how do you figure out

[mazzasec 5,000+ posts]

how much wattage ur speakers are getting? Like ill turn my head unit up to 25 and i dont know how many watts they are getting at that level. I dont wanna blow them but as i turn them up i dont really know how to figure out there limits. My boston sl60's can do 80 and the PG rsd's are known to handle ALOT. How exactly do i figure out how much wattage there are getting according to how loud there playing

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[Etac 10+ year member]

need a dmm... measure the AC voltage

volts = sqroot(ohms * watts)

so say you measure 30 volts and had 4 ohms speakers... you'd have to change the forumla a little but it would be

30 * 30 = 900

900/4 = 225 watts.