Part 4 - Gain structure - 20 Points Total Calculate and fill in the values for the following gain structure: 7' B 100 dB SPL Mic sensitivity: Mic Pad Mic preamp: Rec. level: Power Amp: Speaker Sensitivity: @4 feet I Pa yields -46 any .10 an -2 dll +4 dflu yields IW yields 88 an SPL. 100 W into 40