Author Topic: Ohms Law and Wattage  (Read 2575 times)

Offline Pantera

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Ohms Law and Wattage
« on: March 31, 2016, 10:32:43 AM »
If a WTX500 puts out 500 watts into 4 ohms, why is it that it is stated to produce 280 Watts into 8 ohms? This goes against Ohms Law. Please clarify.
 

Online Bassmann1968

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Re: Ohms Law and Wattage
« Reply #1 on: March 31, 2016, 10:44:44 AM »
Someone who knows the ohms law should also know that there are other restrictions :D

To give yoz a better answer, you got to seee it the other way around.
It puts out 280 W at 8 ohm, but does not but out 560 W at 4 ohm due to power supply restrictions.
I hope this helps.
Armin

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WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112

Offline Pantera

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Re: Ohms Law and Wattage
« Reply #2 on: March 31, 2016, 12:25:41 PM »
So in the case of the other way around, the power supply runs out of available current?
 

Online Bassmann1968

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Re: Ohms Law and Wattage
« Reply #3 on: March 31, 2016, 01:39:03 PM »
Correct.
Armin

PLEASE LIKE EDEN ON FACEBOOK!!!
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WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112

Offline Pantera

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Re: Ohms Law and Wattage
« Reply #4 on: March 31, 2016, 04:16:37 PM »
 :)
Thanks man. That makes perfect sense.
So they conservatively rate the upper watts at the 4 ohm load.
Cool.
 

Offline libexec

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Re: Ohms Law and Wattage
« Reply #5 on: April 06, 2016, 07:41:14 AM »
I see this "problemo" with other perspective: the amp puts a constant voltage on its output. And, you know, W = V²/R

So, with more resistance, you get less power.

Am I right on this?

Online Bassmann1968

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Re: Ohms Law and Wattage
« Reply #6 on: April 06, 2016, 05:03:45 PM »
Nothing wrong with that, but if the power of the power supply is at it's limit, you can lower R as much as you want but will not get more W out of the amp, because V will drop.
Armin

PLEASE LIKE EDEN ON FACEBOOK!!!
No schematics available!!! Don't ask for it.
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WTP-Pre,1350,WTX260,WT300/400,WT1000,WTX1000N,NAV,WTDI
D112XLT,D210XST,D410XLT,D810RP,DNS410,DNS112