[PDF] What you Need - NTi Audio Analyzer, Sound Level Meter main sound is therefore also from the front PA, while the sound from the delay speaker is perceived as a reverb, resulting in a rich sound experience. Further, it is now possible to increase the sound pressure of the delay speaker up to 10 dB higher than the front PA without affecting the perception of sound direction. A Basic Live Sound Setup Diagram - Cheap Advice On Music A Basic Live Sound Setup Diagram. The first one shows the interconnections made at the mixing or FOH (Front Of House) position between the mixer, the power amplifier, and the dual effects box. (Click on the diagram for a somewhat larger version on its own page.) The second diagram shows the interconnections made to the instruments, microphones,..