Acoustic line of transmission as sub woofer

The present work designs the elaboration of the model in Pspice V. 9.2, the simulation in the dominion in time and frequency, and the construction of an acoustic Speaker, considering this speaker in the very low frecuency (VLF) as an acoustic line of transmission, to emphasize the low spectrum and to obtain that the speaker apart from reproducing the low media, media and high tones works as sub low, and making a poli spectral resonator and all this in one single acoustic box, which behaves as a line of transmission of fourth wavelength (λ4 ), this to frequencies in between 5 and 70 Hertz.