I've built a 8x8 rbg matrix using the same kind of chip. It has a lot of ribbon cable connecting the led's in groups of 4. It's about 800mm square. Anyway When i switch it on it interferes with my FMradio big time, really loud an all over the house. You can listen to the radio with it on. So i had thought i would just shield the whole thing when it's finished. They produce a lot of high frequencies them chips i guess and with lots of wire to the led's that's lots of ariels. I had/have no idea how to fix it that's why i though shielding would work..i hope it does