a_vent 0.27[mm] "Radius of the vents" a_port 0.715[mm] "Radius of speaker" V0rms 100[mV] "Driver voltage RMS" V0 sqrt(2)*V0rms "Driver voltage" h_max 343[m/s]/fmax/12 "Maximum mesh element length" fmax 20000[Hz] "Maximum frequency" gain 0 "Gain of hearing aid"