What is a good way to measure peak watts I'm using during music?
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forr
diyAudio Member

Join Date: Dec 2004
Location: Next door
Hi,

Quote:
 Most of us monitor voltage. That is NOT the same as monitoring power! To monitor power one must instananeously read both current and voltage at the load and then multiply the two readings/measurements, the result is instantaneous power delivered to the load.
Mutliply current and voltage and cosine of phase between both.
This is why, at low frequencies, there is not much power dissipated in the voice coils.

Quote:
 There are IC chips that do that. But, in general they do not have a big range, unless they are very complicated and thus expensive.
I am interested. Can you give some references ?

 15th September 2012, 03:57 PM #23 DUG   diyAudio Member   Join Date: Jan 2003 Location: mississauga ontario canada AD633JRZ In Digi-Key search for multiplier ic Linear - Analog Multipliers, Dividers then select 4-quadrant learn well __________________ Doug We are all learning...we can all help "You can't stop the signal, Mal. Everything goes somewhere..."
 15th September 2012, 04:19 PM #24 destroyer X   diyAudio Member     Join Date: Feb 2004 Location: Recife - Brasil Northeast The way is to plug a scope, to read the peak to peak and calculate. Carlos __________________ Dx unbeatable amplifiers; https://www.youtube.com/watch?v=u4tGBiqMnzQ
AndrewT
diyAudio Member

Join Date: Jul 2004
Location: Scottish Borders
Quote:
 Originally Posted by forr Mutliply current and voltage and cosine of phase between both.
you don't need cosine.
The instantaneous power is simply the current times the voltage at that instant.
__________________
regards Andrew T.

AndrewT
diyAudio Member

Join Date: Jul 2004
Location: Scottish Borders
Quote:
 Originally Posted by destroyer X The way is to plug a scope, to read the peak to peak and calculate.
No, that does not tell you or any one else the current.
P=IV

You need both to calculate power.
__________________
regards Andrew T.

 15th September 2012, 04:45 PM #27 Pano   diyAudio Moderator     Join Date: Oct 2004 Location: SW Florida Yeah, with a digital source, it isn't that hard. Actually measuring the current and voltage, or finding a fast watt-meter is best, but you can get a very good idea just from measuring a test tone. As for dynamics, most CDs don't have as much as you might think.* A typical ratio of average to peak is 18dB. Some better CDs will have 22dB or more range . If the recorded passage is lower than that, it probably is not meant to be loud. Think about it. Quiet passages are mot meant to be at 80dB SPL. *I've analyzed about 16000 tracks. 16dB from average to peak is typical of good pop, jazz, rock. Classical and well mastered stuff can be at about 22dB peak/average. Recent "squashed" mastering is about 10dB below peak with a good bit of clipping. __________________ Take the Speaker Voltage Test!
 15th September 2012, 07:42 PM #28 destroyer X   diyAudio Member     Join Date: Feb 2004 Location: Recife - Brasil Northeast All you need is a scope, the music playing and a scope of course the knowledge how to measure is needed too.... you need speaker too It is simple and there's no tips and tricks for that. regards, Carlos
forr
diyAudio Member

Join Date: Dec 2004
Location: Next door
Quote:
 Originally Posted by AndrewT you don't need cosine. The instantaneous power is simply the current times the voltage at that instant.
Instantaneous voltages and instantaneous currents are significant values.
Instantaneous powers are not. Electrical power needs some amount of time to show its effets.

forr
diyAudio Member

Join Date: Dec 2004
Location: Next door
Quote:
 Originally Posted by Pano As for dynamics, most CDs don't have as much as you might think.* A typical ratio of average to peak is 18dB. Some better CDs will have 22dB or more range . If the recorded passage is lower than that, it probably is not meant to be loud. Think about it. Quiet passages are mot meant to be at 80dB SPL. *I've analyzed about 16000 tracks. 16dB from average to peak is typical of good pop, jazz, rock. Classical and well mastered stuff can be at about 22dB peak/average. Recent "squashed" mastering is about 10dB below peak with a good bit of clipping.
I collect this kind of data. Yours agree with others I already have.

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