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Hello,
After a problem here in my studio with a tweeter that blowed during a feedback while I was testing some microphone cables... however Feedback and resonance are the same thing and this is what is important to what i'm going to say.
I opened the tweeter and found the wire burned. Coincidentally i had from previous experiments in the past 0,1mm diameter copper wire and corona dope spray and i decided to try repairing the tweeter for myself. (i have also decided try repairing it because the guy on the repair shop wanted from me 100 euros to repair it)
Well i took a couple of hours to accomplish that because i needed to apply some corona dope to glue the wire on the thin aluminum base... Than wind up the wire very perfectly as to make its inductance to be exactly the same as the inductance of the tweeter that remained alive.
Ok for those who don't know how a tweeter or speaker works, basically it is a a thin membrane glued to a thin aluminum thin foil witch have a coil winded on it witch is placed inside a toroidal magnet. When you apply a signal to the coil it will move in relation to the magnetic field making the membrane to vibrate.
OK... i measured the inductance of the coil without magnet and it were about 3 times bigger than when it was inside the magnet. I think it's because there is some leakage inductance because of the metal witch evolve the magnet. However this is not so important.
The important is that i discovered that there is not only electrical resonance... but also acoustic and mechanical resonance in this world.
Resonance is:
Mechanical resonance is the tendency of a mechanical system to absorb more energy when the frequency of its oscillations (or induced oscillations) matches the system's natural frequency of vibration (its resonance frequency or resonant frequency) than it does at other frequencies. It may cause violent swaying motions and even catastrophic failure in improperly constructed structures including bridges, buildings, and airplanes a phenomenon known as resonance disaster.
Acoustic resonance is the tendency of an acoustic system to absorb more energy when it is forced or driven at a frequency that matches one of its own natural frequencies of vibration (its resonance frequency) than it does at other frequencies. As such, acoustic resonance is a branch of mechanical resonance that is concerned with the mechanical vibrations in the frequency range of human hearing, in other words sound. For humans, hearing is normally limited to frequencies between about 20 Hz and 20,000 Hz (20 kHz)
An acoustically resonant object usually has more than one resonance frequency, especially at harmonics of the strongest resonance. It will easily vibrate at those frequencies, and vibrate less strongly at other frequencies. It will "pick out" its resonance frequency from a complex excitation, such as an impulse or a wideband noise excitation. In effect, it is filtering out all frequencies other than its resonance.
After a problem here in my studio with a tweeter that blowed during a feedback while I was testing some microphone cables... however Feedback and resonance are the same thing and this is what is important to what i'm going to say.
I opened the tweeter and found the wire burned. Coincidentally i had from previous experiments in the past 0,1mm diameter copper wire and corona dope spray and i decided to try repairing the tweeter for myself. (i have also decided try repairing it because the guy on the repair shop wanted from me 100 euros to repair it)
Well i took a couple of hours to accomplish that because i needed to apply some corona dope to glue the wire on the thin aluminum base... Than wind up the wire very perfectly as to make its inductance to be exactly the same as the inductance of the tweeter that remained alive.
Ok for those who don't know how a tweeter or speaker works, basically it is a a thin membrane glued to a thin aluminum thin foil witch have a coil winded on it witch is placed inside a toroidal magnet. When you apply a signal to the coil it will move in relation to the magnetic field making the membrane to vibrate.
OK... i measured the inductance of the coil without magnet and it were about 3 times bigger than when it was inside the magnet. I think it's because there is some leakage inductance because of the metal witch evolve the magnet. However this is not so important.
The important is that i discovered that there is not only electrical resonance... but also acoustic and mechanical resonance in this world.
Resonance is:
Mechanical resonance is the tendency of a mechanical system to absorb more energy when the frequency of its oscillations (or induced oscillations) matches the system's natural frequency of vibration (its resonance frequency or resonant frequency) than it does at other frequencies. It may cause violent swaying motions and even catastrophic failure in improperly constructed structures including bridges, buildings, and airplanes a phenomenon known as resonance disaster.
Acoustic resonance is the tendency of an acoustic system to absorb more energy when it is forced or driven at a frequency that matches one of its own natural frequencies of vibration (its resonance frequency) than it does at other frequencies. As such, acoustic resonance is a branch of mechanical resonance that is concerned with the mechanical vibrations in the frequency range of human hearing, in other words sound. For humans, hearing is normally limited to frequencies between about 20 Hz and 20,000 Hz (20 kHz)
An acoustically resonant object usually has more than one resonance frequency, especially at harmonics of the strongest resonance. It will easily vibrate at those frequencies, and vibrate less strongly at other frequencies. It will "pick out" its resonance frequency from a complex excitation, such as an impulse or a wideband noise excitation. In effect, it is filtering out all frequencies other than its resonance.
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