Carbon nanotubes

[captaincheesey 10+ year member]

http://pubs.acs.org/doi/full/10.1021/nl802750z

I know it's an old post I think from back in 08 but I have never seen this posted on here and was wondering what the CA community might have to say about it.

It's an interesting use for it and notice the SPL levels they were getting from it at 3 and 12 watts from the one-layer and four-layer section tests. The applications in car audio could change everything if they can be implemented correctly. Imagine how weight wouldn't be as huge of a factor anymore, and you wouldn't see giant battery banks and stacks upon stacks of amplifiers.

Click to read more...

 

[PioneerSPL1990 10+ year member]

can u condese it more and skimming i didnt see any numbers?

 

[l7runner 10+ year member]

carbon nanotubes are very interesting materials, we study them extensively at my college.

but the SPL levels don't seem to even break 100dB @ 5cm with 3-12 watts. So they don't seem to be any more efficient that your average speaker. Maybe I read the article wrong though.

 

[Plutoman 10+ year member]

carbon nanotubes are very interesting materials, we study them extensively at my college.
but the SPL levels don't seem to even break 100dB @ 5cm with 3-12 watts. So they don't seem to be any more efficient that your average speaker. Maybe I read the article wrong though.

I'm reading through the article at the moment. I think the thing to remember is that these are a few dozen nanometers in width. You could fit hundreds of them there, if I understand this correctly. It's an interesting read, and highly scientific, but informative.

And transparent, flexible, strips that produce sound? The usefulness could be astounding. It operates through the thermo process, the strips don't vibrate. The changes in heat produce the pressure waves. Which means you don't have to deal with any vibrations.

 

[captaincheesey 10+ year member]

can u condese it more and skimming i didnt see any numbers?

You my friend fail and are still one of those ****ing '08ers.

Anyways about the 100db thing, yes at 3-12 watts, but imagine if you threw an average 4 channel at one, let's say 50 watts at 4 ohms. That's a significant difference in power, and if the old saying holds true, for every 3db in increase you have to double the power, well 50 watts is 6 times the amount of 12 watts. Also, since they are getting that at such a thin amount, imagine something the size and density of your average paper pulp cone. I think it's interesting and it would be cool to see where they go with this. Another article I read said something about stretching it across an LCD screen as the speaker for a TV instead of having to increase the size of the unit to accommodate conventional speakers.

 

[Plutoman 10+ year member]

You my friend fail and are still one of those ****ing '08ers.

Anyways about the 100db thing, yes at 3-12 watts, but imagine if you threw an average 4 channel at one, let's say 50 watts at 4 ohms. That's a significant difference in power, and if the old saying holds true, for every 3db in increase you have to double the power, well 50 watts is 6 times the amount of 12 watts. Also, since they are getting that at such a thin amount, imagine something the size and density of your average paper pulp cone. I think it's interesting and it would be cool to see where they go with this. Another article I read said something about stretching it across an LCD screen as the speaker for a TV instead of having to increase the size of the unit to accommodate conventional speakers.

He has a point - in the graphs shown, for the power with them, they are significantly lower than any CA speakers. But reading more in depth, you can see that the potential is so huge. The frequency response is a fairly linear curve, though, which is strange in a way. You'd have to constantly equalize the top down. You can use hundreds to produce the volume of a dozen speakers.

And they're 80% transparent there, but they can supposedly be made 95% transparent through more complicated processes.

 

[captaincheesey 10+ year member]

He has a point - in the graphs shown, for the power with them, they are significantly lower than any CA speakers. But reading more in depth, you can see that the potential is so huge. The frequency response is a fairly linear curve, though, which is strange in a way. You'd have to constantly equalize the top down. You can use hundreds to produce the volume of a dozen speakers.
And they're 80% transparent there, but they can supposedly be made 95% transparent through more complicated processes.

And also, the impedance is somewhat variable? Because in different tests one was like 1k ohm and the other one it was 8 ohms?

 

[94Mazda626 10+ year member]

You my friend fail and are still one of those ****ing '08ers.

Anyways about the 100db thing, yes at 3-12 watts, but imagine if you threw an average 4 channel at one, let's say 50 watts at 4 ohms. That's a significant difference in power, and if the old saying holds true, for every 3db in increase you have to double the power, well 50 watts is 6 times the amount of 12 watts. Also, since they are getting that at such a thin amount, imagine something the size and density of your average paper pulp cone. I think it's interesting and it would be cool to see where they go with this. Another article I read said something about stretching it across an LCD screen as the speaker for a TV instead of having to increase the size of the unit to accommodate conventional speakers.

Please explain this statement?

using that double the power increases SPL by 3db

3 / 100

6 / 103

12 / 106

24 / 109

48 / 112

 

[KyleBechtold 5,000+ posts]

I'm reading through the article at the moment. I think the thing to remember is that these are a few dozen nanometers in width. You could fit hundreds of them there, if I understand this correctly. It's an interesting read, and highly scientific, but informative.
And transparent, flexible, strips that produce sound? The usefulness could be astounding. It operates through the thermo process, the strips don't vibrate. The changes in heat produce the pressure waves. Which means you don't have to deal with any vibrations.

pressure waves will still cause vibrations.. no vibrations no noise.. whether the actual speaker vibrates or not has nothing to do with it

 

[DidUHearThat? 10+ year member]

LOL @ ca.com 'tards playing scientist.

 

[Plutoman 10+ year member]

pressure waves will still cause vibrations.. no vibrations no noise.. whether the actual speaker vibrates or not has nothing to do with it

Of course. But the vibrations will be due to sound, and in the air, not the actual strips.