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Old 13th June 2007, 11:53 PM   #21
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Quote:
Originally posted by darkfenriz
atmosferic pressure, the "DC" for all music, which is AC
Aaah! I thought you were just being crazy but ............
I guess you're saying that air pressure,fairly constant and therefore somehow analogous to D.C., is being modulated by the movement of the diaphragm/cone/panel etc. (Music).

Right?
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Old 14th June 2007, 12:50 AM   #22
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Thought experiment:

Imagine you have an old pendulum clock. When the pendulum is swinging, at any speed, (frequency), then then you can use it to tell the time. No matter what speed it swings, you can use different gears to make it work. However if you stop the pendulum swinging, no mechanism that you can attach to the clock will make it tell the time. Therefore the concept of zero Hz is meaningless.
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Old 14th June 2007, 01:12 AM   #23
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Quote:
Originally posted by pinkmouse
......Therefore the concept of zero Hz is meaningless.
I understand what you're saying and I agree that zero Hz is mathematically meaningless until I get to daydreaming .................

A speaker/pendulum continually reduces it's frequency ..... 10Hz .... 1Hz ..... 0.1Hz .... 0.000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000 0000000000000000001Hz

What comes next? Yes, I do know, but it's interesting and you get what I mean! Surely this number is more than a reasonably accurate representaion of 0Hz.

To me, it's like trying to comprehend all the stars in the universe ..... or .... the universe.

I think I'll just try to counteract tonight's insomnia by accepting that 0 Hz = Stop.
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Old 14th June 2007, 01:21 AM   #24
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Quote:
Originally posted by Sonusthree
...What comes next?...

That's what we have calculus for.

Read up on Zeno's paradoxes, particularly the arrow in flight - that's a similar case.
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Old 14th June 2007, 07:20 AM   #25
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Quote:
Since DC is electrons flowing continuously in one direction, wouldn't it push the cone out (or pull it in depending on polarity) and just leave it there?
Only a AC current creates a electromagnetic field. A DC current does not.
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Old 14th June 2007, 09:16 AM   #26
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Quote:
Originally posted by Keruskerfuerst
Only a AC current creates a electromagnetic field. A DC current does not.
How come I can make an electromagnet out of an old nail, a coil of wire, and a 9V battery then?
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Old 14th June 2007, 09:31 AM   #27
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Quote:
Originally posted by Keruskerfuerst


Only a AC current creates a electromagnetic field. A DC current does not.

Quote:
Originally posted by pinkmouse


How come I can make an electromagnet out of an old nail, a coil of wire, and a 9V battery then?
is that the difference between a dynamo and an alternator?
one produces DC and the other produces AC (that needs to be rectified).
Both machines depend on electromotive force and electromagnetic field.

BTW,
what is chopped DC?
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Old 14th June 2007, 09:51 AM   #28
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Quote:
Originally posted by AndrewT
is that the difference between a dynamo and an alternator?
one produces DC and the other produces AC (that needs to be rectified).
Both machines depend on electromotive force and electromagnetic field.?
To save me the typing, here's the wikipedia reference.

Quote:
BTW, what is chopped DC?
Chopped DC varies between the given voltage and ground, and AC varies in relation to ground, so goes negative as well as positive. At least, that's how I understand it.
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Old 14th June 2007, 07:10 PM   #29
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Quote:
Originally posted by Sonusthree


I understand what you're saying and I agree that zero Hz is mathematically meaningless until I get to daydreaming .................

A speaker/pendulum continually reduces it's frequency ..... 10Hz .... 1Hz ..... 0.1Hz .... 0.000000000000...00000000000001Hz
nah a pendulum of a given length will always swing at the same frequency, regardless of amplitude.

unless of course the amplitude is zero.

high school physics.
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Old 14th June 2007, 09:25 PM   #30
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Quote:
Only a AC current creates a electromagnetic field. A DC current does not.
Try hooking up a battery to a woofer and see what happens...

Then reverse the polarity.
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