Jon and Justin discuss the procedure for testing a house PA system. Firstly, listening tests are carried out using a mono pink noise source and testing one speaker system at a time. Having found some differences in sound between the left and right, Jon and Justin start the logical process of detection, diagnosis and correction, describing the processes they use as they go. After adjusting several components in the system, further listening is required followed by further adjustment until the boys are reasonably happy.

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