pre-attached, which it often does.

I would regard a repair like described above improper, and you will have more trouble down the road.

It certainly looks like s**t, but I can't guarantee trouble down the road the way that you can.
It certainly doesn't seem to be degrading the sound, as described by Silviak.

 

[highfigh]

So I posted awhile ago about one of my woofers having a slight rattle at certain frequencies. I took it into a local shop and they fixed it, just picked it up today and have been listening non-stop. They sound wonderful! PSB 50MKII

Anyhow, I was just looking at the woofer that was repaired and it appears the rubber surround has a slight bubble/deformation in one spot, and it did not before. From what they told me at the shop, they had to remove the surround as the adhesive was falling apart/failing, and something to do with the VC.

I inspected the woofer very carefully before taking them to the shop, but did not take any pictures. The woofer did NOT have any deformations before but does now. Should I go back to the speaker shop about this? Will it have any negative effects on the speaker in the long term?

If the cone is wavey, it may have been exposed to high temperatures. Did you have these in a place where they were exposed to direct sunlight or some other heat source? Was it wavey before you took it in? If not, this happened while they had it and it's not right.

 

[Silviak]

I'll have to call them and get a detailed description, the repair tag is very vague, and the repair tech wasn't there on Saturday when I picked it up. I purchased the speakers used, but the seller had them set up as surrounds and I was unable to test them accurately. The rattle issue was apparent as soon as I listened to them at home.

From what I recall about the repair, I think the shop said the VC needed to be realigned as it was off abit? All the repair tag says is "Solvent adhesive application" as they said they removed the surround. I'm really bad with terminology for woofers, it also sucks that the repair tech wasn't there when I picked it up. I guess I should have inspected it before leaving the shop too.

I will be contacting PSB tomorrow to get some further advice, and contact the shop as well?