aptX is the wireless connection from your Bluetooth speaker to your TV or any device that has aptX, it means that aptX Low Latency audio delivers sound in sync with what's on-screen (no lip sync) and reduces delay to improve the end-to-end speed
of the audio.
Please be aware aptX only works with Android devices.
For further information about aptX please follow the attached link https://www.aptx.com/aptx-low-latency