An interesting observation. I do not doubt it. Yet, we apprently can perceptually distinghish very slight changes in "at your ear" reproduction, even while the reproduction little resembles the original source waveform.
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Wrong analogy - we're talking amplifier Class, not manufacturer. If you want a car analogy you need to talk technological differences, e.g. petrol vs diesel vs electric.
thank you for comforting me...
I agree with the inefficiency of the speaker, in recent years we have solved the strength, weight (as neodymium), and little efficiency. I think it is inherent in the concept which we can not fly... expect a new invention hehe!
Best regards
Roberto
Efficient speakers are available today, but people don't like their large size; Hoffman had something to say on this topic. Anyhow, if you want efficient speakers, you can have them, but they need space.
It is an approach that removes many variables, makes the measurements simpler, repeatable and allows comparisons between systems. But nobody listens in such an environment - it's debatable as to how relevant such measurement data is to how your system will sound in your house.
+1
you should live in Europe for a while
in my apartment, even medium sized monitors are elephants in the living room 
you should live in Europe for a while
Speaking of which. The EU is ready with a new law that will ban all consumer electronics above a certain power rating that does not live up to "gold" efficiency standards, ie. minimum 80% efficiency under load. Probably will also be some requirement on maximum standby power draw as well.
It seems the EU is going to rescue us after all. We all have to get class D amps
they're preparing to ban p0rn too. I'm not kidding.
'Attempt to ban porn' discovered in EU report - Europe - World - The Independent
'Attempt to ban porn' discovered in EU report - Europe - World - The Independent
That's just a resolution. In principle merely a statement of intent that may or may not a some later stage be in some form or another introduced in a law proposal. Or it may be abandoned altogether.
The law of consumer electronics efficiency is a real law proposal though.
Speaking of which. The EU is ready with a new law that will ban all consumer electronics above a certain power rating that does not live up to "gold" efficiency standards, ie. minimum 80% efficiency under load. Probably will also be some requirement on maximum standby power draw as well.
It seems the EU is going to rescue us after all. We all have to get class D amps
Here's the lunacy, permuted: yet, they would allow people the use of electric stoves, ovens, and even - grandfathered in? - in-floor electric heating. So... let's see ... its OK to make heat, for heating, but its not OK to make heat, more than 79.9999% ... for some other purpose? In the Autumn, Winter and Spring, that 'waste' heat certainly isn't 'wasted'. It lowers, however marginally, the heat needed to make for ... heating.
As an example, I live in an apartment that was built in the "Soon Nuclear Electricity will make it too cheap to meter" era, so it is entirely electrically heated. No gas, no oil, no coal, no wood-fires, no smoke stacks or chimneys. My landlord ('cuz of complaints from other goody-two-shoes types) has complained that I'm wasting power, due to leaving nice big 100+ watt lights lit while I'm gone. Uh... what? If I left the HEATER on (which I usually do), would there be a complaint? Nah... no-see-um == no-problema.
CHARGE FOR THE POWER damnit! If I use too much for YOUR tastes, take care of that through taxation and the open-market policy of "if you can afford it, then you can use it". I know to the poor socialist-minded Europeanos, this is a bit much to bear, since everyone is supposed to line up like sheep and legislate themselves into proper, righteous, Politically Cleansed behavior. And, since life is boring for the great majority of chronically barely poverished apparatchiks, reporting on neighbor's transgressions becomes the hobby of the masses.
Which of course is absolutely antithetical to at least American, and I hold, many other systems of Democracy.
Sure, we shouldn't squander resources, but the checks-and-balances on that is only as far away as the Electric Bill. Or ... just make more power. WTF. The French got it right, 40 years ago. Make tons of power, and make it nearly free.
GoatGuy
Wow. Whoever said such lunacy? Nuclear energy in it's present form is and has always been the most expensive per KWh produced. The only viability it has ever had is that it doesn't burn fossil fuels and thereby not releasing CO2. It still has the problem of it producing vast amounts of water vapour which is far worse than CO2, not to mention the still unsolved waste problem.
Saturnus,
What you don't understand is this was the future that we were promised on television by GE and a few others back in the late 50's and even into the 60's. That we would have unlimited amounts of electrical power and that we could do away with coal and oil and perhaps keep hydro-electrical power as a supplement to the nuclear age. Waste product was not mentioned, let alone even understood by these purveyors of the all electric home. We were supposed to have flying cars by now, monorails for transportation and people movers instead of sidewalks. You only had to go to Disneyland to see it all, it was an entire exhibit of our future with cars traveling in closed tubes and all the rest. Leave your front door and fly your car to work. I completely understand where GoatGuy is coming from, we were sold a bill of goods. Now those who still have a house built for the days of cheap power are S..t out of luck, try and fix that now! But I still can't understand why we don't have monorails in all the major cities and between them as well. Just put them right down the middle of all our freeways above the traffic.
ps. How can we allow any new home to be built without solar power as a requirement, it would add little to the original cost to build and would solve a lot of the rising cost of power. but that is much to logical to require.
What you don't understand is this was the future that we were promised on television by GE and a few others back in the late 50's and even into the 60's. That we would have unlimited amounts of electrical power and that we could do away with coal and oil and perhaps keep hydro-electrical power as a supplement to the nuclear age. Waste product was not mentioned, let alone even understood by these purveyors of the all electric home. We were supposed to have flying cars by now, monorails for transportation and people movers instead of sidewalks. You only had to go to Disneyland to see it all, it was an entire exhibit of our future with cars traveling in closed tubes and all the rest. Leave your front door and fly your car to work. I completely understand where GoatGuy is coming from, we were sold a bill of goods. Now those who still have a house built for the days of cheap power are S..t out of luck, try and fix that now! But I still can't understand why we don't have monorails in all the major cities and between them as well. Just put them right down the middle of all our freeways above the traffic.
ps. How can we allow any new home to be built without solar power as a requirement, it would add little to the original cost to build and would solve a lot of the rising cost of power. but that is much to logical to require.
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Come on Roberto,
this is a little bit to much of enthusiastic promotion.
A regulated PSU is nothing new.
Attached a screen shot of the load regulation of an older smps with PD control loop, which I designed for a friend.
The screen shot is showing the output response of the 59V rail when a load step of 900W (15.5Ω from +59V to -59V) is applied. The rail drops about 0.5V and that's no rocket science, just straight forward engineering with a SG3525 and using the integrated gain stage plus some passives for proper loop gain.
White trace is the 59V rail, measurement DC coupled: 20V / Grid
Red trace is the AC component of 59V rail: 200mV / Grid
Time base: 1ms / Grid
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you should live in Europe for a while
Actually, I'm English by birth, moved to Canada around age 30. So I'm familiar with small Victorian houses. And I'd say in such rooms you don't need the same volume as in a larger house and there are limits to bass that can be experienced in a smaller room too. I'd argue that you can use smaller less sensitive speakers and less powerful amplifiers too.
For the Nordic countries, and for Canada, it's darn cold in Winter. A Class A or AB amplifier for the winter isn't necessarily a bad thing. I plan something along these lines - I am thinking of building my own Class D amp for use in the summer.
Rick
Why not just get LEDs instead they use under half the power of CFL and have the same performance, yes, with natural warm light as incandescent light bulbs? Most manufacturers even guarantee 20 to 30 years lifetime.
Victorian houses? how about Eastern block apartments?
when I used to own the FW F4, the heat produced during the summer days (no AC) was noticeable.
Hi Choco,
In this thread I was talking about recognition of a sound (musical instrument) and relative error that can result when we use unregulated psu or smps.
Audiophiles are familiar with the sound of an amplifier when the voltage of the psu does not take well. (slips, causing a soft instrument as bass etc).
Mr.Push jumping with another topic I treated on another thread and never completed, in reference to the slew rate.
The DPS-500 is a commercial product specifically for audio amplifier.
I do not know if you've measured smps on market.but would be important to see if it has all the requirements, considering the speed of response.
1) because it is fast, you have to see the behavior of the two rail (as When Work on amplifier). for this, can be used a dynamic load (this is equal to a fast mosfet amplifier).
2) it is important to see the behavior of both the rail, when one is under load (burst) and vice versa. a problem is the reset time on the rail unloaded.
3) under burst check the hf component on the supply rails.
4) EMI / RFI induced / conduct.
5) stability, vs. load
6) stability, vs. ac line
very simple and wrong, is a static measure of resistive load, especially fixed rail on both simultaneously.
These 6 measuring points(all) are important because they reflect on the development strategy that has been chosen.
The DPS-500, responds perfectly to these 6 points.
I can assure you it was not easy.
regards
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