Is LDAC Lossless and What Does It Mean for Your Music Player
LDAC is a Bluetooth audio codec, not a promise that every lossless recording reaches your headphones unchanged. It can carry high-resolution audio content using a compressed wireless connection, but the source file, negotiated codec, connection conditions, and headphones all affect the playback path. A FLAC file remains lossless as a stored file even when Bluetooth transmission uses compression. For Surfans F20 Pro listeners, LDAC offers a wireless option with compatible receiving devices; a wired connection is the simpler way to avoid the Bluetooth codec stage.
Separate the file from the connection
Lossless describes preserving the audio data in a source through a lossless encoding process. FLAC and ALAC are examples. Bluetooth describes how audio moves between devices. The player decodes the source, then the wireless path may encode the audio again for transmission.
That is why downloading a lossless album does not automatically create a lossless wireless chain. The Surfans format guide explains stored formats. For streaming, the service's quality setting is another separate factor. Offline, Hi-Res, and Bluetooth are not interchangeable labels.
What the LDAC bitrate numbers mean
Sony's LDAC documentation describes a maximum bitrate of 990 kbps and a best-effort mode that adjusts between 330, 660, and 990 kbps according to connection conditions. Do not treat 990 kbps as a value that every session maintains. The active setting and receiving device matter.
For context, uncompressed stereo PCM at 16-bit/44.1 kHz carries 1,411.2 kbps of audio data, calculated as 16 times 44,100 times two channels. This calculation helps explain the different numbers, but bitrate alone cannot prove whether an encoding is lossless: lossless formats also compress data. The practical point is that a Hi-Res Wireless label should not be read as an end-to-end, bit-perfect guarantee for all recordings.
Both ends need compatible support
The transmitter and receiver must negotiate a codec they both support. Seeing LDAC in the player's specification does not mean every Bluetooth earbud will use it. Check the headphone manufacturer's codec list and, where available, the active connection information on your devices. A Bluetooth version number by itself does not establish LDAC support.
F20 Pro's product information lists Bluetooth 5.0 with LDAC. Do not apply that statement to every Surfans player: F20 and other models have their own specifications and hardware revisions. Confirm the exact model before following a codec tutorial.
Choose stability for listening on the move
Start with the devices nearby and test a familiar track. If audio breaks up, reduce distance, check for interference, and try the receiving device's stability-oriented setting if available. Do not force a high-bitrate mode merely because it looks better on a settings screen. Continuous playback may matter more during a commute than the highest available number.
When comparing wired and wireless, keep listening volume comfortably low and reasonably matched. A louder option can seem more impressive without being more accurate. Different headphones also introduce differences in fit, tuning, and noise cancellation, so comparing two unrelated models does not isolate the codec.
When wired playback is useful
A wired connection bypasses Bluetooth encoding. It does not guarantee a particular sound quality, and app processing or resampling may still occur before analog output. F20 Pro offers 3.5mm and 4.4mm connections; use only the cable and output intended for your earphones. Read the balanced output guide before changing cables.
Use wireless when convenience fits the situation and the connection is reliable. Use wired playback when you want to remove the Bluetooth stage or already prefer wired IEMs. Neither choice needs exaggerated promises to be useful.
FAQ
Does a FLAC file become a bad file when played over Bluetooth
No. The stored file is unchanged. Bluetooth affects the transmission path during playback.
Does LDAC always operate at 990 kbps
No. Sony describes adaptive operation and several bitrates. The active mode depends on device support and connection conditions.
Does 4 point 4 mm guarantee bit perfect playback
No. It is an analog headphone connection, not proof of the digital processing path. App and system behavior still matter.