Here's my 10.9.2 report
iMac Specs:
iMac 27 inches , late 2012, Processor 3,4 GHz Intel Core i7, NVIDIA GeForce GTX 680MX 2048 Mo, OS X Mavericks 10.9.2
Test using a Focusrite Saffire Le Firewire 400 connected in the thunderbolt port using a thunderbolt adaptor through a firewire 800/400 cable.
Tests done with Safari 7.0.1 (32 bit) and QuickTime 10.3 (64 bit).
Here are the tests:
I launch Safari 7.0.1 (32 bit ) watching the actual Apple.com ad. (http://www.apple.com/#video-tv-spot)
The ad’s audio is nice.
Test 1:
I launch Garageband 10.0.1, (latest version) the ad’s audio plays correctly.
With 10.9.1 the audio was full of clicks and pops. I had to quit Garageband for the ad’s audio to play back correctly.
Test 2:
I launch Logic Pro 9.1.8 (latest Logic 9 version in 32 bit mode, same test in 64 bit mode), the ad’s audio is distorted if I set the Logic I/O buffer to 32 samples. The ad’s audio plays correctly (or with just a littles clicks here and there) using a 64 samples I/O buffer.
With 10.9.1 the audio was full of clicks and pops. I had to quit Logic for the ad’s audio to play back correctly.
If I set back the Logic’s I/O buffer to 32 samples the audio is distorted but get back to normal the moment I quit Logic Pro.
Test 3:
I launch Quicktime 10.3 (latest version) , the ad’s audio has just a littles clicks here and there.
I open a .mov file in Quicktime and its audio is full of clicks and pops.
I quit Quicktime and the ad’s audio plays correctly.
Test 4:
I relaunch Quicktime the ad’s audio is full ok clicks and pops.
I quit Safari and the Quicktime audio has still some clicks here and there.
In short 10.9.2 is better but not perfect 😟
But, look at this! Either with 10.9.1 or 10.9.2, if I set an aggregate device and set the Logic and Garageband audio preferences to use it, then I don’t have any audio problem at all (so far) and best of all, I can set back the Logic’s I/O buffer to 32 samples!
So I’m done fighting those **** Mavericks audio issues.😎