Ztrans (intop_mic(p)/intop_mic(1))/intop_in(2*acpr.vz) "Acoustic transfer impedance" Zin intop_in(acpr.Zac)/intop_in(2) "Acoustic input impedance" L0 Labs-Lref "Microphone sound pressure level (normalized)" Labs 20*log10(abs(intop_mic(p)/intop_mic(1[Pa])))[dB] "Absolute level" Lref with(15,Labs) "Reference level at 500 Hz" Ztrans_slns (intop_mic(p3)/intop_mic(1))/intop_in(2*slns.vz) "Acoustic transfer impedance" Zin_slns intop_in(slns.Zac)/intop_in(2) "Acoustic input impedance" L0_slns Labs_slns-Lref_slns "Microphone sound pressure level (normalized)" Labs_slns 20*log10(abs(intop_mic(p3)/intop_mic(1[Pa])))[dB] "Absolute level" Lref_slns with(15,Labs_slns) "Reference level at 500 Hz"