The cables ACS uses for IEMs have the 0.78mm variety of 2-pin. Therefore, the cables are interchangeable with other IEM cables that use this spec. However, there is another version of 2-pin connector on the market which has a 0.75mm pin, the ACS cables would not work with these ones. However, prior to ordering the cable for IEMs from ACS, we need to clarify about the position of the socket on the other IEMs. On the ACS IEMs, the socket is slightly recessed into the mould and shaped like the rectangular shape on the end of the cable connector. So if the other IEM’s cable had a cylinder shaped barrel on the 2-pin connector it wouldn’t properly fit into the recession. If the socket on the IEMs is not recessed, then it shouldn’t be a problem. If this explanation is unclear, it might be a good idea to ask client to refer to the banner image of the IEMs on our website or even to get him to take a picture of his IEMs and email them to us.