At present, there are many Bluetooth headset products on the market, but relatively few Bluetooth speakers. The so-called Bluetooth speaker, in fact, refers to the speaker relying on Bluetooth transmission protocol as a carrier for data transmission. Because most mobile devices (mobile phones, notebooks, tablets) are equipped with Bluetooth chips, they can be quickly identified without the need for data or audio line connection, which is simple to operate and convenient to connect.
From the performance of sound quality, the effective audio data volume of CD quality data (44.1KHz sampling rate, 16bit sampling accuracy) is about 1.4Mbit. To transmit CD quality music signal, the transmission rate can be achieved only at 2Mbit per second. Bluetooth "2.1 + EDR" specification is adequate. Moreover, because these products often follow the mature acoustic structure of the traditional speakers, they can play wireless after integrating Bluetooth module, and their sound quality performance is comparable to that of the same level speakers.
In terms of specifications, although Bluetooth 3.0/4.0 standard has been proposed, the former is mainly reflected in the radio frequency modulation of Bluetooth in line with Wi-Fi, while the latter is reflected in the application of automatic power control, i.e. low power consumption. These two versions reflect the progress of Bluetooth technology, but have little connection with audio applications. For chip-level applications, it is suitable for version 3.0/4.0.
Bluetooth mainstream speakers are based on A2DP stereo protocol, while devices such as smart phones and tablets in 2012 all support the A2DP protocol, so from the point of view, Bluetooth speakers have no obstacles at all.