i have a big question like forever... ita a about amps, why the sell as non real real power??. example my car amp, says its 1700WATTS, but i can only deliver like 100W of real power, where o they get those 1700W??.
i am thinking they sell feed power and not audio power... or that what i think, but im not sure... does anyone knows something??
I don't know... maybe it sucks 1700watts to create the 100w of audio output?
dave
It's a marketing ploy. The big number is the peak power that a speaker can take for a very very short time. Real output power (google RMS) is usually many times smaller than the big number (if that).
Quote from: davent on August 27, 2014, 03:52:20 PM
I don't know... maybe it sucks 1700watts to create the 100w of audio output?
dave
i was thinking on that, as example, a tube amp, it sucks at 330v 300ma math makes that about(a small 20w amp) 260W on electrical power, adding heaters makes more than 300W, on electrical power to deliver only 20W RMS audio power.
Like muddyfox says it's purely a marketing ploy. The higher numbers usually indicate PMPO which is the maximum total power the speakers can handle. It really is a meaningless number. Always look for the RMS number when buying amps or speakers.
Cheap computer PSU's are also sold using the higher peak wattage number instead of continuous power. Lots of people get caught out and wonder why their PC's don't work properly!
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Quote from: twin1965 on August 27, 2014, 04:54:22 PM
Like muddyfox says it's purely a marketing ploy. The higher numbers usually indicate PMPO which is the maximum total power the speakers can handle. It really is a meaningless number. Always look for the RMS number when buying amps or speakers.
Cheap computer PSU's are also sold using the higher peak wattage number instead of continuous power. Lots of people get caught out and wonder why their PC's don't work properly!
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seems fair, but i was caught by the wonder of, buying power transformer and winding them, since electrical power of a transformer its way more than the audio power rating of the amp wich its intended to use...
as i say before, i got some calculations for 20w amp(tiny terror), and the power transfomer was about 280W of electrical power... but one buys a 20W power transformer for a tube amp, so i was thinking about that relations...
electrical engineers discovered a use for the imaginary number i, the square root of negative one (called j in electrical engineering for some reason). in short they use it to express the indutance or capacitance of a circuit or component. you also use j when expressing "complex" power, where the "real" and "reactive" (imaginary) power both have terms. it's seems like it's possible to inflate the numbers by creating a very high reactive power by conducting the tests under very specific, ideal conditions. they most likely choose very specific frequencies to conduct the test and give an "absolute value" of the power calculations, which isn't that useful of a measurement but gives a larger number and is less intimidating to look at, compared to a complex number.
this isn't fact, but it's one way you could manipulate the numbers!
EEs use i to represent current, hence the switch to j for the unit imaginary number.
Quote from: oldhousescott on August 28, 2014, 02:49:31 AM
EEs use i to represent current, hence the switch to j for the unit imaginary number.
probably not. im not EE, but mechanical E, and the term of j and i, are for the math terms of vectors, where x,y,z are i,j,k, so they split the electical power into vector for better understanding.
Ps, i can only speak normal english and not so well, so, i cant say many of my Engenieers terms to explain what happens to imaginary numbres and the called j and i vectors