Please include the test result when resorting to email support
After connecting to the wall outlet and pressing the power button, does the receiver's red indicator light up?
Use fresh batteries for transmitters. After powering them on, do transmitter screens and both B & C indicators of the receiver turn on and stay solid?
If B & C indicators flash, does resetting help?
If the reset doesn't work, before the reset, are all units off? During reset: does screen B blink and 596MHz appear (or screen C blink and 586MHz appear)?
Is the audio source hooked up to the R+L in jack, while the output is connected through R+L/AUX out?
Are all volume controls on the receiver/speaker set to a decent level?