This one's got me stumped! I had, until about 3 years ago, a PowerMac G4 with the Digital Audio socket in the rear in which I had a Griffin ProSpeaker adaptor to plug in a pair of tabletop JBL speakers. ...a lovely setup which did the job well and worked fine. I bought an Intel iMac after that and shelved the JBL's until today when I thought i'd give then a second lease of life. Two hours later, i'm still scratching my head! I didn't remember until I saw it again that the Digital Audio jackplug looks very similar to a regular 3.5mm stereo headphone jackplug, but is shorter by a considerable way, and as the JBL speakers have raw speaker cable ends which plugged into the Griffin adaptor, i'm stumped for an easy solution. Can the Digital Audio plug be converted into a regular 3.5mm stereo plug to go into the iMac? Is there an alternative adaptor altogether to wire the speakers into, or am I looking at a small audio amp of some sorts?? Any ideas or recommendations appreciated! PS, did/does the Digital audio plug that Apple used in those days have a 'name'? Was it a standard of any type or description?