Why does the amplitude of a loudspeaker cone change with frequency?

  • Thread starter saltrock
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In summary, when the frequency of the AC signal generator is altered, the amplitude of the loud speaker cone changes due to the increase in inductive reactance and the change in magnetic force driving the cone. The mass of the system also plays a role in the reduced amplitude at higher frequencies.
  • #1
saltrock
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AA loud speaker cone is connected to a AC signal genetator.When the frequency of the signal genetor is alterned the amplitude of the cone changes.why?
My working:
As the frequency increases the amplitude decreases because there is less change in the magnetic flux and vice versia...I am a bit confused about the relationship between the amplitude and frequency...

can you please give me some scientific evidence to lead me in the correct path.Any help would highly be appriciated
 
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  • #2
saltrock said:
AA loud speaker cone is connected to a AC signal genetator.When the frequency of the signal genetor is alterned the amplitude of the cone changes.why?
In a loud speaker, current passes through a coil. As the frequency increases, the inductive reactance increases, which opposes current flow (when frequency decreases, reactance decreases, thereby reducing opposition to current). This change in current would have a proportionate change on the magnetic force driving the cone, thereby chaning the amplitude (distance the cone moves per vibration period (T=1/f)).

AM
 
  • #3
Also, mechanical resonances, often represented by Bessel functions, vary (nonlinearly?) the efficiency of the cone surface with repect to frequency.
 
  • #4
Andrew Mason said:
In a loud speaker, current passes through a coil. As the frequency increases, the inductive reactance increases...
That's true to a slight extent, but isn't sufficient to explain the fairly large decrease in cone displacement vs freq. Speakers normally have pretty low reactance at audio frequencies. The main cause of the reduced amplitude is the mass of the system. The mass must be accelerated by the force from the magntic field produced by the coil. If that force changes more quickly, the cone is less able to follow it.
 

1. What is the "Loudspeaker cone problem"?

The "Loudspeaker cone problem" refers to an issue that can occur in loudspeaker systems where the cone, or diaphragm, of the loudspeaker can become damaged or distorted due to excessive sound pressure or improper handling.

2. How does the loudspeaker cone become damaged?

The loudspeaker cone can become damaged due to excessive sound pressure or improper handling. When the volume or power of the sound being played through the loudspeaker is too high, it can cause the cone to vibrate too much and potentially tear or warp. Similarly, mishandling the speaker, such as dropping it or pushing on the cone, can also cause damage.

3. What are the signs of a damaged loudspeaker cone?

Signs of a damaged loudspeaker cone include distortion or changes in the sound quality, rattling or buzzing noises, or visible tears or warping on the cone itself. These issues can affect the overall performance and lifespan of the loudspeaker.

4. Can the loudspeaker cone problem be fixed?

In some cases, the damage to the loudspeaker cone can be repaired, but it depends on the severity of the damage. If the cone is only slightly warped or has a small tear, it may be possible to repair it with specialized tools and materials. However, if the damage is extensive, it may be more cost-effective to replace the entire loudspeaker.

5. How can the loudspeaker cone problem be prevented?

To prevent the loudspeaker cone problem, it is important to use the loudspeaker within its recommended power and volume limits. It is also important to handle the speaker carefully and avoid any impact or pressure on the cone. Regular maintenance and cleaning of the loudspeaker can also help prevent damage and extend its lifespan.

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