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Old 24th February 2010, 04:24 PM   #21
Bigun is offline Bigun  Canada
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why don't they just encourage the use of efficient speakers, it seem silly even thinking about trying address power dissipation without addressing the 'elephant in the room'.
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Old 24th February 2010, 05:16 PM   #22
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And if you add up ALL the power consumed by ALL the Class-A audio amplifiers all over the world, what sort of trivial number do you get?
You cold probablly offset it for several years by cancelling one intercontinental jet aircraft flight.
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Old 24th February 2010, 05:41 PM   #23
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It wouldn't surprise me in the least

EU Plasma TV ban

The EU has already banned incandescent lightbulbs of 60W & above. Halogen bulbs are ok for now though, in a few years they'll be stuffing LED lightbulbs down our neck. They'll probably ban energy saving fluorescents due to the mercury used in the phosphors

You can't win, they'll be out to get you...
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Old 24th February 2010, 05:47 PM   #24
wg_ski is offline wg_ski  United States
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Originally Posted by Bigun View Post
why don't they just encourage the use of efficient speakers, it seem silly even thinking about trying address power dissipation without addressing the 'elephant in the room'.
Because efficient speakers ARE the elephant in the room. 98dB/W at 30 Hz is the size of your fridge. And no, having 98dB/W satellites that consume 20mW audio power and a 78dB/W "sub" that consumes 500W to produce bass in a half cubic foot box does not count as an "efficient" speaker. That's cheating and consumes more total power than 90dB/W full range monkey coffins.
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Old 24th February 2010, 05:49 PM   #25
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Originally Posted by nightanole View Post
Power factor is the offset of current vs voltage in power supply due to either a inductive or capacitive load. Most smps have a power factor of 0.5. So they suck 1amp, but the generator has to supply 2amps, and they can only bill you for 1amp. The generator supplies volts-amps but they can only bill you for watts.
To clarify this a bit, the SMPS takes 2 A in, but only takes 1 A worth of energy (which is what you pay for), essentially "returning" the other half back to the network. This means that the utility company has to pay for the transmission losses for 2 A. They don't actually produce twice the amount of power.

Regarding the subject of idling class A, I also think that this is likely a conflation of the standby issue. The power consumption of class A power amps is really a non-issue. General market interests are already driving towards high-efficiency amps in the low- and middle-end simply because they are a lot less expensive. Most people just don't care how it works or how it sounds as long as there's something resembling music coming out of their little plastic boxes (not that well made class D amps are that bad). The power consumed by all the class A amps in the world is just a drop in the ocean.

Last edited by Corben; 24th February 2010 at 05:53 PM.
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Old 24th February 2010, 06:34 PM   #26
wahab is online now wahab  Algeria
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Originally Posted by Steerpike View Post
And if you add up ALL the power consumed by ALL the Class-A audio amplifiers all over the world, what sort of trivial number do you get?
You cold probablly offset it for several years by cancelling one intercontinental jet aircraft flight.

About 1 nuclear reactor/5,000,000 households....
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Old 24th February 2010, 07:14 PM   #27
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And if you add up ALL the power consumed by ALL the Class-A audio amplifiers all over the world, what sort of trivial number do you get?
You cold probablly offset it for several years by cancelling one intercontinental jet aircraft flight.
And to think nearly 2000 delegates took to the air to attend the Copenhagen Climate Conference. That'd cover all the Class A amplifiers until the end of mankind many times over.
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Old 24th February 2010, 07:43 PM   #28
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About 1 nuclear reactor/5,000,000 households....
436 nuclear plants world wide produce 370,326 MW total. This means that 5 million amps running 8 hours a day at 510W will be powered by an average nuclear plant.

Using these two sources (1) (2), I estimate that roughly 20 Boieng 747-400's consume (in flight) the same amount of energy as that one power plant produces. (Same number can be had from here with a little less work.)

I have no idea how many class A amps are out there in frequent active use, but 5 million seems a bit high (almost 1/1000 would have one) and I doubt that they run for 8 hours a day on average. If we take that down to 500 000 amps, 2 hours a day, it would be pretty close to a 747 flying non-stop.
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Old 24th February 2010, 07:48 PM   #29
Magura is offline Magura  Denmark
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Corben,

That's all good, you can even calculate, which makes it near impossible for you, to ever get a job in politics.

Since this has nothing to do with any sort of hard facts, what makes you think that you can apply logic to such a case? Or even worse, math???

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Old 24th February 2010, 08:08 PM   #30
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Since this has nothing to do with any sort of hard facts, what makes you think that you can apply logic to such a case? Or even worse, math???
Well, I just though it would be fun to actually have some numbers. I don't know (or care) if it'll affect anyones opinions, but having an idea of the ballpark can't hurt.
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