Apple has released an update to fix an issue brought to light since the release of Mac OS X 10.4.10 where by speakers would pop prior to a sound.
Audio Update 2007-001 is recommended to all users of Mac OS X 10.4.10 on Intel Macs.
The Audio Update 2007-001 addresses an issue with version 1.0 of the Mac OS X 10.4.10 Update in which a "popping" sound might be heard with some external speakers on Intel-based Mac. This update is recommended for all Intel-based Macs running Mac OS X 10.4.10.