Rose RS250A does not sync with other Airplay Speakers

I purchased the RS250A to replace a Cambridge Audio CXNv2. I use the RS250A to stream iTunes from a Windows PC to a preamp/amplifier combo driving a set of passive speakers. I also have a wireless speaker which I sometimes use as a “fill-in” speaker for a portion of the room which is a bit dead from the sound of the main speakers. With the CXNv2, the two speaker systems would always sync perfectly with no observable delay between the two. I have never been able to achieve this with the RS250A. There is always a delay, which sounds like an echo, when using the RS250A with the fill-in speaker. Has anyone successfully synced the RS250A with another Airplay speaker? Any ideas as to what the issue might be?