The Quadra 605 supports both recording and playback of sounds at 8-bit and sampling rates of 11 kHz or 22 kHz. There are several ways to playback 16-bit 44kHz files on a Quadra 605.
One solution is to install Sound Manager 3.0 on the Quadra 605. It will automatically convert 16-bit 44kHz files to 8 bit 22kHz files on the fly for playback. Another method is using QuickTime 2.0 to playback 16-bit 44kHz audio movie files. QuickTime 2.0 will automatically convert them to 8-bit playback on the Quadra 605.