I will shed some light on the mystery of wireless speakers. In fact, after reading this post, you will have a much better understanding not only about how wireless speakers work but also about wireless technology in general. If you already have a background in wireless engineering then you don’t have to read this post because I will describe the basics. I will not go into specifics because those differ between different models. However, if you don’t have a background in electronics and are curious about how wireless speakers work than I highly recommend you keep reading the next few sections.
First of all, wireless speakers can be differentiated between the way they send the audio. Obviously, all wireless speakers involve transmission which uses radiofrequency signals. However, the way they actually sent the audio differs between different models. Analog wireless speakers utilize a technology which is called FM transmission. This technology has been around for decades. Uses a frequency modulation technology which is very similar to the weight you FM radio operates. The audio signal which is input into the transmitter is being used to change the frequency of a high-frequency radio signal. This radiofrequency signal is being received inside the wireless speakers. In order to generate the audio, the frequency of the signal is being recovered. From this recovered signal, the audio can be reconstructed.
Finally, the audio which is recovered is input into an amplifier which is located inside the speaker. The output of this amplifier is then connected to the transducers. As you can already imagine, you will not need an amplifier in order to operate wireless speakers. In that respect, wireless speakers are very similar to active speakers which also can be operated without using an external power amplifier.
However, FM transmission has some major drawbacks. The fidelity of the signal is not great as you can imagine when listening to an FM radio station. It is usually noisy to some degree and also easily is impacted by wireless interference. To overcome these shortcomings, modern wireless speakers use a digital technology. This technology converts the audio signal into data prior to the transmission. This data is then being sent over the air to the speakers. Inside the speakers, the audio is being decoded from that data. Digital technology has the huge advantage that interference can be much better tolerated. Usually, the speakers can recover the original data even though the signal is being disrupted. In addition, digital wireless speakers have much better audio fidelity.