https://www.sony.net/Products/LDAC/

We, Qudelix, have developed the LDAC library for QCC512x by ourselves, upon the official technical partnership contract between SONY and Qudelix. It's the proof of the world-class R & D capability of our team, and we're very proud of that.

Every line of the LDAC software library is optimized for the QCC512x platform and KALIMBA DSP architecture. The highly optimized LDAC library and the ultra-low-power QCC512x enables the LDAC streaming more secure and more extended.

LDAC Latency

5K offers a software option to adjust streaming stability and latency.

• Secure (most prolonged latency)
• Moderate (Balanced stability and latency)
• Aggressive (min. latency)

In the Aggressive Mode, the latency(lag) is less than half of the CSR8675 LDAC, enabling video watching and mobile gaming without experiencing distinguishable delay or lag.

LDAC Bitrate

The Qudelix mobile app displays the real-time active LDAC bitrate. Qudelix-5K is the only receiver that provides accurate bitrate information.
You may able to find some source device that doesn't reach the highest LDAC bitrate.

Optimal LDAC Sample Rate

Sony LDAC supports the sample rate up to 96KHz. Typically, most source audio is 44.1KHz, and YouTube Audio streaming is 44.1KHz as well. Android automatically selects the highest LDAC sample rate, 96KHz, and it upsamples the source audio to 96KHz for the LDAC encoder. For a 44.1KHz source, encoding 44.1KHz@909kbps would provide slightly better sound quality than encoding 96KHz(Oversampled)@990kbps. You can opt-out the supported LDAC frequencies and fix the LDAC sample rate to 44.1KHz. If you usually listen to 44.1KHz sources, fixing the LDAC sample rate at 44.1KHz, as is, would provide the best sound quality as well as slightly longer battery time.