No. The Macintosh Quadra 900 supports 8-bit sound.
Sound in overview:
- Quadra 900 and 700 microphone inputs are monophonic.
- Quadra 900 external sound input takes in stereo sound and turns it into
a single audio signal before recording by combining the two channels.
- Both Quadra models play stereo samples through Batman (an updated
version of the Apple Sound Chip) if you have stereo samples from a third
party. Otherwise everything comes out monophonic.
Note one exception: If you have an internal CD-ROM, stereo tracks
"Play through" to the headphone output in stereo. If you record from an
internal CD, it will be monophonic.