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tweeter getting hot


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sp33doe 
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Posted: November 03, 2005 at 9:14 AM / IP Logged  

hi!!   what a great forum  you got here.

im new to this forum and just want to ask something, i added another tweeter to my car audio and the tweeter magnet gets hot.  What is the problem? anybody can help me on this  ??

later,,,,sp33doe

DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: November 03, 2005 at 9:53 AM / IP Logged  
Hi and welcome.  Speaker magnets do get hot as 90% or more of all the audio power you deliver to them is converted into heat.  But generally tweeters don't get too hot.  What's the tweeter, what's the amp, and how is it connected to the system?  What kind of crossover did you use?
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sp33doe 
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Posted: November 03, 2005 at 10:42 AM / IP Logged  

thanx for the warmth  welcome....

its a small tweeter that was given to me by my friend, there aint really no specification on the tweeter.

i didnt use any crossover. i just hook it up on an extension speaker wire coming out of the stock speaker

TruckSystem 
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Posted: November 03, 2005 at 11:15 AM / IP Logged  
Sounds like it is trying to produce too many frequences that it cannot and it is resulting in heat.
How does it sound even remotely decent set up like that out of curiosity.
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sp33doe 
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Posted: November 03, 2005 at 11:20 AM / IP Logged  
the sound is decent and its  really kicking   the only problem is its getting hot ,  no idea  why and im afraid to leave it thinking it might blow my head unit or any stock speaker in place
DYohn 
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Posted: November 03, 2005 at 11:53 AM / IP Logged  
Yes, without a crossover the tweeter is being overworked and will eventually blow or burn out.  That's why it is getting hot.  Continue like this and it will not last long.  You need to high-pass any tweeter and you'll need the technical specs to decide at what frequency.  What make/model is it?
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sp33doe 
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Posted: November 03, 2005 at 2:12 PM / IP Logged  

DYohn wrote:
Yes, without a crossover the tweeter is being overworked and will eventually blow or burn out.  That's why it is getting hot.  Continue like this and it will not last long.  You need to high-pass any tweeter and you'll need the technical specs to decide at what frequency.  What make/model is it?

no name on the tweeter

make and moel?    it a jeep liberty

DYohn 
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Joined: April 22, 2003
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Posted: November 03, 2005 at 7:02 PM / IP Logged  
No, I meant the make and model of the tweeter.  In any case, you're going to blow it if you don't get a crossover on it.  I suggest 12db/octave, 3500Hz.
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sp33doe 
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Posted: November 04, 2005 at 8:46 AM / IP Logged  

thanks for the advice,, ill go out and shop for crossovers

thanks again

later,, sp33doe

stevdart 
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Posted: November 04, 2005 at 9:16 AM / IP Logged  

It would be far simpler and probably about the same cost to just replace those factory speakers with coaxials that are already supplied with a mid/tweeter and tiny 1st order crossover.  The quality of the mid alone will most likely be much improved.  But, if you do want to try your hand at something new and gain a good learning experience, you can make the crossover yourself with parts from an audio retailer.

Here is a link to a crossover calculator  http://www.mhsoft.nl/spk_calc.asp#crossover  Since you don't know if the tweeter is 4 ohm or otherwise, you'll have to assume that both drivers are 4 ohms (if you can obtain a meter to measure resistance let us know).  Go to the 2nd order crossover and input type Butterworth and enter 3500 Hz, with each driver entered as 4 ohms.

tweeter getting hot -- posted image.

You will see values given for caps and coils (inductors) and a diagram for each of the two drivers.  Find the values of the caps here http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=72

...and the coils here http://www.partsexpress.com/webpage.cfm?&DID=7&WebPage_ID=313

Note:  these are the cheapest types of these components available but would be suitable for your project.  (But they are actually higher quality and handle more power than the typical crossover in a store-bought speaker system).  Now draw up your diagrams and put these values into it, selecting the value that is closest to what the calculator came up with.  With this info you can go locally and pick up the parts.

Here is some more info on building crossovers

http://www.partsexpress.com/resources/crossover/xoverfaqs.html

http://www.partsexpress.com/projectshowcase/xover/xover.html

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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