It's generally best to provide a mono feed when possible (in my opinion at least) since this would cover the widest listener base. While listening using a desktop, the L and R speakers are seperated widely enough it's pretty easy to isolate the audio from the two feeds, smaller devices may make this difficult. It's also difficult to isolate them if a listener has hearing problems. If you do provide your feed in stereo (with both channels feeding seperate signals) please note this on your feed description so folks won't be caught off guard when they hear two transmissions going at once.