## Calculate Res - Lces - Cmes for the electrical speaker model

 The speaker equivalent circuit is the actual core of the theories crafted by Thiele and Small. Every component of a speaker can be “transformed” into an electrical component, to form a circuit that acts exactly the same as the speaker (electrically). Now imagine that you get different resistors, inductors and capacitors, and arrange them in such a way, that when you measure the impedance of this newly formed circuit, it’s exactly the same as the impedance of the speaker. A similar thing happens when you place the speaker in a box. Additional components are added to the circuit. That is how Thiele and Small manage to predict the behavior of enclosures. Re = DC resistance of a loudspeaker transducer, measured in ohms. Le = Voice coil inductance measured in millihenries (mH) (measured at 1 kHz). fs = is the free-air resonant frequency of a speaker Bl = The product of magnet field strength in the voice coil gap and the length of wire in the magnetic field, in tesla-metres (T·m). Mms = Mass of the diaphragm/coil, including acoustic load, in grams. Mass of the diaphragm/coil alone is known as Mmd Cms = Compliance of the driver's suspension, in metres per newton (the reciprocal of its 'stiffness'). Rms = The mechanical resistance of a driver's suspension (i.e., 'lossiness') in N·s/m Cmes = Cone Suspension Lces = Cone mass Res = Cone Losses

 Voice Coil DC Resistance, Re [Ω] = Voice Coil Inductance, Le [mH] = Resonance Frequency, Fs [Hz] = Motor Force Factor, Bl [Tm] = Moving Mass, Mms [g] = Compliance, Cms [mm/N] = Mechanical Resistance, Rms [kg/s] =

 You will need the following tools: LTSPICE: http://www.linear.com/designtools/software/ Speaker datasheet or own measurements

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