| Author |
Thread: OA good way to tell amp power? |
    
Bronze Member Username: Boxy_brown
Post Number: 14
Registered: Nov-06
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| Posted on Thursday, December 14, 2006 - 09:32 am: |
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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 |
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Gold Member Username: Lbeckner
Tulsa,
Ok
Usa
Post Number: 1390
Registered: Oct-04
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| Posted on Thursday, December 14, 2006 - 09:49 am: |
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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. |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1045
Registered: Mar-04
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| Posted on Thursday, December 14, 2006 - 10:47 am: |
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eČ/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. |
Gold Member Username: Lbeckner
Tulsa,
Ok
Usa
Post Number: 1391
Registered: Oct-04
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| Posted on Thursday, December 14, 2006 - 04:55 pm: |
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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. |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1057
Registered: Mar-04
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| Posted on Friday, December 15, 2006 - 12:25 pm: |
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huh, never seen that mentioned before, but it's perfectly logical. |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1058
Registered: Mar-04
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| Posted on Friday, December 15, 2006 - 12:51 pm: |
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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. |
Gold Member Username: Lbeckner
Tulsa,
Ok
Usa
Post Number: 1393
Registered: Oct-04
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| Posted on Friday, December 15, 2006 - 02:10 pm: |
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isn't that why you would use a true rms meter? |
Gold Member Username: Carguy
Post Number: 5807
Registered: Nov-04
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| Posted on Friday, December 15, 2006 - 03:10 pm: |
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Good info Opti, I was wondering how it was possible to tell when an amp clipped with DMM alone. |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1059
Registered: Mar-04
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| Posted on Friday, December 15, 2006 - 03:13 pm: |
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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. |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1060
Registered: Mar-04
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| Posted on Friday, December 15, 2006 - 03:16 pm: |
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fwiw - that last post was in response to Lucas. Isaac jumped in b4 I submitted |
Gold Member Username: Lbeckner
Tulsa,
Ok
Usa
Post Number: 1394
Registered: Oct-04
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| Posted on Friday, December 15, 2006 - 03:34 pm: |
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yeah that makes sense, but what is AFAIK? |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1061
Registered: Mar-04
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| Posted on Friday, December 15, 2006 - 03:35 pm: |
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as far as I know |
Gold Member Username: Juliob
Santo Domingo
Dominican Re...
Post Number: 3724
Registered: Dec-05
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| Posted on Friday, December 15, 2006 - 04:02 pm: |
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 |
Gold Member Username: Lbeckner
Tulsa,
Ok
Usa
Post Number: 1395
Registered: Oct-04
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| Posted on Friday, December 15, 2006 - 06:22 pm: |
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^^^^^post whor'e^^^^^^^ |
Gold Member Username: Juliob
Santo Domingo
Dominican Re...
Post Number: 3730
Registered: Dec-05
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| Posted on Friday, December 15, 2006 - 10:47 pm: |
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^^^^f*ck you |
Gold Member Username: Lbeckner
Tulsa,
Ok
Usa
Post Number: 1398
Registered: Oct-04
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| Posted on Saturday, December 16, 2006 - 03:15 am: |
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^^^^made my point^^^^^ |
