First thing is you need to have a signal going to the headphones for them to work.
If you are getting a signal the green light should be lit.
If only the red lamp is lit the headphones are not getting a signal.
If hooked into a television you should have them plugged into a Fixed Output not variable output..
If you only have a variable output then you must turn the speakers off on the television and then turn the volume up on the TV in order to send a signal to the headphones.
If you are using a amplifier make sure you are using the correct output. Tape Monitors generally will not work as this output is not amplified.
Lastly try using an rca to headphone adapter and plug them into a headphone jack.
Don
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