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There are number of interrelated factors that must be considered in design of an effective transducer for converting electrical energy into airborne acoustic energy. These include electro-acoustic efficiency, uniformity of frequency response, linearity of amplitude response, transient response, power handling capacity, portability, durability and cost. Direct-radiator or dynamic loudspeaker and the horn loudspeaker are commonly used for the radiation of acoustic energy into air. In practice direct-radiator loudspeakers are designed targeting the range of frequency in which the radiator is going to implement i. e. woofer, tweeter, squawker or full range loudspeaker. Together with the frequency range, electro-acoustic efficiency of radiator has prime importance while working with the radiators. Main objective of our work is to provide engineers with specific design parameter ranges to manipulate efficiency of direct radiator loudspeaker. A set of two independent algorithms concurrently with a set of ready-reckoner generating functions that compute appropriate set of parameters, is offered. Parameters in pairs are employed to optimize the efficiency of direct radiator loudspeaker. The parameter viz. diaphragm stiffness, transformation factor and moving mass of voice coil are optimized varying combinations to get higher efficiency. Different functions are presented to achieve efficiency through: a) transformation factor at varying diaphragm stiffness and constant moving mass of voice coil b) moving mass of voice coil at varying diaphragm stiffness and constant transformation factor. Characteristics of above functions are examined vis-à-vis change in efficiency with pairs of concurrent parameters: x) transformation factor and diaphragm stiffness y) moving mass of voice coil and diaphragm stiffness. Also characteristics of above functions (a) and (b) are examined vis-à-vis change in efficiency with change in frequency (with repeated algorithms) and using statistical methods. Data obtained by simulation is fitted with appropriate polynomials. Coefficients of polynomials are compared and profiles are obtained over the above range of parameters. Efficiency of direct radiator loudspeaker and the mechanical impedance (Zm) are examined with range of frequencies using pseudo random number generator methods (MCG- Multiplicative-Congruential Generator and MID square method). Main desirable feature of pseudo RNG is its reproducibility. Curves are plotted and fitted with appropriate polynomials. Coefficients of the polynomials are compared to get another set of profiles. Random number generator methods are used to get more near reality.
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