Snow Leopard, quicktime H264 playback, cinema speakers cause video freezing

I'm running Snow Leopard 10.6.1 on an early 2009 MBP 17 (2.66ghz) with 9400 and 9600 graphics chipsets. This version of Snow Leopard supports hardware-accelerated H264 video playback on the 9400 chipset. I have a 1080p video which plays back flawlessly using Snow Leopard's Quicktime player with hardware accelerated decoding (averages less than 5% of the CPU during playback of 1080p video).
Since I added the Apple Cinema Display 24 (ACD24) with its built-in USB speakers, I can no longer play this video back smoothly with the ACD's speakers in use for the sound. This setup causes frequent video playback pauses and freeze-frames (sound continues to play).
If I switch the system audio back to the MBP's built-in speakers, the playback immediately returns to being flawless.
I've also noticed that Windows 7 under Bootcamp does not work very well with these speakers, which frequently pop and click under Windows 7 when music or video is being played.
Any suggestions for troubleshooting these problems?

I seem to have fixed it.. I spent an hour troubleshooting. I logged into my vanilla guest account and the glitches were still there, so I knew if the problem was from 3rd party software, it was installed system-wide or at least for all users. So I removed all my 3rd party PreferencePanes and the problem disappeared. I slowly added them a couple at a time and the culprit was the Unsanity software (Application Enhancer, FruitMenu, MenuMaster, etc) .. I went to their site and the last update is about Leopard compatibility.. lol. So I think I'm just not going to use their software anymore. Problem solved!

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First, you cannot do this if you have a Boot Camp partition.
Second: Create a new partition.
1. Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
After the main menu appears select Disk Utility and click on the Continue button. Select the hard drive's main entry then click on the Partition tab in the DU main window.
2. You should see the graphical sizing window showing the existing partitions. A portion may appear as a blue rectangle representing the used space on a partition.
3. In the lower right corner of the sizing rectangle for each partition is a resizing gadget. Select it with the mouse and move the bottom of the rectangle upwards until you have reduced the existing partition enough to create the desired new volume's size. The space below the resized partition will appear gray. Click on the Apply button and wait until the process has completed. (Note: You can only make a partition smaller in order to create new free space.)
4. Click on the [+] button below the sizing window to add a new partition in the gray space you freed up. Give the new volume a name, if you wish, then click on the Apply button. Wait until the process has completed.
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It would be wise to have a backup of your current system as resizing is not necessarily free of risk for data loss. Your drive must have sufficient contiguous free space for this process to work.
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Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo
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HI,
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Message was edited by: artemisworks

Just so I understand this correctly:
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3. Where is the "partition"? Do you have either drive partitioned?
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 DALE

Snow Leopard, quicktime H264 playback, cinema speakers cause video freezing

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