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Post by clausdk on May 19, 2013 21:50:55 GMT
Beyer Dynamic has been bragging about their Tesla headphones for some time, it got me thinking..
How does a more powerfull magnet affect the demands on the amplifier, does it need more umpf to perform, does it need lees umpf to perform, or is there no difference at all ??
What is improved by using a more powerfull magnet ?? and how ??
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solderdude
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Post by solderdude on May 20, 2013 19:53:09 GMT
The Tesla technology, as they call it, is just more magnetic force coming from the magnet.
The voice-coil creates the second magnetic field and the strength of that field depends on the current and number of windings (as well as length of wire) the more magnetic force of the magnet the louder the sound will be when the same voice coil is used. That generated magnetic field repels or attracts the membrane to/from the constant magnetic field of the magnet.
So more magnetic force could be used to increase efficiency this way as the total magnetic force is increased. When we look at the efficiency figures of the Tesla types you might have noticed that efficiency isn't that much higher. The magnetic field isn't even that much more powerful than those of other brands and only twice as high. It is highly likely there are other headphones that have magnetic fields that are even closer in strength.
As stated... the, by the amplifier provided, current AND number of windings (length of wire) is also a factor as is the width of the magnetic gap where the voice-coil resides in. Simply put, the thicker those wires (needed for low impedance headphones) the heavier the voice coil the harder it will be to make it move rapidly (high frequencies). You can use thinner wires which lowers the maximum power rating to make it faster but still will require the same amount of windings. However, if you have a stronger magnet you do not need as much windings any more to reach the same amount of 'automotive force' and thus Sound Pressure Level. Less windings equals less weight means the membrane can move faster and thus reach higher frequencies.
As the efficiency and impedance of Tesla types is about the same as those with 'normal' neodynium magnets (that are also quite strong !) and the impedance is as well, the demands on the amplifier are the same.
Beyer does 'cash' on it as if it were a revelation which it is not really. Except for the T5P and DT1350 all the Teslas show excessive highs which creates the illusion of being highly detailed and Beyer likes everyone to think this sense of 'more air' is due to the Tesla technology which is only partly true so no lie.
In short: a higher magnetic flux in the voice-coil area can be used to either increase efficiency or lower the mass of the voice-coil thereby increasing the frequency range and 'speed'.
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