http://www.audioasylum.com/forums/hu...13/137684.html
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And that giant horn also serves as a diffusor, neat!!
Another interesting implementation, with a bass horn under a stage:
http://www.diyaudio.com/forums/showt...27#post1649627
What is wrong with watts RMS?
No, that's average power, or W avg.
The root mean square value of power is completely meaningless, every serious manufacturer knows this and will never rate an amplifier or speaker using WRMS.
http://www.hifi-writer.com/he/misc/rmspower.htm
http://en.wikipedia.org/wiki/RMS_power
More technical:
http://www.eznec.com/Amateur/RMS_Power.pdf
Of course, this term is rooted so deep in the common vernacular that it's hard to get of it :)
I see your point. But I still do think it makes sence as a "common" word. Not sure if that is the right term. If you say average power, it is not immidiate apparant that you are talking about the power of the RMS voltage.
If you just say average power, it could mean different things. It could mean the equivalent DC power, or the avereage over a certain time.
But academically you are quite correct, and I was "in error". It will not happen again. I promiss :o:
ummmmm......average value is the average of the sine wave. RMS is the equivalent to DC power. 100watts RMS is the same as 100 watts at DC! It is the value that is used to calculate current and such and allows us to used ohms law to work things out. Although it doesnt exist per se, it is impotant.
No error from your part and I agree with you on one point, it's a common word and people agree on its meaning even if it's not the right word to use for that meaning.
And I'm not bashing the individuals, especially the less knowledgeable for the use of the term, but rather the manufacturers and people in this field of activity. They should know better.
However I still think we should try to make the effort of using the more accurate "average power" for the sake of education and to stop perpetuating a misnomer, after all it's one of the goals of this forum, share the knowledge ;)
100watts RMS is the same as 100 watts at DC
No! 100W average is the same as 100W of DC.
Re-read this article:
http://www.eznec.com/Amateur/RMS_Power.pdf
The RMS value of the power is meaningless and useless
What is important to know is that the RMS value of the voltage of a sine wave going through a load is used to determine the heating power.
In easy terms,
7.07V peak (5VRMS) through a load of 10 ohms is 2.5Wavg
5VDC through the same load is also 2.5W
However if you take 7.07V peak into 10 ohms it gives 5W peak, but the RMS value of this 5W is 3.53WRMS, not the 2.5W of heating power.
The RMS value of sine wave power is NOT the power of the RMS Voltage into a given load. It's meaningless
What should we be saying then?
How should the power handling of a speaker be expressed?
This is one of those tricky ones, just like dB when used to state SPL.
If I remember correctly, I think Phons is the correct terminology for loudness, isn't it?
Correct me or shoot me if I'm wrong.... :o:
dBSPL is clearly defined, and should not be confused with intensity.
Power handling of a speakers should just be watts. Continous and peak.
-Tim
ok - back to the links with pictures of horns, this time some JBL to drool over
http://photosynth.net/view.aspx?cid=...1-d5ee78fe573b
3D view of dealer showroom auto-comosited courtesy Microsoft and someone with the tag: subsoniq