What is apt-X:

Apt-X is a kind of technology that can enhance the wireless sound quality

apt-X (classic)：

oCompression ratio: 4:1

oAudio format: 16-bit, 44.1kHz

oData rates: 352 kbps

Apt-X Low Latency：

oCompression ratio 4:1

oAudio format: 16-bit 44.1kHz

oData Rates: 352kbps

oLatency Less than 40 ms 

Apt-X HD：

oCompression ratio 4:1

oAudio format: 24-bit 48 kHz

oData rates: 576kbps 

Apt-X Adaptive：

oCompression ratio 5:1 – 10:1

oAudio format: 24-bit 48 kHz

oData rates: 276kBit/s & 420kBit/s

To a summary:

For best sound quality, you can choose apt-X HD;

For lowest sound Latency, you can choose apt-X LL;

If not pursuit of the ultimate, apt-x (classic) is a good choice.

If pursue the economy, AAC or SBC audio codec is the best choice.

Feasycom provide several choice for the apt-X solution.