###### Abstract  
In this work, microspeaker frequency response was determined based on measurement and simulation. The vents after the rear chamber of the microspeaker were covered with ventilation cloths. Two types of ventilation cloths (acoustic cloths) are commonly used in electroacoustic products, non-woven and woven. Non-woven cloths (5 nos.) consist of irregular meshes and woven cloths (5 nos.) consist of regular meshes. The equivalent circuit model of the microspeaker was formulated by considering five types each of non-woven and woven ventilation cloths. The acoustic properties of the ventilation cloths were estimated from the measured frequency response of the microspeaker and by subsequent use of particle swarm optimization algorithm. Estimated value of the acoustic impedances of the ventilation cloths were used in an equivalent circuit model of the microspeaker for the simulated frequency responses and subsequently compared with the anechoic chamber measurements. Based on the results, the equivalent circuit adequately simulated the measured frequency response of the microspeaker and the estimations of the acoustic impedances of the ventilation cloths were in good agreement with the measured frequency responses of the microspeaker. a pacs: 12.30.-s, 12.  
been suggested for high fidelity sound reproduction [4; 5; 6]. In a significant contribution, [PERSON] [7; 8; 9; 10; 11; 12] made a significant contribution to this field by elaborating on loudspeaker performance in closed and vented boxes. An equivalent circuit method (ECM) for portable multimedia loudspeaker was discussed by [PERSON] et al. [13]. Moreover, [PERSON] et al. published an extensive report on the microspeker design and development [14; 15; 16; 17]. Acoustic analysis and design of a miniature mobile phone loudspeaker (microspeker) were carried out by [PERSON] et al. [18; 19] using an ECM and finite element method (FEM). Electroacoustic simulation and experimentation were conducted on cellular phone microspeker have been performed by [PERSON] et al. [20]. To improve the overall sound pressure level (SPL) performance over the mid-frequency spectrum for a microspeker investigated by [PERSON] et al. [21] analyzed a few key design parameters in 2008. In 2003, [PERSON] and [PERSON] [22] attempted to identify the acoustical characteristics (effects of entrapped air pocket, power consumption of ultrasound horn, transmitted acoustic pressure amplitude, structural and hydrodynamic characteristics, and acoustic impedance) of textile materials using precision woven monofilament fabrics as a model textile. In 2013, [PERSON] et al. [23] discovered the influence of anisotropy in open-cell porous materials on the vibroacoustic response. [PERSON] [24] extensively documented on acoustic textiles for home wall panels and demonstrated that low-density textile materials are disadvantageous for the sound diffusion. In addition, textiles may be either acoustically absorbent or transparent, depending on the textile build up. The textile structure includes small air pockets that could affect the acoustic properties. Additionally, textiles can be non-woven, woven, or knitted and are normally not homogenous. Various methods are used to make acoustic textiles. In 2013, [PERSON] and [PERSON] [25] utilized an acoustic grille for the loudspeaker cabinet. [PERSON] et al. [26] have tuned the acoustic impedance of porous materials used in an insert earphone for SPL response based on ECM modeling and measurements to validates and understand the effect of acoustic porous material in 2012. In another study, [PERSON] et al. [27] have investigated the acoustic parameters (air permeability, reflection coefficient, and acoustic impedance) of acoustic cloth used in electroacoustic products in 2014. [PERSON] [28] conducted measurements and modeling of circumaural headphones for a desktop computer speaker to investigate the correlation between the measurement and modeling.