All are connected with air tubes or what Psyko calls WaveGuides which travel to both earcups, with their location producing the latency in either ear for a surround-like experience. There is no digital signal processing involved, with the design responsible for all the timing, based purely on the speaker's location relative to a user's ear. Surprisingly deep bass and excellent noise cancellation make this a hard set of ear cans to beat. Now if they only has a mic . Now I can actually hear someone creeping up on me. Their footfalls or shuffles giving them away as they try to creep up on me.