Chosen Solution
sound coming from speaker has a low pitched motor boat distortion.
First you’ll need to try to isolate out which speaker needs replacing. Go into your Preference settings and open the Sound control panel, then you’ll need to click on the ‘Output’ section. Now alter the bios control to focus the sound to the left and then right speakers that should guide you to what speaker needs replacing. iMac Intel 27" EMC 2546 Left Speaker ReplacementiMac Intel 27" EMC 2546 Right Speaker Replacement] Apple offers the speakers in a matched pair: Late 2012 27” iMac Speaker pair - Apple P/N 923-0300
