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ohmage vs. wattage?


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deraynged 
Member - Posts: 8
Member spacespace
Joined: January 14, 2006
Location: Virgin Islands
Posted: January 28, 2006 at 12:33 AM / IP Logged  
looking for an amplifier to power three 10" eclipse aluminums rated at 400w/800w wired as a 2.6 ohm load. how much power would a 1200w @ 2ohm amp put out running a 2.67 ohm load? is there a calculator somewhere?
He Who Fights and Runs Away,
Gets Shot in the Back!!
wrathchild281 
Copper - Posts: 241
Copper spacespace
Joined: February 02, 2005
Location: United States
Posted: January 28, 2006 at 12:53 AM / IP Logged  
well it makes 1200 watts at 2 ohms and like 600 at 4 ohms then just figure out the middle of that and a then the middle of that again. so around 1000 watts roughly
dwarren 
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Posted: January 28, 2006 at 12:55 AM / IP Logged  

They will receive roughly 400 watts a piece, probably a little less, but there won't be an audible difference.

I assume the 800 watt rating is peak? Use the rms numbers on both subs and amps.

stevdart 
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Posted: January 28, 2006 at 1:09 AM / IP Logged  

No calculator for this that I know of.  It's just simple math, though, but write the results as you go through it.  You know what the rated output is at 2 ohms.  Now look at the rated output at 4 ohms.  Subtract the 4 ohm from the 2 ohm.  Divide that answer into two, and then add that result to the 4 ohm rating.  You now have an extrapolated 3 ohm output.

Compare the 3 ohm to the 2 ohm outputs.  Divide the difference between them by three to get  thirds.  Add one third to the 3 ohm output to get a 2.67 ohm result.

You can't extrapolate another "rated" output from only one given rating...but you can come up with a good guess as long as you have two ratings to work with.

heh heh....or do like wrathchild did and come up with the answer in your head.  ohmage vs. wattage? -- posted image.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
deraynged 
Member - Posts: 8
Member spacespace
Joined: January 14, 2006
Location: Virgin Islands
Posted: January 28, 2006 at 7:46 AM / IP Logged  
was never real good at math but i got it figured out.
given:
600w @ 4ohms / 1200w @ 2ohms
couple notepad scribbles later:
900w @ 3ohms / 1000w @ 2.67ohms
thanx again.
He Who Fights and Runs Away,
Gets Shot in the Back!!

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