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Please Read and express your feelings and opinions....

I noticed  that lately or maybe for the last five yrs, there is so much arguments,name calling, attacking cables , speakers , components makers and more, more of disagreement with members, even Audio dealers are being attack here...Very few know how to apologize when they are wrong.What can we do as Audiogon members to improve our communication to each other? How to give the informations, recommendation to members who need it? This is without involving Audiogon, any opinion or ideas ,  For me this is fun and place to learn in audio...thank you all
128x128jayctoy
kosst_amojan
2,095 posts
 
Looks like we're seeing that cult of anti-intellectualism rearing it's ugly head here. I can't believe I'm reading somebody lecture a legit engineer on why he should ignore blatant failures of reason. It doesn't get more obvious than that. 
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cj1965
124 posts
 
@atmasphere

You’re using the wrong formula - equating electrical power to sound power. The db formula for sound power is :

10 X log 10 (P/Po) db

where P is the measured sound power and Po is the reference level.

If you doubt me, look it up. I believe it’s spelled out pretty clearly in Wikipedia.

And sound power is a function of the force applied, (in this case the voltage) along with the area and displacement over which that force is applied. When you halve the force and double the area, you wind up with roughly the same sound power that you began with. But improved acoustical coupling with increased area improves net efficiency (electrical power in versus sound power out).
atmasphere's avatar
atmasphere
7,068 posts
 
You’re using the wrong formula - equating electrical power to sound power. The db formula for sound power is :
I was using the right formula as I was referring to amplifier power, not sound pressure and was pretty clear about that.

When you halve the force and double the area, you wind up with roughly the same sound power that you began with. But improved acoustical coupling with increased area improves net efficiency (electrical power in versus sound power out).
Again, halving the **voltage** reduces the force to 1/4th.
cj1965
124 posts
 
" Again, halving the **voltage** reduces the force to 1/4th. " - atmasphere

Really? Are you serious? What do you think voltage is, my friend? Voltage is "electro motive FORCE". Halving the voltage does not reduce the force to 1/4. It reduces power to 1/4 since the formula for power  expressed simply with voltage and resistance is:

V squared divided by resistance.

Look, I didn’t come here to give lectures on Electrical Theory Basics. This is getting embarrassing. Please review your textbooks. I can’t continue to carry on a technical conversation with you if you fail to grasp the basics.
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