Subwoofers DO put out power

[Pickler 10+ year member]

Heat does not equal power. Heat is loss.
Thermal power is heat but in a different application.

Well I mean thermal power is heat but JLs are definitely the most efficient with the highest DB to power ratio.

 

[ciaonzo 5,000+ posts]

Heartbreaker.

 

[MakeshiftAudio 10+ year member]

Yes it will be. Not 1000 watts of mechanical/acoustical power, over 97% of the power sent to a subwoofer is converted to heat, but it will still be 1000 watts of total power output.

Some speakers are more efficient, but not 1% is converted into acoustic, it ranges generally 3-7% for most subs. If you want, I can prove this with a hell of a long equation that I do not want to explain. Hey. It's summer. Basically you can calculate how much energy is in a specific area from the output of the sub, compared to the origin. This can work with any sort of transducer, measured in dB. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[ciaonzo 5,000+ posts]

Dreammaker.

 

[newusername 10+ year member]

This is true. I posted about this in a thread a while ago, because for some reason it is one of those favourite attacks from people who understand car audio just enough to think they completely understand it.

 

[bose301s 5,000+ posts]

Heat does not equal power. Heat is loss.
Thermal power is heat but in a different application.

Wrong, read this article it doesn't exactly apply to subs, but it does show heat is power.

http://www.eejitsguides.com/environment/elec-voltage.html

 

[ciaonzo 5,000+ posts]

Lovetaker.

Dontchu mess around wit me.

NO NO NO!

 

[Papermaker85 5,000+ posts]

subwoofers CAN generate electrical power as well as mechanical power. there just extremely inefficent... converting electrical power to acoustical is highly dependant on the enviroment as well as frequency.. sound intensity is the result of the amount of pressure for a given amount of area and its medium..

this is whats called ACOUSTICAL POWER or sound power.. speakers CAN be extremely efficent....

if you apply an electrical input to a woofer it is considered mechanical power, the real difference between mechanical power and acoustical power is ability to move a medium over a given time frame.. this goes bach to dc operation VS ac operation....

 

[ciaonzo 5,000+ posts]

Transducer.

 

[mokedaddy 5,000+ posts]

Wrong, read this article it doesn't exactly apply to subs, but it does show heat is power.
http://www.eejitsguides.com/environment/elec-voltage.html

The heat does not do any work, thus its not power. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[newusername 10+ year member]

Can someone find me a subwoofer that is 7% efficient?

I doubt any of us would want it. You know, Hoffman's Iron Law and what not.

 

[newusername 10+ year member]

Transducer.

Bingo. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[ciaonzo 5,000+ posts]

Can someone find me a subwoofer that is 7% efficient?
I doubt any of us would want it. You know, Hoffman's Iron Law and what not.

It would sound mighty lean me thinks.

 

[bose301s 5,000+ posts]

Some speakers are more efficient, but not 1% is converted into acoustic, it ranges generally 3-7% for most subs. If you want, I can prove this with a hell of a long equation that I do not want to explain. Hey. It's summer. Basically you can calculate how much energy is in a specific area from the output of the sub, compared to the origin. This can work with any sort of transducer, measured in dB. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Actually incorrect, read the first page of this document where they go through the derivation of true efficiency of a sub. The vast majority of subs are under 1% of electrical power converted to sound.

http://stereointegrity.com/Files/SPLCalculations.pdf

 

[Papermaker85 5,000+ posts]

Can someone find me a subwoofer that is 7% efficient?
I doubt any of us would want it. You know, Hoffman's Iron Law and what not.

sure tons, given the correct alignment...