Measuring audio power ...
 

"Arfa Daily"


It was just for interest then that I asked the question about whether
'real' meters read the power in the whole wave, or just one half. So when
an amp says its output is 50w RMS, setting aside all the debate about
whether RMS is valid, just taking it to mean what we all know the
manufacturers want us understand by that, is it 100 watts of power
contained in one half cycle, or one whole cycle. I'm sure you all know
what I mean - I'm just not putting it very well ...



** The question is completely asinine.

Comes from a TV repair tech - right ?




........ Phil

Measuring audio power ...
 

"Phil Allison" wrote in message
...

"Arfa Daily"


It was just for interest then that I asked the question about whether
'real' meters read the power in the whole wave, or just one half. So when
an amp says its output is 50w RMS, setting aside all the debate about
whether RMS is valid, just taking it to mean what we all know the
manufacturers want us understand by that, is it 100 watts of power
contained in one half cycle, or one whole cycle. I'm sure you all know
what I mean - I'm just not putting it very well ...



** The question is completely asinine.

Comes from a TV repair tech - right ?




....... Phil






It's funny how often you use that word, Phil. Did you originally find out
its meaning, after how many times it had been said to you ?

You may consider me, and my question stupid, and that's your self-perceived
prerogative, but trust me pal, it's nothing to what I consider you to be ...

Arfa

Measuring audio power ...
 

"Arfa Daily the Con Man "

It was just for interest then that I asked the question about whether
'real' meters read the power in the whole wave, or just one half. So
when an amp says its output is 50w RMS, setting aside all the debate
about whether RMS is valid, just taking it to mean what we all know the
manufacturers want us understand by that, is it 100 watts of power
contained in one half cycle, or one whole cycle. I'm sure you all know
what I mean - I'm just not putting it very well ...


** The question is completely asinine.

Comes from a TV repair tech - right ?



It's funny how often you use that word, Phil.


** If the cap fits - dickheads have to wear it.


You may consider me, and my question stupid,


** No - I said completely ASININE !!

ONLY a complete technical nincompoop could imagine it even made sense.






....... Phil

Measuring audio power ...
 

"Phil Allison" wrote in message
...

"Arfa Daily the Con Man "

It was just for interest then that I asked the question about whether
'real' meters read the power in the whole wave, or just one half. So
when an amp says its output is 50w RMS, setting aside all the debate
about whether RMS is valid, just taking it to mean what we all know the
manufacturers want us understand by that, is it 100 watts of power
contained in one half cycle, or one whole cycle. I'm sure you all know
what I mean - I'm just not putting it very well ...


** The question is completely asinine.

Comes from a TV repair tech - right ?



It's funny how often you use that word, Phil.


** If the cap fits - dickheads have to wear it.


You may consider me, and my question stupid,


** No - I said completely ASININE !!

ONLY a complete technical nincompoop could imagine it even made sense.






...... Phil



Asinine Oxford English Dictionary Adjective " of asses ; stupid "

Asinine Funk & Wagnalls Practical Standard Dictionary Adjective "
Pertaining to, or like an ass ; stupid ; silly

When you can speak and understand the Queen's English, and not some
*******ised four X-soaked antipodean version, please feel free to correct my
understanding of english words. Until such time, stick to shooting dingos
for your tea, or whatever it is you do.

Arfa

Measuring audio power ...
 

On Sun, 25 Jun 2006 20:01:55 GMT, "Arfa Daily"
wrote:

It was just for interest then that I asked the question about whether 'real'
meters read the power in the whole wave, or just one half. So when an amp
says its output is 50w RMS, setting aside all the debate about whether RMS
is valid, just taking it to mean what we all know the manufacturers want us
understand by that, is it 100 watts of power contained in one half cycle, or
one whole cycle. I'm sure you all know what I mean - I'm just not putting it
very well ...

Arfa


The specification for power - often mistakenly called RMS power - is
actually for average power. If you look at a sine wave that has been
mathematically squared, which you need to do to get power, you will
see that one complete cycle comprises two upward humps. The average of
one of those humps, which corresponds to half a cycle, will do just as
well as the average of two for establishing power.

Obviously if you are using music rather than sine waves it is quite
likely that those two humps will not be the same size, a quite normal
situation where the signal is bigger one way than the other. In that
circumstance, you do need the average of both those humps, not just
the one. So for music, you really need full-wave rectification, while
for sine waves, half wave is every bit as good.

d

--
Pearce Consulting
http://www.pearce.uk.com

Spineless creep
 

"Phil Allison" wrote in message
...

"Keith Gutless Wonder "



** An even dumber pommy turd than I thought.







....... Phool



Whereas I was right on the money first time with you - see the Subject
Line....

Measuring audio power ...
 

"Arfa Daily" wrote in message
...

"Phil Allison" wrote in message
...

"Arfa Daily the Con Man "

It was just for interest then that I asked the question about whether
'real' meters read the power in the whole wave, or just one half. So
when an amp says its output is 50w RMS, setting aside all the debate
about whether RMS is valid, just taking it to mean what we all know
the manufacturers want us understand by that, is it 100 watts of power
contained in one half cycle, or one whole cycle. I'm sure you all know
what I mean - I'm just not putting it very well ...


** The question is completely asinine.

Comes from a TV repair tech - right ?



It's funny how often you use that word, Phil.


** If the cap fits - dickheads have to wear it.


You may consider me, and my question stupid,


** No - I said completely ASININE !!

ONLY a complete technical nincompoop could imagine it even made sense.






...... Phil



Asinine Oxford English Dictionary Adjective " of asses ; stupid
"

Asinine Funk & Wagnalls Practical Standard Dictionary Adjective "
Pertaining to, or like an ass ; stupid ; silly

When you can speak and understand the Queen's English, and not some
*******ised four X-soaked antipodean version, please feel free to correct
my understanding of english words. Until such time, stick to shooting
dingos for your tea, or whatever it is you do.



I think if that clueless **** tried to shoot a dingo it'd have *him* for
tea...!!

In fact, I *know it*.....

*Australia's Finest*.....!!

(Ya hafta fekkin' larf, don'tcha? :-))

Measuring audio power ...
 

"Don Pearce" wrote in message
...
On Sun, 25 Jun 2006 20:01:55 GMT, "Arfa Daily"
wrote:

It was just for interest then that I asked the question about whether
'real'
meters read the power in the whole wave, or just one half. So when an amp
says its output is 50w RMS, setting aside all the debate about whether RMS
is valid, just taking it to mean what we all know the manufacturers want
us
understand by that, is it 100 watts of power contained in one half cycle,
or
one whole cycle. I'm sure you all know what I mean - I'm just not putting
it
very well ...

Arfa


The specification for power - often mistakenly called RMS power - is
actually for average power. If you look at a sine wave that has been
mathematically squared, which you need to do to get power, you will
see that one complete cycle comprises two upward humps. The average of
one of those humps, which corresponds to half a cycle, will do just as
well as the average of two for establishing power.

Obviously if you are using music rather than sine waves it is quite
likely that those two humps will not be the same size, a quite normal
situation where the signal is bigger one way than the other. In that
circumstance, you do need the average of both those humps, not just
the one. So for music, you really need full-wave rectification, while
for sine waves, half wave is every bit as good.

d

--
Pearce Consulting
http://www.pearce.uk.com

Thanks Don. Useful input.

Arfa

Measuring audio power ...
 

Don Pearce wrote:
If you really want to measure power accurately, use a resistor as
the
load, and measure its temperature.

d


lol

I like that way




--
Dave
www.davewhitter.myby.co.uk

Music is Art - Audio is Engineering
Steam is Fun

PISS OFF - TV TECH MORON
 

"Arfa Daily the Con Man ****wit "


** The question is completely asinine.

Comes from a TV repair tech - right ?

I said completely ASININE !!

ONLY a complete technical nincompoop could imagine it even made sense.


**** OFF - YOU BRAIN DEAD

POMMY MORON FROM HELL !!!






........ Phil