Harman/Kardon speakers designed to work with Macs 1999/2000 | Apple pro, Harman kardon, Imac g4
Vintage Apple Pro Speakers by Harmon Kardon for iMac Power Mac G4 M8756G/A M6531 | eBay
Y2K Aesthetic Institute — Power Mac G4 Cube with Apple Pro Mouse, keyboard,...
Found a Set of USB Harman Kardon Soundsticks at the Thrift Store for $13 and surprisingly they work great! I have tested them on my blueberry iBook and both Titanium And Aluminum
Harman / Kardon / Apple M6531 Clear Pro Speakers | Reverb
Apple Pro Speakers Harmon Kardon for iMac Power Mac G4 Vintage M8756G/A M6531 | eBay