Discussion in 'Home Cinema Speakers' started by shansnaps, May 8, 2016.
Collected this after having the mid base driver repaired and I've just unwrapped it to find this :-/
Yes. I wouldnt stop to think for a minute.
Suppose I'll get back on the phone to Richer Sounds then.
Yeah I don't think that's acceptable.
Forgive my ignorance, what am I supposed to be seeing?
There is a large blister or dent in the cone
Given that the drivers have a smooth front without a center dome, I suspect the Voice Coil is bonded to the cone. That bubble is probably an indication of poor bonding, and looks as if it might be near the voice coil. Which in turn means the voice coil could fail at some point in the future.
Also driver conse like this are frequently not make from a single layer of material, as you might see in a paper cone. Rather they are bonded in several layer, each layer having a certain characteristic. A bubble again indicated poor bonding of the sandwich.
Definitely contact the source of the driver, and complain.
I've been working away since I discovered the blister.. Came home today and it's farting like it was before I took it in for repair. Richer have been in touch though so that's something
I'm surprised you had to ask wether you should get back in touch with them.
I'm not sure how to interpret "Farting" but it sounds to me like I was right. The voice coil is coming or has come unbonded from the cone.
It is important that you contact both the Seller and the Manufacturer so that you start a paper trail regarding this problem.
By farting I ment the speaker sounds like it's blown and crackles above a certain volume.
This is the response I received from Richer earlier today
"Thanks for the details, I've spoken to our technical team and engineers about this, and it's their opinion that the speakers aren't actually damaged.
What you can see we refer to as the "spider", and it's the part that connects the voice coil of the driver to the cone. What you can see will in no way affect the performance of the speaker, it may even disappear with use.
If we replace the drivers again it's highly likely that the same thing will show up due to the age of the speaker and any available spares."
I also mentioned that the previous fault is present again (the crackling) and I've been instructed to take it back to the store for testing.
Part of me wishes I'd never delved into the world of AV, I spent what to me is a good amount of money on the setup I now have and I'd just like to be able to enjoy it.
Well, that's just crap. Yes, the "Spider" does connect the VOICE COIL to the Frame, but you can't see it unless you take the speaker out. And the Spider does NOT connect the Voice Coil to the CONE. Glue does that.
File:Loudspeaker-bass.png - Wikipedia, the free encyclopedia
The Yellow accordion-pleated material on top of the magnet is the "Spider".
It sounds to me like they are stone-walling you.
One question does come to mind - How Loud is Loud? You claim that the speaker 'crackles' when played loud, but how loud?
If you have an AV Receiver, and if you have run the SetUp program, then the volume control display should be calibrated. What number does it display when you hear the problem?
And if you haven't run the SetUp program, you definitely need to.
RS have a director that posts on here. If they keep being difficult, get in contact with him.
On the mordaunt short of this type (metal cones) there seems to be an issue with dents/bubbles in the surface of the cone........some may say that this could be caused by over driving them and its the heat being transferred from the voice coil. I once fried the driver in my old MS914 and it showed the same tell tale sign.
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