# Which method of controlling speaker volume consumes more power? [closed]

2 speakers are playing at same volume from computer. One speaker volume is controlled by software but knob turned to maximum. Another speaker has volume knob set at 75%. Both are playing at same volume. Which method of controlling speaker volume consumes more power?

• Why would you care about the power consumption of the volume control circuit? It'd be more relevant to speculate which speaker was taking more power. This question seems irrelevant and is unanswerable without guesswork. – Andy aka Mar 18 '16 at 8:59

The power dissipated in a 10 kΩ pot with a 1 V line-level signal would be given by $P = \frac {V^2}{R} = \frac {1*2}{10k} = 0.1~mW$. Maybe you could save 0.25 mW by turning the pot up to max and turning the volume down in the computer. Compared with the several watts require for the amplifier it's negligible.