"melted" tweeter
byule
Posts: 9
So just the other day I took the grills off my RT800i speakers and inspected the tweeters. The shape of the domes look fine but on the bottom edges of both tweeter domes it looks almost like the tweeter started to belt. It is colored slightly brown and the dome does not sit properly like it originally did. I don't know much about blowing speakers but I was wondering if anybody know what causes this. Both of the speakers seem to have this damage but as far as I can tell the tweeters still sound good. Any info on this would be appreciated.
Post edited by byule on
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Under powering your speakers can cause this. When an amp clips it sends a burst of juice through your speakers, and the tweeters typically are what gets fried. Check your other post;)
BenPlease. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
Usually, with a blown tweeter, the voice coil will sieze, with no visible damage to the dome.
Can you post a pic? -
I have also blown a fair amount of tweeters in my 1.2TLS. Reason has always been not enough power in the amp. I am not sure how how your tweeters are built but if your tweeters has any similarity to the SL3000 tweeters it looks like there is a damage to the coil that surrounds the dome at the base. My tweeters did also not give up completely when they where damaged. As you seem to have damaged both maybe you dont hear the difference so clearly.HT/2 CH
McIntosh MX120, MC500, MC206, MEN220
polkaudio SDA SRS 1.2TL, XO, Inductor, Tweeter, Larry's rings, WBT Binding posts, Moretite and Dynamat mod. Built by Mollie Jones 27:th of February 1991, CS350-LS XO mod, LS-f/x, DSW MicroPro 4000
MIT Shotgun S3.3 Bi-wire SC, Shotgun S3.3 SC, Shotgun S3.3 Proline IC, Shotgun S3.3 IC, Shotgun S3.3 Sub cable, AVT 1 Optical IC, EXP 3 Speaker interconnect. -
Since the area in question is at the bottom of both tweeters and you say they both still sound ok, I think what you are seeing may be the build up of ferromagnetic fluid. This is a fluid used to help keep the voice coil from overheating. If you can, rotate the position of the tweeters 180 degrees. This will allow the fluid to flow out evenly again.
On the other hand, they could be cooked. What are you using for power and how high have you had the volume level?Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
First i'd like to say thanks for the replies, sorry i couldn't reply sooner i've been out of town.
The speakers in question use to be my dad's so i'm not exactly sure what he was driving them with but I know it was a pretty high end Marantz receiver with more than enough power to push them. As for listening level I cannot accurately comment on that. I've attached a pic of one of the tweeters.
Thanks again for the help
Ben
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What the hell? They do look melted. That's a new one for me.
Did you purchase the speakers used? It almost looks like someone has tinkered with them at some point.~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~ -
They got hot. They were probably smoking and you didn't notice it. Its always a scarey thing when there is smoke coming from your tweeter.
Anyway, the tweeter is either toast or very close to becoming toast.
In any event, you will have to replace it and BE MORE CAREFUL NEXT TIME! -
Agreed, it's toast!
BTW, no such thing as an high end receiver.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
That's a given, but what caused it? I have never blown a tweet. I have, however, played at performance levels for 8 hour [or more] periods at twice+ the recommended wattage and I have yet to experience what happened to this tweeter.
???~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~ -
Repeated clipping?~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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That's a given, but what caused it? I have never blown a tweet. I have, however, played at performance levels for 8 hour [or more] periods at twice+ the recommended wattage and I have yet to experience what happened to this tweeter.
???
What are you driving yours with?
Did you turn it up till you could hear it distorting?
Lots of CLEAN power is a good thing;)Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
That's a given, but what caused it? I have never blown a tweet. I have, however, played at performance levels for 8 hour [or more] periods at twice+ the recommended wattage and I have yet to experience what happened to this tweeter.
???
I've experienced this using a Yammi receiver. Its not a good thing. -
Currently a Carver M-500t. Too many to remember.ben62670 wrote:What are you driving yours with?
Generally no. I say generally because I am always testing the limits of whatever rig I am running at the time, and as soon as I hear distortion, I turn it down because it drives the living **** out of me to hear distortion of any kind. Other than that, no.ben62670 wrote:Did you turn it up till you could hear it distorting?~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~ -
My SL3000's burned up without a hint of distortion. It was Pink Floyd's Time (alarm clocks and chimes) that caused them to melt. I looked at the speaker and smoke was coming out the grill. Stinky too. Yammi receiver was set at about 12 o'clock. Not a hint of distortion. Polyswitches were useless.
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Thanks for the help guys, you've been really helpful.
