This round of testing involved researching the amount of wattage drawn by the sound system at various volume levels. Would the battery drain more quickly if the volume was increased, as it would be for an outdoor concert? To measure wattage, I borrowed the Kill a Watt meter displayed below. With the volume settings the same as in the 6-hour voltage experiment, I monitored the watts drawn by the amplifier only, since it is labeled as drawing up to 170 watts. At first, the only setting I manipulated was the amplifier master channel. The results can be seen in the table below. Because the wattage varied little, I tried adjusting the mixer main channel. I moved it from -15 to -7 during Song 2 and the wattage increased to 29. More testing is needed to discover which settings cause the amplifier to draw 170 watts. I also wonder about the number of speakers. Would more speakers and/or monitors increase the wattage?
Amplifier Master Channel Level Watts Drawn by the Amplifier
2 Song 1: 20 watts Song 2: 20 watts
3 Song 1: 20 watts Song 2: 20-21 watts
4 Song 1: 20 watts Song 2: 20-21 watts
5 Song 1: 20-23 watts Song 2: 21-24 watts
Amplifier Master Channel Level Watts Drawn by the Amplifier
2 Song 1: 20 watts Song 2: 20 watts
3 Song 1: 20 watts Song 2: 20-21 watts
4 Song 1: 20 watts Song 2: 20-21 watts
5 Song 1: 20-23 watts Song 2: 21-24 watts