The major drawback ist that this type of modulation is ‘analog’ which is the reason for the poor performance of analog transmitters. If you listen carefully to a CD over an analog wireless audio transmitter / amplifier, you will notice significant noise/static, low signal dynamics and low channel separation. Also, the signal quality will vary when you move around the room between the transmitter and receiver (the noise will increase locally and also the further the receiver is moved away from th