AI Overview
When transmitting FLAC audio through LDAC, there is a
quality loss because LDAC is a
lossy Bluetooth codec, even at its highest setting. The original FLAC file data is compressed to fit within the limits of Bluetooth bandwidth.
Why Quality is Lost
- FLAC is Lossless, LDAC is Lossy: FLAC (Free Lossless Audio Codec) is a digital file format that compresses audio without discarding any data, making the uncompressed audio a bit-perfect clone of the original source. LDAC is a high-resolution lossy compression codec designed for transmission over Bluetooth, which necessarily discards some data using psychoacoustic modeling to achieve smaller file sizes.
- Bitrate Disparity: LDAC's maximum bitrate is 990 kbps (kilobits per second). A standard, uncompressed CD-quality audio stream (16-bit/44.1 kHz) has a native bitrate of 1,411 kbps. A high-resolution FLAC file (e.g., 24-bit/96 kHz) has an uncompressed bitrate of 4,608 kbps. LDAC's maximum speed is not fast enough to transmit either of these without further compression and data loss.
- Perceptual vs. Technical Lossless: While not technically lossless, LDAC at 990 kbps is designed to be "perceptually lossless" for most listeners. This means that the discarded data is typically in frequency ranges that most human ears cannot hear, making the resulting audio sound extremely close to the original wired source.
Summary of Loss
The amount of quality loss is minimal and likely imperceptible to most people when using LDAC's highest quality 990 kbps mode in ideal conditions. However, the transmission is not bit-perfect, so a technical loss of data is occurring.
For the best possible experience, ensure:
- Your source device (e.g., Android phone) and receiving device (headphones/speaker) both support LDAC.
- You manually select the "Optimized for Audio Quality (990 kbps)" setting in your device's developer options (if applicable), as many devices default to lower, more stable bitrates like 660 kbps or 330 kbps. This mode can be fragile and prone to stuttering in areas with a lot of wireless interference.
I also dunno where to choose the bitrate in LDAC... dun see the option.
But I usually see my FLAC bitrate about double of the LDAC max rate.