I found that the shielding on S-vid cables can vary from model to model. I use a 15-foot Monster 2 S-vid cable, yet the picture quality's noticeably better than the 6' OEM cables that I was using previously. With the OEM cables, there was noticeable ghosting with graphical images and the colors were not as vivid. I suspect it had to do with the connectors or the shielding because I lived in an area with a lot of RF interference. After swapping out the cables, the ghosting went away and I had to recalibrate the color levels on my TV. 25' is a long run, but for your situation I would guess that something having to do with the connector is more at fault. If that 25' cable was an OEM quality cable, then you should try a similar test with something better constructed like AR, basic Monster, or Radio Shack Gold Series cables. In my case, it didn't take much to notice an improvement.