This is similar to protecting your highlight when shooting video. You can confirm clean audio with headphones or speakers. This is when you listen for obvious problems like a ground loop hum or a noisy or distorted audio signal. Ground loop hum can occur when you’re connecting A/C-powered audio devices together. Normally, equipment grounds to the A/C plug it’s directly connected to, but sometimes, due to differences in grounding potential, the device chooses the path of least resistance through your audio cables, not to the ground on the plug. This electrical interference hum needs to be eliminated. The solution is to add a direct box (aka a DI, Figure 1, below) into the workflow to lift the ground and force the devices to ground, as intended, to their respective plugs. A Behringer DI Step 4: Setting PA speaker and soundboard volume levels Using a DI should be done automatically when you are connecting audio from a remote laptop both to lift the ground and to convert the unbalanced signal to a balanced XLR connection.įigure 1.
I start with my PA speakers set to one-quarter volume and then I increase the volume levels for each input and the main output. If your levels are set properly, you should be operating in a range where the levels for the inputs and output are just below the parity level of 0 on the level faders. If your fader levels are too high, then you don’t have any ability to increase the levels as needed, and if they have to be set too low, this means that your loudspeakers are set too high and the signal for the live stream won’t be within a desirable range.
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It might take a bit of back-and-forth to find the right balance between the levels on your loudspeakers, input volume, and main output volume, but this is all a part of mixing professional audio.
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