L1 Pro Hiss

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Some people turn up the inputs 1 and 2 without nothing attached and are concerned about hiss from the system.
It's not advised to turn up a channel to halfway with nothing plugged into it and NOT mute it. Not with this system, or any PA system. This is not how a PA is used. As has been stated several times on various posts, the Pro32 is a very loud system with an aggressive taper on the first 50% of the volume dial. Digital gain + analog gain working together to provide a smooth taper for mic or line level instruments without having select what type of input source. Noise floor levels are imperceptible when proper gain staging in use, and in the presence of ambient event noise.

Source: Craig Small - Bose

Why doesn't this happen on channel 3?
Channel 3 is purely line level, so it has less gain. If you're running aux out, I'd recommend going into ch 3

Source: Craig Small - Bose