Unlike at home or in a studio where you are concerned primarily with the sound quality for playback to a very defined listener area in a generally well behaved environment, in a live performance
venue you need to consider the sound quality for live reinforcement to a large listener area, and sometimes in a less that desirable listening environment. That means that considerations such as whether the speakers provide proper coverage of the listener area while minimizing coverage where you don't want it should be a priority. So should the ability to provide appropriate sound levels and response to all listeners. And if you are planning on using existing
system processing and amplification, then compatibility with those is obviously also important.
So my response is that the Zx5 is a good
speaker, is well received in general and may be a good choice. However, whether it, and specifically the 60x60 version, is actually a good option for your specific situation can't be assessed without knowing more about the situation and your goals.