Must say, a nostalgic moment now and then does sound rather tempting.
Can Polypropylene pants be substituted ?
(hang on, I'm even thinking special effects with blocks of styrofoam, the beginnings of an RJ career)
Ray, you really need to find a more gullible audience (giving you the benefit of the doubt that you know that you're talking nonsense rather than being ignorant about the basics of electrodynamic driver operation).
I must admit that there's something deliciously meta about someone peddling snake oil in this thread. 😀
I must admit that there's something deliciously meta about someone peddling snake oil in this thread. 😀
Couldn't say. I am unfamiliar with them. I am, however, familiar with the things Ray makes claims about, and not only are the claims total nonsense, he doesn't even make the slightest attempt to present any actual data or evidence in support of them (perhaps for the obvious reason that he can't).
This is great stuff! I thought my system sounded pants back in the 80s, because it WAS pants.
Now I wonder if it could have been due to all the nylon sheets mum bought....... nah it was pants!
Those were the days, you could 'hear' someone taking off a nylon shirt in the next room by the crackles coming through your radio.
Now I wonder if it could have been due to all the nylon sheets mum bought....... nah it was pants!
Those were the days, you could 'hear' someone taking off a nylon shirt in the next room by the crackles coming through your radio.
In any case, compared to Ray does not understand this and keep talking nonsenses, his speakers were playing quite well for me.
Actually Steve, SloPro only shoots up to 120 FPS (on some cameras) but it simulates higher frame rates.
I suppose that Ray is talking about overshoot, which is certainly possible.
What if the DC is brought up very slowly on an ordinary driver? Will it still not go to its intended position?
I suppose that Ray is talking about overshoot, which is certainly possible.
What if the DC is brought up very slowly on an ordinary driver? Will it still not go to its intended position?
Thanks, Pano.
Oh, and I went back and read the original claims made by Ray that started this. I should have known better. 😀
se
Oh, and I went back and read the original claims made by Ray that started this. I should have known better. 😀
se
As a lad I used to strip down old valve radios sometimes and was astonished when I opened one up and found it had no fixed magnet in it's speaker, it had an electromagnet! I thought that must cause noise. I stuck at it until I got it working and sure enough it reproduced BBC Radio Scotland AND an annoying 50Hz hum.
It amazed me that they could find a buyer for set like that. Has anyone else ever heard this because I had not before or since come across such a strange thing. Mind you I had not come across electrostatic speakers either at that point and they still seem like a strange concept to me.
Scratch that, I just came across these - http://www.grande-utopia-em.com/en/technologies/em.php
You learn something new everyday
It amazed me that they could find a buyer for set like that. Has anyone else ever heard this because I had not before or since come across such a strange thing. Mind you I had not come across electrostatic speakers either at that point and they still seem like a strange concept to me.
Scratch that, I just came across these - http://www.grande-utopia-em.com/en/technologies/em.php
You learn something new everyday
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Electromagnet speakers were once common. Decent permanent magnets at a reasonable price came along later. A little hum was accepted as normal. If the hum is too great then there is a fault which needs fixing. In many cases the speaker field coil doubled as HT smoothing choke.
We now have in this thread claims of speakers which 'work' down to DC - presumably there is an airlock to enter the music room? And should anybody mention the high-pass acoustic filter formed by the speaker size - that means that (a bit like the Chu-Wheeler limit for radio antennas) you can't have both near-DC and efficiency.
We have alleged electrostatic charges (but with no evidence of accumulated charge offered so far?) on cables affecting audio - despite the fact that in a typical domestic setting charges leak away quite quickly.
Are the True Believers trying to do a reverse Sokal manoeuvre on us? They are exploring at exactly what point of silliness we realise they are just spoofing us.
We now have in this thread claims of speakers which 'work' down to DC - presumably there is an airlock to enter the music room? And should anybody mention the high-pass acoustic filter formed by the speaker size - that means that (a bit like the Chu-Wheeler limit for radio antennas) you can't have both near-DC and efficiency.
We have alleged electrostatic charges (but with no evidence of accumulated charge offered so far?) on cables affecting audio - despite the fact that in a typical domestic setting charges leak away quite quickly.
Are the True Believers trying to do a reverse Sokal manoeuvre on us? They are exploring at exactly what point of silliness we realise they are just spoofing us.
That was common in the early days of radio. The coil was used as the choke for the B+, and is the reason for the hum.
Not so high, no. 0R15 is typical. The drivers have a Qts of about 0.4. I think you know the answer...😀
Ray's problem is with basic Faraday. I'm sure his corrections will be a result of his claimed but yet-to-be published revolutionary reworking of quantum mechanics and electromagnetic theory.
In the meantime: battery turns on, cone moves and stays there, just like the textbooks say.
I might have the last laugh on copper.
Have you seen this? Just look at the cast of characters, Paul Grey personally tutored me in his office in 1970. I found this in the context of some Swiss heiress being bilked out of >$70M by some high tech startup that didn't. The one paper posted is so speculative and so far from something that could have any commercial potential that they must really spin it. Magnetic, conductivity enhanced copper almost by alchemical means. Bybee on steroids.
Continuum Energy Technologies
If these speaker work down to dc I can only hope they work up to at least visable light so as to balance the frequency response.
I'm off topic, as always.
I think this is the most exciting piano music of all time:
John Cage: 4'33'' for piano (1952) - YouTube
It doesn't need a speaker at all.
If we don't count the claps at the end.
I think this is the most exciting piano music of all time:
John Cage: 4'33'' for piano (1952) - YouTube
It doesn't need a speaker at all.
If we don't count the claps at the end.
Actually, as an electromagnetic positioning system, speakers DO 'work' down to DC in the sense that when you apply a DC voltage they obligingly move out until the spring resistance equals the electromotive force, and stay there.
It's just that there isn't much of a sound to be heard then 😉
Jan
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