In listening to this feed, it seems ground operations are on the right speaker and tower operations are on the left speaker. If you're mainly interested in listening to JFK departures and arrivals, then you could just mute the right speaker. Or you could just do as Jetscan suggested and tune into one of the other feeds that are exclusively JFK tower. Just keep in mind that most of the time JFK uses two tower frequencies (119.1 and 123.9) so you can choose a tower feed that has either one or both of those frequencies. I hope this helps.
Ron