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Lower wattage supply than max rated load consumption at full power/volume

Lower wattage supply than max rated load consumption at full power/volume
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Suppose, one had 2x 8ohm 75w speakers, and a 3 ohm woofer at 130w, wattage is max rms values for all speakers hooked up to a ddx320.



Now, of course using a fuse and killiwatt to monitor wattage consumption, would it be safe to power the amp at 19v 8a, staying well below 140w total consumption as measured at the killawatt?



How about 16.5v keeping measured wattage consumption below 140w? In both scenarios, the supply is rated for 150w. I assume if you aren't blasting the speakers at full volume, you don't need a super high wattage (in this case ~350w) supply. So long as you are careful not to overload the source.



Obviously, i will be getting a PS rated for full load eventually (350w), but is it possible to power the amp, at well below full power/load, using that low of a voltage/wattage supply, with safety mechanisms (killawatt, fuse) to ensure nothing gets overloaded? IE, don't crank up the volume to levels that max out the power rating of the speakers, and stay below 140w?
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