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Cannot figure this out. Speaker question.

#22
My first guess would be that the mystery orb is a stray component from the factory that stuck itself to a speaker somewhere along the build process.

Unless it's a bug, but a cab might not be the best place to hide a listening device.
 
#23
Thanks for posting the pictures Dr. Jim. As to the magnetic properties of the disc; lifted a 10lb. barbell plate with it.

I've had the Laney Nx810 cab now since Dec.2010. My first impression was that it was a great 8x10 cab. Sounded as good as the Ampeg and 50lbs. lighter. It seems to have lost some efficiency since the incident with the magnetic disc. I have to turn it up louder and I'm not sure it does sound the same as before. It doesn't seem to sound as full and clear. I've been thinking about ordering a replacement speaker for the day that I take each speaker out individually and test them. The thought of doing that is not appealing to me. All the metal screws, the paper surrounds of the speakers. One slip of the screwdriver and I won't have to wonder if a speaker needs to be replaced.
 
#24
Glad to help.

Am I to understand the disc was found on the inside surface of the speaker grill?
What is the trace stuff stuck to the glue? It might point to when the disc was attached.
Send those links to Laney. Meanwhile, what if there is nothing wrong? Is it possible?
 
#25
One Drop said:
My first guess would be that the mystery orb is a stray component from the factory that stuck itself to a speaker somewhere along the build process. .
Click to expand...
+1. Typical driver magnets aren't discs, they're rings. Not that a disc magnet is impossible, but it would be unusual.

It seems to have lost some efficiency since the incident with the magnetic disc. I have to turn it up louder and I'm not sure it does sound the same as before.
Click to expand...
I doubt it. You'd be hard pressed to tell the difference between seven and eight drivers. I expect this is totally a placebo effect. You expect it to sound different, so it does. Testing the cab is a simple affair, use a 9v battery, see if all the cones move in unison. If they do then they all work.
 
#26
How the disc made its entrance.Playing and the cab was making that buzzing noise. Kept having to turn the volume up on the amp.I cranked the volume to full. 800 watt cab, 150 watt head, what harm could it do. Wham! the disc is stuck to the inside of the grille. What a suprise!
The placebo effect could be in full force. The 9 volt battery test. I will have to do that today. I'll have to go to the store and get one. Used my last one on a smoke detector a few days ago.

About sending the link to Laney. Without my wifes' help the pictues never would have made it you Jim. She helped but would have rather been playing angry birds.When she saw I was on talk bass, she said "what, you don't even fish?".
 
#27
The residue on the disc is not residue at all. Upon examining it with my glasses on, it seems that the silver color is plating and not on that spot. The surface under the plating is a tan metallic surface, like a very fine sandpaper.
 
#31
manktelow said:
The residue on the disc is not residue at all. Upon examining it with my glasses on, it seems that the silver color is plating and not on that spot. The surface under the plating is a tan metallic surface, like a very fine sandpaper.
Click to expand...

So it's a ceramic magnet, and not likely something that was a part of a component in the speaker.

My guess is that it was a completely unrelated item that accidentally got stuck to the inside of the grill by the space aliens that manufactured the cab. During shipping or at some point when you moved it it got bounced from the grill to the edge of one of the driver frames. Buzzing sound was it bouncing off the cone. Once you turned up enough the cone knocked it off and it stuck back to the grill, at which point you noticed it.

Email pics to Laney, tell them you found their long lost assimilation device, or something like that :p
 
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#33
This all reminds me of when I noticed mud on all sides of my truck's bed. What's more, the trash I had planned to take to the dump was missing. I suspected co-workers of putting my trash in the dumpster at work, but I couldn't figure out the mud on the sides and on the tailgate.

I believe I later solved my own mystery one night whilst smoking on my carport. There just happened to be a shadowy figure in the neighbor's front yard - big, black, and furry.
 
#34
Could it have been stuck on the grill behind the Laney emblem . Is the Laney emblem metal or plastic , I assume its plastic . If the emblem is metal could it have been used to temporarily hold the emblem in place while the emblem was fixed to the grill at the factory ? If the emblem is metal will it stick to the emblem ? Or maybe it was just stuck back there on the grill hiding till you really cranked it and it bounced off ??? If it was behind the emblem that would be why no one saw it in the factory , store or otherwise till now. Disgruntled employee ? Or maybe it was built on a Monday morning, LOL . Its got me puzzled .
 
#35
Okay. I have performed the 9 volt battery test. All speakers work. That's great news for me. Thank you Bill Fitzmaurice for that suggestion.
So it's a ceramic magnet. It could not have come from a neodymium speaker. More good news. Thank you Jim Was Here for that piece of information.
The Laney emblem is plastic and the disc could have been stuck to the back of it during assembly to hold it in place against the metal grille. I wouldn't have noticed it. It is just the right size and in close proximity to where the disc made its appearance. Jammin Johneboy, I think you got it.

Thank You everyone for your help in solving this mystery with me! I knew with all the knowledgeable and helpful members of Talk Bass that this would be solved. Again, Thank You All.
 
#36
Ladies and gentlemen! We have new evidence possibly concerning this mystery! Here is a picture of a speaker from my Laney Nexus 410, model the same as in the OP.

Link Removed

As you can see, there's a hole in the side of the speaker. If you look close enough, you can see a similar disc, as the one the OP posted earlier, stuck to the back of the speaker i.e. to the "main magnet" of the speaker.

So the speaker is broken.

But when I got home and found this thread, I decided to try out the speaker with my home stereo, and believe it or not, it produces audible sound, decent volume and surprisingly good sound.

Any insight to what might have happened would be most appreciated.
 
#37
Ha! I remember this thread.

If that hole down by the spider there is underneath the dustcap, meaning not visible from the outside, the speaker would still look and sound the same from the outside. You still have the full, intact area of the cone pushing air. Although, that spot is now weakened and will tear further and eventually fail after enough play time.


Now.....how are these drivers assembled during manufacture? Would there be a reason to have a disc like that in place during the manufacture of the voice coil former itself, that should've been punched out or otherwise removed during assembly of the rest of the driver?

And, how did the OP's disc end up between the baffle and grill of his sealed cab with no apparent outward damage to his cones?

With answers come more questions.....
 
#38
All valid questions. My best guess at at the moment is that the discs are used in the manufacture of the speakers, and for some reason one of them was left in my speaker. And for some reason one was left in the OP:s cabinet. Perplexing.

Another foto showing my speaker and the disc:

Link Removed
 
#39
Wierd. If will33 is right and the speaker is functional, maybe just the tear can be repaired with some tissue paper and rubber cement to prevent the damage from spreading. Otherwise a recone is necessary.
 

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