Watts (P) = Volts (V) x Current (I) Assumption V = 115 VAC, I = 1A. P= 115 x 1, P = 115W. 1 Amp @ 115VAC power system = 115W. Assumption V =230VAC (international system) I =1A. P
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Amplifiers exceeding the P1224's 400watt RMS capacity will invariable cause speaker failure. When speakers fail, the amp will follow. The subwoofer's fourohm impedance rating must
http://www.ehow.com/info_12215483_ampgood1200wa...

Watts cannot be calculated from amps alone. The voltage is required...
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1. Familiarize yourself with the quantities involved. To understand the relationship between watts and amps, you will need to understand 3 different units: watts, amps, and volts.
http://www.wikihow.com/ConvertWattstoAmps
