LDAC is a Bluetooth audio coding technology developed by Sony, with the full name "Low-Latency Audio Codec." Its biggest feature is support for a maximum transmission bitrate of 990kbps, far exceeding ordinary Bluetooth codecs such as SBC or AAC, and it can transmit high-resolution audio at 24bit/96kHz. In simple terms, it allows wireless earphones to carry an amount of information close to wired Hi-Fi, making it one of the top-tier solutions in Bluetooth transmission in terms of sound quality.
In terms of listening experience, LDAC can significantly reduce blurring of high-frequency details and the compressed feel of low frequencies, especially in classical music, vocals, or complex arrangements, where you can hear clearer instrument separation and spatial presence. When purchasing, if your phone supports LDAC (most Android flagship phones already have it built in), pairing it with LDAC-supported earphones will let you take full advantage of its benefits. However, note that LDAC consumes more power at the highest bitrate and is more susceptible to signal interference; the actual experience depends on the connection stability between devices.
Practical advice: If you prioritize sound quality and your phone supports LDAC, prioritize earphones with this codec and manually enable the "Priority on sound quality" mode in system settings; if you value battery life more or frequently commute in noisy environments, there is no need to insist on LDAC, as AAC or aptX is sufficient for daily use.