L_E (L_e/(sin(n_e*pi/2)))*(acpr.omega[s/rad])^(n_e-1) Voice coil inductance (freq. dependent) Rp_E (L_e/(cos(n_e*pi/2)))*(acpr.omega[s/rad])^(n_e)[ohm/H] Resistance (losses in magnetic system) u_D cir.L2_i[m/s/A] Membrane velocity F_D -intop((down(p)-up(p))*nz) Axial pressure force P_AR intop(up(acpr.Ir)*nr+up(acpr.Iz)*nz) Acoustic radiated power P_E 0.5*realdot(V0,cir.R1_i) Electric input power (rms) eta P_AR/P_E Driver efficiency Zfar s*5[m]+(1-s)*(Rair+Rpml) z-coordinate (from Rair+Rpml to 5[m]) Lp 10*log10(0.5*pfar(0,1)*conj(pfar(0,1))[Pa^2]/acpr.pref_SPL^2) Sound pressure level (1m in front of the speaker)