監聽喇叭或喇叭本身沒有所謂平衡或非平衡...... 訊號進出介面和傳輸方式才有所謂的balanced or unbalanced............... Unbalanced Audio Most domestic or semi pro audio equipment has unbalanced audio inputs and outputs......This means that the audio output (left, right, or mono) appears on a single wire, and is referenced to "0V" or "Ground". Unbalanced audio is fine for the domestic environment..........Problems start to occur if the signals are being carried over long distances, especially if the source and destination have separate mains supplies. Balanced Audio Most of professional equipments will have balanced audio inputs and outputs, usually on 3-pin "XLR" connectors...... A balanced audio signal consists of a pair of wires carrying the audio signal in anti-phase with each other. Relative to 0V, if one wire carries a positive voltage, the other carries an equal and opposite negative voltage....... The 3 wires used in a typical XLR lead are often referred to as Ground, Live and Return,.....or Ground, Hot and Cold. "Live" and "Return" carry the "in-phase" and "out-of-phase" versions of the audio respectively.... The advantage of balanced audio over unbalanced audio is it's ability to reject external interference added as the signal is carried over the wire..... The receiving equipment takes the voltage difference between the two wires as the input signal. Interference will usually get added to both wires equally, and so gets ignored by the receiving equipment........