Although the Apple Pro Speakers look very similar to the speakers that come with the Power Mac G4 Cube computer, they are functionally very different. The table below outlines these differences.
| Characteristic | Apple Pro Speakers | Power Mac G4 Cube Speakers |
| Power Source | Apple Speaker sound output port | USB |
| Sound Connection | Apple Speaker sound output port | USB |
| Harmon Kardon iSub | compatible | compatible with Mac OS X 10.1 or later |
The Apple Pro Speakers cannot be used with any computer that does not have an Apple Speaker sound output port. The following computers have an Apple Speaker sound output port:
Refer to article 58764 "Power Mac G4 (Digital Audio) and (QuickSilver): Sound Output Ports" for more information about the sound capabilities of the Power Mac G4 (Digital Audio) and Power Mac G4 (QuickSilver) computers.
For information on how to differentiate between Power Mac G4 models, refer to article 58418: "Power Mac G4: How to Differentiate Between Models."