The package comes with a small installation script that essentially moves the three included driver extensions into their locations and adjusts permissions on them accordingly. Recently, an open-source project 'iSub Fix' has become available, which is a small driver replacement for PowerPC-based Macs running OS X 10.5.8, which should get the iSub working again. The problem appeared to be a driver-related error but neither Harman Kardon nor Apple stepped up to fix the issue and owners had to resort to other speaker systems. When Apple released some of the final updates to OS X 10.5 for PowerPC systems, a number of Harman Kardon iSub owners found their speaker systems no longer worked properly with their computers.
