How can this be?

[SamIam71]

So, I am about to set the gain on a Soundstream TA1.2000D. I am running it at 1Ω, and it should produce 2000Watts. 2000W X 1Ω = 2000 √ = 44Vac.

The same amp presented with a 2Ω load makes 1,300Watts. 1300W X 2Ω = 2600 √ = 51Vac.

Again the same amp at 4Ω makes 700Watts. 700W X 4Ω = 2800 √ = 44Vac.

How is it that the higher the wattage being sent to the subs, the lower the ac voltage produced by the amp?

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[Mass Car Audio 10+ year member]

Most likely the amps are going to be lower at 2 and 4 ohm. You have to remember, P(W) = V(V) × I(A)

 

[Beatin' 10+ year member]

700watts at 4 ohms gives 52.92v

1300watts at 2 ohms gives 51v

2000watts at 1 ohm gives 44.72v

^^^The increase of wattage is not linear. Furthermore, lower resistance means more amperage, less voltage.

500 at 4ohms, 1000 at 2 ohms, and 2000 at 1 ohm all give 44.72v with every doubling of power and halving of resistance.

if power is fixed but resistance is not, for example 2000watts at 4, 2, and 1ohm would give you 89.44v, 63.25v, and 44.72v respectively.