I am using wired connections. I did some more playing around and found a lot of other radio stations that play on both the Pi Players. The radio station I was trying to play is 94.7 | 947 (Top 40/Pop) based in South Africa. I noticed that the bitrate is 64k, the other stations that I could play on both players were either 48k or 128k. Seems like there could be a problem with the 64k bitrate. I have synchronised the players with no problems.