tacomabanga1986 Posted April 2, 2011 Report Share Posted April 2, 2011 it means people go more indepth with trying to find actual power outputs they use a amp meter to measure current draw, a volt meter for power for voltage drop, and a volt meter for speaker outputs to measure the power and then do the arithmetic to find it i just go by ohms law to guesstamate what it might put out like u take the amps fuseing rating and times it by 12.3v or so and it will give u a power output that the amp cannot exceed due to how its fused, i know this aint that accurate and does not mean an amp will do this but it wont do more than this like for my amp for instance, 4 30amp fuses = 120amps of fuseing, then times 12.3v will give u 1476watts, this means my amp is built to not exceed 1476watts with the fuseing its raited, now most amps will do this but its just a guesstamation but this pritty much sums it up, they do this to see an amps output, mostly for spl type stuff, or someone just bored lol the unbolded is a good explanation. OP, keep in mind that the bolded text is unclamped ya, i said that wasnt accurate lol, just was messing around with ohms law a little bit trying to figure some things out, never said that was accurate here's a link to my system 99 toyota tacoma , 2 mtx 8000 1504's in a sealed downfire , 1000w memphis amp here's a link to my other system my 90 geo prizm test car heres a thread i got of new songs u can dl that are legal = Some Good Bangage/you Can Dl These Free And Legit Link to comment Share on other sites More sharing options...
tacomabanga1986 Posted April 2, 2011 Report Share Posted April 2, 2011 like for my amp for instance, 4 30amp fuses = 120amps of fuseing, then times 12.3v will give u 1476watts, this means my amp is built to not exceed 1476watts with the fuseing its raited, now most amps will do this but its just a guesstamation thats input power though, not output. the amplifier may be 50 - 80% efficient, depending on what type of amp it is, so a 1500watt input may only mean a possible 800 - 1200 watt output. ohms law means nothing when knowing the power output of an amplifier as a speaker is a reactive load. meaning, your speaker may be "4 ohms" but in reality, its impedance will vary from 4 ohms to 10 ohm, 20 ohm, or possibly even more! depending on frequency. this is why people run their amplifiers at half an ohm, quarter an ohm, or whatever, my subs are rising from 1 ohm to about 2- 3 ohm depending on the frequency, with a peak of about 10 ohms at the boxes resonant frequency, which is about 28Hz. ya, a speakers ohm is the load it has at a resting point, but once it starts moveing it goes all over the place lol ive seen someone run my amp @ .5ohms but its stable @ 1, i would try it but i dont want to haha, could u see steve doing this in the hoe? a clamp meter the size of a 50gal trash can lol how do u check ur alts amp output? i knew how befor but forgot, i wanna see acually what mine is doing without taking it off the truck, i know its around 70amps @ idle or 2krpm but prolly not more than that cause with 1000wrms and 2 batteries i get voltage drop like a bitch sometimes with big 3 n all, and ive seen people run 2k+ off stock alt n battery with no problems anyways im not a know it all, i just like to set back n watch n learn here's a link to my system 99 toyota tacoma , 2 mtx 8000 1504's in a sealed downfire , 1000w memphis amp here's a link to my other system my 90 geo prizm test car heres a thread i got of new songs u can dl that are legal = Some Good Bangage/you Can Dl These Free And Legit Link to comment Share on other sites More sharing options...
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