I've connected 4-wire headphones for audio only, but they don't provide a good enough connection for clear sound. They seem to work well when connected to a speaker that uses a 3 wire cable. I tested with a 3-wire audio cable connected to a Fire tablet and an iPhone SE. In both cases the jacks worked with an external speaker but not with 4-wire headphones. I believe that such connectors should only transmit sound to 4-wire headphones, and if they are not designed for this, then this should be stated in the description.
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