in my band, i use the headphone socket from my laptop to connect it to a small mixer, which then goes into the PA, usually via a DI box.
on many PAs, and at home going through a guitar amp, if my laptop is plugged into the mains there is a load of humming. noise humming.
generally i can just solve the problem by using hte battery power on the laptop.
BUT on some PAs there is no humming, plugged in or not.
what is the difference between the humming PAs and the non humming ones?
also: neighbours just started. its pretty high drama.
lots of po:leece