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Topic: Wear Mark on Speaker Cone |
Paul Hutzler
From:
Seattle, Wa
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Posted 8 Jan 2019 12:43 pm |
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What is this wear mark on my 20 year old JBL K130 15"? Or was it put there by the manufacturer?
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Carter S-10, Shobud D-10, Shobud Pro II D-10, Supro 8 String Lap Steel, Regal Black Lightening Dobro, and Excel D-10 with 10 pickups one for each string, one string for each amp |
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Erv Niehaus
From:
Litchfield, MN, USA
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Posted 8 Jan 2019 12:54 pm
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It almost looks like a water stain.
Erv |
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Godfrey Arthur
From:
3rd Rock
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Posted 8 Jan 2019 7:52 pm
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| Erv Niehaus wrote: |
It almost looks like a water stain.
Erv |
Or dope from the surround
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
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Craig A Davidson
From:
Wisconsin Rapids, Wisconsin USA
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Posted 9 Jan 2019 7:26 am
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| I would say it is where the speaker wires are connected to the cone. |
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Godfrey Arthur
From:
3rd Rock
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Posted 9 Jan 2019 9:48 am
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| Craig A Davidson wrote: |
| I would say it is where the speaker wires are connected to the cone. |
That too or this happened:
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
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Paul Hutzler
From:
Seattle, Wa
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Posted 9 Jan 2019 11:09 am
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Its not a water stain. Nor is it a lead wire. Its a wear mark...
_________________
Carter S-10, Shobud D-10, Shobud Pro II D-10, Supro 8 String Lap Steel, Regal Black Lightening Dobro, and Excel D-10 with 10 pickups one for each string, one string for each amp |
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Paul Hutzler
From:
Seattle, Wa
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Posted 9 Jan 2019 11:20 am
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Its not a water stain. Nor is it a lead wire. Its a wear mark...
_________________
Carter S-10, Shobud D-10, Shobud Pro II D-10, Supro 8 String Lap Steel, Regal Black Lightening Dobro, and Excel D-10 with 10 pickups one for each string, one string for each amp
Last edited by Paul Hutzler on 9 Jan 2019 11:27 am; edited 1 time in total |
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Godfrey Arthur
From:
3rd Rock
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Posted 9 Jan 2019 11:21 am
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| Paul Hutzler wrote: |
| Its not a water stain. Nor is it a lead wire. Its a wear mark... |
You mean from the metal frame rubbing?
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
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Erv Niehaus
From:
Litchfield, MN, USA
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Posted 9 Jan 2019 11:34 am
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Where is it, I don't see it?
Erv |
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Godfrey Arthur
From:
3rd Rock
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Posted 9 Jan 2019 11:40 am
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| Erv Niehaus wrote: |
Where is it, I don't see it?
Erv |
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
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Erv Niehaus
From:
Litchfield, MN, USA
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Posted 9 Jan 2019 11:48 am
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Water stain, it's even blue.
Erv |
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Godfrey Arthur
From:
3rd Rock
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Posted 9 Jan 2019 12:03 pm
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| Erv Niehaus wrote: |
Water stain, it's even blue.
Erv |
Dog peed in the pool, Erv...
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
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Jerry Overstreet
From:
Louisville Ky
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Posted 9 Jan 2019 12:13 pm
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| I would venture a guess that it's just discolored in that area from paper or cardboard on that area while being packaged or stored for a long time. JMO. |
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Paul Hutzler
From:
Seattle, Wa
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Posted 9 Jan 2019 12:34 pm
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Look up chladni plates on youtube. I think what I'm looking at is a wear mark from a standing wave on the speaker cone.
_________________
Carter S-10, Shobud D-10, Shobud Pro II D-10, Supro 8 String Lap Steel, Regal Black Lightening Dobro, and Excel D-10 with 10 pickups one for each string, one string for each amp |
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Godfrey Arthur
From:
3rd Rock
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Posted 9 Jan 2019 12:44 pm
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| Paul Hutzler wrote: |
| Look up chladni plates on youtube. I think what I'm looking at is a wear mark from a standing wave on the speaker cone. |
Interesting. But what material is being sonic-ally acted upon to create the mark?
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
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Paul Hutzler
From:
Seattle, Wa
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Posted 9 Jan 2019 1:06 pm
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Thanks for posting that GIF. I think the material being worked on is the paper cone itself.
_________________
Carter S-10, Shobud D-10, Shobud Pro II D-10, Supro 8 String Lap Steel, Regal Black Lightening Dobro, and Excel D-10 with 10 pickups one for each string, one string for each amp |
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Godfrey Arthur
From:
3rd Rock
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Posted 9 Jan 2019 1:12 pm
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| Paul Hutzler wrote: |
| Thanks for posting that GIF. I think the material being worked on is the paper cone itself. |
Yeah, could be minerals in moisture absorbed by the paper cone and then acted upon by the sound waves over a period of time.
_________________
ShoBud The Pro 1
YES it's my REAL NAME!
Ezekiel 33:7 |
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Paul Hutzler
From:
Seattle, Wa
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Posted 10 Jan 2019 3:36 pm
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At this point, I'm convinced that the wear marks on the speaker cone are from something over driving the voice coil. What happened is this voice coil traveled so far that it pushed the paper speaker cone up and wrinkled it. It created the weird wavey pattern just because thats the way the paper cone will fold when its shoved forward. Make sense? This is all from the amp tech too by the way.
_________________
Carter S-10, Shobud D-10, Shobud Pro II D-10, Supro 8 String Lap Steel, Regal Black Lightening Dobro, and Excel D-10 with 10 pickups one for each string, one string for each amp |
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Jack Hanson
From:
San Luis Valley, USA
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Posted 10 Jan 2019 4:09 pm
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Does the speaker sound okay? If so, it would be a moot point with me.
Makes for an interesting discussion, however. |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 10 Jan 2019 6:55 pm
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| Paul Hutzler wrote: |
| Look up chladni plates on youtube. I think what I'm looking at is a wear mark from a standing wave on the speaker cone. |
Except that I don't think you'd see a standing wave-shape like that on a conical surface. Besides, any "wear mark" would likely have degraded the fragile surface of the paper cone. The surface of the cone (in the area under discussion) looks to be almost pristine? I think it's possibly the result of someone using a liquid (alcohol?) to clean/polish the aluminum dust cap, and capillary action spread it through a larger area. |
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Erv Niehaus
From:
Litchfield, MN, USA
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Posted 11 Jan 2019 8:38 am
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I'll bet some little boy peed on it! 
Ervf |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 13 Jan 2019 8:16 am
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| Paul Hutzler wrote: |
| Thanks for posting that GIF. I think the material being worked on is the paper cone itself. |
I doubt that. Thin metal plates are the most commonly used materials for this type of standing wave demonstrations, and they use black plates because the table salt they normally use for a vibration medium will show up better. |
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Carl Mesrobian
From:
Salem, Massachusetts, USA
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Posted 16 Jan 2019 7:15 pm
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Migrating oils from the adhesive from the dustcap ?? Has the dustcap been recently reglued?
EDIT - Is the surface of the cone wavy or smooth?
_________________
--carl
"The better it gets, the fewer of us know it." Ray Brown |
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Paul Hutzler
From:
Seattle, Wa
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Posted 17 Jan 2019 3:36 pm
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The wavey line is from "over excursion." The amp was cranked very loud at some point. The voice coil traveled too far. The paper speaker cone got squished as the voice coil pushed forward. The paper cone creased into the weird wavy line pattern.
_________________
Carter S-10, Shobud D-10, Shobud Pro II D-10, Supro 8 String Lap Steel, Regal Black Lightening Dobro, and Excel D-10 with 10 pickups one for each string, one string for each amp |
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