with a dmm is their any way to see how many watts you sub/speakers are really getting? also i am running alot of fans cus i have a slighly sealed box for my AMPS and they need 12 volts my car runs at like 13.9. is their any way to hook up like aresistor or somthing to the the fans power line to reduce the voltage?
To get close with a digital multimeter set to AC volts. Play you system and put the red wire on + and the black wire on the - from the amp that goes to the subs. Take the reading, if you get 23, Then 23x23=529 now divide 529 by the ohms you are running. 23x23=529 divide 4ohms = 132.25 watts. If you are running two sub you have to divide the 132.25 watts. Each sub will be getting 66 watts.