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can high frequencies damage a subwoofer?


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jmelton86 
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Posted: July 26, 2007 at 6:32 PM / IP Logged  
Can high frequencies damage a subwoofer? Well, can they?
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installerman23 
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Posted: July 26, 2007 at 6:33 PM / IP Logged  
Yes.
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jmelton86 
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Can someone explain? I don't understand how. I know a woofer won't reproduce high frequencies as efficiently as a tweeter, but I don't see how they can damage a woofer.
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Alpine Guy 
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Posted: July 26, 2007 at 7:34 PM / IP Logged  
They can't damage a sub.
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DYohn 
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Posted: July 26, 2007 at 8:45 PM / IP Logged  

Alpine guy is right, a speaker is a speaker.  It's not frequency that can damage one, it's power.

There are many reasons why you want to block higher frequencies from reaching your sub, but damaging the speaker is not one of them.

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Steven Kephart 
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Posted: July 26, 2007 at 10:09 PM / IP Logged  

Here's proof that high frequencies can't harm a subwoofer:

http://www.realmofexcursion.com/videos/Adire/brahma12.13.wmv

The only speaker playing in that video is the sub.

sparky3489 
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Posted: July 26, 2007 at 11:36 PM / IP Logged  

I have to say I disagree as high frequency through a sub still puts the same power to it, but the cone travels less resulting in the coils to get hotter quicker which can cause warping. The sub is destroyed in a short amount of time, however this is ONLY if nothing but high frequency is pushed. The less high frequency you push to a sub the better.

This is why they have frequency responses.

DYohn 
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Posted: July 26, 2007 at 11:54 PM / IP Logged  
sparky3489 wrote:
I have to say I disagree as high frequency through a sub still puts the same power to it, but the cone travels less resulting in the coils to get hotter quicker which can cause warping. The sub is destroyed in a short amount of time, however this is ONLY if nothing but high frequency is pushed. The less high frequency you push to a sub the better.

This is why they have frequency responses.

This is absolutely incorrect.  Whoever told you this did not know what they were talking about.

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Steven Kephart 
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Posted: July 27, 2007 at 1:45 AM / IP Logged  
sparky3489 wrote:

I have to say I disagree as high frequency through a sub still puts the same power to it, but the cone travels less resulting in the coils to get hotter quicker which can cause warping. The sub is destroyed in a short amount of time, however this is ONLY if nothing but high frequency is pushed. The less high frequency you push to a sub the better.

This is why they have frequency responses.

Subwoofers have a very large coil of wire sitting around a large piece of metal which results in very high inductance.  Because of this, they have a built-in low pass filter.  This inductance combines with the DC resistance of the sub resulting in an increasing impedance with frequency.  This means that less power will be drawn from the amplifier at higher frequencies.

jmelton86 
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Posted: July 27, 2007 at 3:03 AM / IP Logged  
Also, i've never seen (higher end) speaker companies bragging about advanced cooling features on their tweeters. I do see your point on how since the sub doesn't move so much with higher frequencies it doesn't cool itsself, but it's not needed because of the higher impedance.
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