How do I go back to OS 10.6.8 on an iMac with OS 10.7.3 pre-installed?

Hi, I bought an Apple refurbished iMac (late 2011, i5 processor) to replace my dying 2005 iMac. It came with OS 10.7.3 pre-installed and no installation discs. I want to go back to OS 10.6.8 to be compatable with ProTools LE 8.05.
I have a Snow Leopard Mac Box Set. The installation disc is OS 10.6.3. When I try to start the new iMac from the Box Set installation disc, I get an error message:
"You can't use this version of the application install mac OSX with this version of Mac OS X. You have install Mac OS X 23.1.1"
Can anyone suggest a way for me to revert from OS 10.7.3 to OS 10.6.8?
Thanks,
Greg

Thanks for the reply. I was afraid this might be the case. However, I think the new refurbished iMac must have originally come with earlier version of the OS and 10.7.3 was installed during the repairs. I found a work-around:
- Made a disc image of the iMac running 10.6.8 and saved it to an external drive
- Connected the external drive to the new iMac
- Started the new iMac from the emergency partition created by 10.7 (Command R while starting)
- Used Disc Utility to erase the main partition of the new iMac and install the disc image of the old iMac
The new iMac now restarts in OS 10.6.8 and all the programs open. Not the ideal solution, but it worked.

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