The content of my wallet tends to reach my cerebral content.
(Asymptotically. I hope there will always be money for a morning coffee and a late beer)
George
If you want to talk instantaneous power then the fundamental at peak has 160% of the square wave power. Does that mean that everything else sums to -60%? Instantaneous power is not a useful measure.wahab said:
Not at all. As I said, if heat is the only issue then you can use a 1W amplifier for 1% of the time for 100W peaks. I don't believe that heat is the only issue, and implied as much.
Ah! The 'unbelievers are poor' claim. I guess that is a change from 'the unbelievers are deaf' or 'the unbelievers are (gasp!) engineers'. Is audio the only branch of engineering where "engineer" is used as an insult?john curl said:
Bill, you are right and this is known to work. It delivers more undistorted SPL than 850 Watts over a conventional analog crossover. To compare peak SPL, you should add voltages, not watts.
Wahab, your premise is still that sub ms rail to rail peaks exist in music. From experience and from what I can find on the subject, that is just not true.
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For the wallet (horizontal axis) to safety helmet (calipers inches/$ vertical) size relationship, I assume a Gaussian distribution.
Left of the optimum, people assume to be able to spend more than their head size.
On the right side of the bell curve maximum, folks believe to have a skull larger than life.
So instantaneaous amplitude is not important as well...??.
There s a bank of amplitude that is formed if a low amplitude amp is not stressed for some time..?.
That s how some people think here but curiously they apply this logic to amplitude, since a lot of amplitude time a low duty rate is equal to a low power they conclude that a low power (hence low amplitude) amplifier is enough...
In a 1ms rising ramp the contribution of the fundamental is extremely low since her sine has very low value at t = 0.001s but even this small contribution is dispatched to the tweeter, because what the filter see is a dV/dT at this moment and its time constant "tell him" that he must be almost a short when the voltage swing as fast.
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The average power for a tweeter amp may well be smaller than for other bands, but you really don't want to clip peaks.
It reminds me of Don Keele's tests with teeny transducers at very low duty cycles. I have forgotten exactly how much peak power he managed before obvious signs of the parts really falling apart, but it was a bunch. Of course if sustained they would have incinerated swiftly.
Unfortunately it is a design challenge to have a peak voltage capability of, say, a few hundred volts, while preserving efficiency and having a "plant model" of the transducer in a system to monitor self-heating and engage protection.
It reminds me of Don Keele's tests with teeny transducers at very low duty cycles. I have forgotten exactly how much peak power he managed before obvious signs of the parts really falling apart, but it was a bunch. Of course if sustained they would have incinerated swiftly.
Unfortunately it is a design challenge to have a peak voltage capability of, say, a few hundred volts, while preserving efficiency and having a "plant model" of the transducer in a system to monitor self-heating and engage protection.
Well, not so much, because they are mixed for a modest dynamic range. However the realism attendant on a more accurate recording can be quite striking.
Jacco,
I was thinking about changing the power cord on my refrigerator,
Hmmmm, I wonder if it effects the quality of the frozen pictures of the components you want enhanced.
George, you must be a 0.05%er, then.
I don't know why you condescend yourself with us lot, haha.Life without the latter(s) isn't worth living.
(Fingers only uncurled from my coffee mug long enough to deliver this message.
)
Well, right, but there are a few good impulses in there. Came to mind as something that might have quite a demand couple ms of HF content.
Considering that most dome tweeters have efficiency over 91db and some as high as 96db for one watt who would need a 100 watt amp to drive them for any reasonable home use? What is the power required to play a piano at a reasonable rate for the widest dynamic range, what is truly required to reach perhaps a max of 110db in a home for a piano? Perhaps 50 watts with the 91db dome tweeter?
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