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OA good way to tell amp power?

 

Jon Hill
Bronze Member
Username: Boxy_brown

Post Number: 14
Registered: Nov-06
Posted on   
i was at dr dash. and they said that a good way to tell amp power is take the fuses and times them by 12 i was just checking to see if this really is a good way to find amp power
 

lucas beckner
Gold Member
Username: Lbeckner

Tulsa, Ok Usa

Post Number: 1390
Registered: Oct-04
Posted on   
not really. if the amp is a class D amp then multiply that number by .7 and if it is a class A/B then multiply that number by .5 You can get a rough estimate. also if you have the amp then just measure the output voltage. then use e^2/Re to get power.
 

Optidriven
Gold Member
Username: N2audio

Lawrence, Ks USA

Post Number: 1045
Registered: Mar-04
Posted on   
e²/r doesn't tell you much unless you know the amp isn't clipping, and without a scope you wouldn't know.

I use fuse rating x10 as a general estimate of amp power.
 

lucas beckner
Gold Member
Username: Lbeckner

Tulsa, Ok Usa

Post Number: 1391
Registered: Oct-04
Posted on   
if it clips then you have reached the voltage peak. take that voltage and put it into ohm's law and you will get power.
 

Optidriven
Gold Member
Username: N2audio

Lawrence, Ks USA

Post Number: 1057
Registered: Mar-04
Posted on   
huh, never seen that mentioned before, but it's perfectly logical.
 

Optidriven
Gold Member
Username: N2audio

Lawrence, Ks USA

Post Number: 1058
Registered: Mar-04
Posted on   
just got a reply from the author of bcae1.com

"The voltage reading will not stop at or near clipping. The voltage would only stop increasing when the output was a perfect square wave."

So there ya have it.
 

lucas beckner
Gold Member
Username: Lbeckner

Tulsa, Ok Usa

Post Number: 1393
Registered: Oct-04
Posted on   
isn't that why you would use a true rms meter?
 

Isaac
Gold Member
Username: Carguy

Post Number: 5807
Registered: Nov-04
Posted on   
Good info Opti, I was wondering how it was possible to tell when an amp clipped with DMM alone.
 

Optidriven
Gold Member
Username: N2audio

Lawrence, Ks USA

Post Number: 1059
Registered: Mar-04
Posted on   
doesn't have anything to do with it AFAIK.
any basic dmm measures rms ac voltage. I know if I take my $10 wal-mart dmm and measure wall voltage I get 120, not 170.

Not sure how that relates to Perry's explanation anyway.
 

Optidriven
Gold Member
Username: N2audio

Lawrence, Ks USA

Post Number: 1060
Registered: Mar-04
Posted on   
fwiw - that last post was in response to Lucas. Isaac jumped in b4 I submitted
 

lucas beckner
Gold Member
Username: Lbeckner

Tulsa, Ok Usa

Post Number: 1394
Registered: Oct-04
Posted on   
yeah that makes sense, but what is AFAIK?
 

Optidriven
Gold Member
Username: N2audio

Lawrence, Ks USA

Post Number: 1061
Registered: Mar-04
Posted on   
as far as I know
 

juliob
Gold Member
Username: Juliob

Santo DomingoDominican Re...

Post Number: 3724
Registered: Dec-05
Posted on   
 

lucas beckner
Gold Member
Username: Lbeckner

Tulsa, Ok Usa

Post Number: 1395
Registered: Oct-04
Posted on   
^^^^^post whor'e^^^^^^^
 

juliob
Gold Member
Username: Juliob

Santo DomingoDominican Re...

Post Number: 3730
Registered: Dec-05
Posted on   
^^^^f*ck you
 

lucas beckner
Gold Member
Username: Lbeckner

Tulsa, Ok Usa

Post Number: 1398
Registered: Oct-04
Posted on   
^^^^made my point^^^^^
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