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Message: <blockquote data-quote="hughvane" data-source="post: 708564" data-attributes="member: 56231">Doing what you're trying will produce dreadful feedback (squeal) because you need to keep the input (mic) as far away as possible from output (speakers).The amp inside your iMac is not very powerful, nor will the built-in speakers tolerate too much input.The simplest way to use your Mac as a PA system is to have a line out from the headphones jack to an external amplifier, to a set (pair) of speakers.  If you have a portable stereo, like they used to call 'ghetto blasters', you can use the Aux input on that to plug the line out from your Mac to it, select Aux on the stereo, and fiddle with the output volume. Just keep your mic well away from the speakers.</blockquote>