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Thread: Whats the way to figure how minny watts you're amp is really pushing by the fuses? |
    
Gold Member Username: Taylor17
Kopperl,
Texas
Post Number: 1281
Registered: Jan-05
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| Posted on Monday, April 04, 2005 - 09:29 pm: |
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I remember someone saying that the real way to see what you're amp pushes is to like add the total fuse rating's and then do someing... I was just wondering, how you figure this out??
For example, my amp has a fuse rating of 40A x 3. |
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| Posted on Monday, April 04, 2005 - 09:33 pm: |
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i wished i knew the answer to that cause i have a 500 max watt amp pushin 2 12 inch 500 watt max subs and i have had one problem with anything the subs sound great. |
Gold Member Username: Taylor17
Kopperl,
Texas
Post Number: 1282
Registered: Jan-05
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| Posted on Monday, April 04, 2005 - 09:53 pm: |
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Lol, my amp is only supposed to be a 800 watt rms amp, but I think it is pushing a little more than they say.
3 40A fuses seems a little big to me, but then agen, thats why I'm asking how to figure this up...:-) |
Gold Member Username: Taylor17
Kopperl,
Texas
Post Number: 1285
Registered: Jan-05
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| Posted on Tuesday, April 05, 2005 - 08:12 am: |
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??? |
Gold Member Username: Carguy
Post Number: 2170
Registered: Nov-04
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| Posted on Tuesday, April 05, 2005 - 10:02 am: |
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A fuse size is a good start. If you really want to know, then get a DMM and measure the current flow when the amp is pusing.
To find power, take current reading multiply by voltage on the power wire. The total you get is the power being pushed by the amp.
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Silver Member Username: Fishy
Tamarac Ft.Laud,
FL
USA
Post Number: 851
Registered: Sep-04
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| Posted on Tuesday, April 05, 2005 - 05:53 pm: |
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Not a good idea unless you've got an industrial strength multimeter. Most meters are good for 10 amps max(140 watts @ 14v). In addition this method only gives you the amount of power your amp is using, not producing. Power output depends on an amplifier's efficiency as well.
An accurate measurement of an amplifier's output should be measured on well...... its outputs. It would require mesuring the voltage on an output across a dummy resistor and then using the following equations to determine power.
V = I * R
and
P = I * V
=>
P = V^2/R
See here for more details:
http://www.bcae1.com/measpwr.htm
All I can say is good luck finding a big enough resistor if your amp's pushing 500-1000 watts.
Using fuse ratings can tell you the maximum power your amp could produce(P=I*V = fuse rating * 14.4v on a 100% efficient amp) w/o blowing the fuse, but won't help you determine what its actually producing. For exmple I own a 360 watt Xtant with a 60 amp fuse and a PPI pro MOS 2050(~400 watts 2 ohm bridged) that came with a 35 amp guy. Needless to say I would blow that lil sucker every once in a while when I pushed it and ended up using a 40 amp instead.
-Fishy |
Silver Member Username: Southernrebel
Monroe,
Louisiana
USA
Post Number: 500
Registered: Mar-04
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| Posted on Tuesday, April 05, 2005 - 06:05 pm: |
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^^^what he said^^^
you can also use the method...w/ a few changes...to find your box rise.
all you need a DMM and a Clamp meter. |
Gold Member Username: Taylor17
Kopperl,
Texas
Post Number: 1286
Registered: Jan-05
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| Posted on Wednesday, April 06, 2005 - 01:39 pm: |
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ok cool. Where could I get some of this equip to do this, and how much do they cost?
Thanks for the help. |
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