There can be a bad connection inside one of the connected devices.
Get a VOM and clip leads. Measure conductor and shield end to end on the interconnects while vigorously wiggling the connectors. Resistance should remain ZERO.
Repeat with each connector measuring between conductor and shield. Do both ends of the cable. Resistance should remain infinite.
If the above are true, problem is internal. DO NOT wiggle connectors to a power amp. You run the risk of dumping full power into the speakers. Use a dummy load.
Get a VOM and clip leads. Measure conductor and shield end to end on the interconnects while vigorously wiggling the connectors. Resistance should remain ZERO.
Repeat with each connector measuring between conductor and shield. Do both ends of the cable. Resistance should remain infinite.
If the above are true, problem is internal. DO NOT wiggle connectors to a power amp. You run the risk of dumping full power into the speakers. Use a dummy load.