Hello folks, I regularly leave audio files playing on my iMac for about 5 hours non stop with the volume set to medium or just below, never on full. I was just wondering how long would the internal speakers last if they're used like that everyday? Do you think I need to get external speakers? I wouldn't be getting them for the sound, I'm ok with the iMac's internals, if I did it would be so that I don't burn the internals out, if that is at all possible? Thanks.