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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Does magnet size matter? posted by Raymond Leggs on June 1, 2012 at 20:38:09:
The size of the magnet influences the flux density or strength of the magnetic field and hence the potential amount of acceleration that can be imparted to the voice coil/diaphragm assembly. Larger magnets do provide the opportunity for increased overall efficiency but as others have suggested - it is but one factor in the total outcome. The well known damped harmonic oscillator equation provides cues as to what is going on:
d^2x/dt^2 + 2(damping coefficient)(resonant angular frequency)(dx/dt) +(angular frequency)^2(x) = 0
The first component represents the acceleration (force available to accelerate the moving mass of the coil/diaphragm). As one can see if this value is increased, the resonant frequency increases. Superimposed on this equation, in the case of an acoustic transducer, would be the cyclical acoustical loading of the diaphragm which varies essentially with the degree of acoustical coupling the diaphragm is capable of over a range of frequencies.
The bottom line of all of this is that larger magnets and stronger magnetic fields are potential improvements provided that the moving mass, suspension compliance, and damping of the system are properly balanced with the force applied by the combination of applied voltage and magnetic field to produce a loudspeaker that is neither overdamped nor underdamped. Additionally, as I noted in an earlier thread - more powerful voice coil gap field strengths reduce the amount of voice coil current needed to produce diaphragm deflection and thus reduce magnetic field fluctuations that cause distortion - particularly at higher frequencies.
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Follow Ups
- RE: Does magnet size matter? - villastrangiato 08:07:45 06/03/12 (0)
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