EDIT: I have fixed this by adjusting the potentiometer inside the Audio Authority 9A60A
now it's working perfectly fine for all the default resolutions, and will be checking the forums on the following days for a way to adjust the tv geometry because I have just realized how bad it is..
I have been trying to set any of the modelines with my tv and I'm having a problem because I can't get none of them to show perfectly (1:1), I have attached two pictures so I can explain myself better because I don't know the correct words to explain the "aberrations" and "artifacts" my tv is showing.
I'm using Windows 7 x64, ATI HD4870, Catalyst 10.3 (it's the same with 13.1), and an Audio Authority 9A60A transcoder.
The first pic is using 320x240p, and the second one 640x480i. What is really strange is the 480i image is showing scanlines, something it didn't happened when using the s-video to component adapter. Probably is because it's not pixel perfect but is really strange.
I have installed Powerstrip, but I can't seem to get a perfect image by playing with the timings, I cannot find a tutorial with some steps to try and get a nice image.. I don't know if there is a problem with my lack of knowledge in configuring the timings, or is a drivers/operative system problem and I need to downgrade to XP/Catalyst 9.x to get more precise timings.
I am really trying to avoid reinstalling the OS, but if is necessary I will..