Specifically, the Audio Update 2007-001 [660KB] 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.
Apple is recommending the Audio Update for all Intel-based Macs running Mac OS X 10.4.10. However, the company notes that the update can be installed only if the Mac OS X 10.4.10 Update client (or Universal Server) update is already installed.
For those Intel Mac users who have yet to upgrade to Mac OS X 10.4.10, Apple has re-released Mac OS X 10.4.10 as Mac OS X 10.4.10 Update v1.1 (Intel), which bundles the audio fix.
Mac OS X 10.4.10 Update v1.1 (Intel) is available as a 72MB download in delta form or a 297.2MB download in Combo updater form.