Without knowing what brand headphones you have it is hard to know what to advise... HOWEVER if your headphones have a small plug (1/8 inch) you must use a STEREO type 1/8 to 1/4 inch adapter. If you use a mono, that will short out the output of at least one side.
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Without knowing what brand headphones you have it is hard to know what to advise... HOWEVER if your headphones have a small plug (1/8 inch) you must use a STEREO type 1/8 to 1/4 inch adapter. If you use a mono, that will short out the output of at least one side.