Determining Watts at ohms


Unregistered guest
At the risk of sounding overly ignorant..:-)
Can someone point out the method of determining X Watts at Y ohms?
Eg. If an amp is rated at 100Watts RMS at 2 Ohms, What is the same amp rated at 4 Ohms?

Silver Member
Username: Hdubb

Farmington, Nm Usa

Post Number: 387
Registered: Nov-04
the amp will be at 50 watts rms. the lower the ohms the less resistance which equals more power. thar amp at 1 ohm would have 200 watts going through it. at 3 ohms it would be 75 watts. 4ohms is half of 2 and 2 is half of 1.

Unregistered guest
Ahh...i see.
Thanks Hunter.

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 7404
Registered: Dec-03
theoretically, not accounting for efficiency and losses to heat and such, half the resistance would be twice the power output.

8 ohms = 50 watts
4 ohms = 100 watts
2 ohms = 200 watts
1 ohm = 400 watts
you get the idea.

in reality, half the load never quite makes twice the power, because you always lose a bit of power to heat and efficiency depending on the amp. some lose more than others.
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