The Bluetooth Special Interest Group (SIG) announced the adoption of Bluetooth High Data Throughput, or Bluetooth HDT, on November 4, 2026. The group says the feature increases Bluetooth Low Energy’s maximum physical-layer bit rate from 2 Mbps to 7.5 Mbps, providing more capacity for data-intensive applications.
Lossless and high-resolution audio are among the intended uses. The SIG expects standardized premium wireless audio, which it describes as HDT’s first flagship application, to be released in 2027. The planned audio application also includes support for multichannel surround sound and spatial audio, the group says.
The SIG also says HDT improves energy efficiency and connection reliability. Faster transfers can allow radios to spend less time transmitting and more time in lower-power states, the group says. It describes reliability improvements as helping devices maintain more consistent communication across demanding operating environments.
Audio capacity and its limits
The 7.5 Mbps ceiling is 3.75 times the 2 Mbps rate of the Bluetooth LE 2M physical layer. That figure describes peak radio-layer capacity. Packet overhead and changing wireless conditions affect how much application data a connection can carry.
HDT uses the same channel bandwidth and spacing as existing Bluetooth LE, the SIG’s technical overview explains. Its higher rates come from changes to modulation and error correction that increase the information carried over the link. Updated packet formats also help manage larger data transfers.
Uncompressed stereo PCM provides a reference for the capacity involved. Its raw data rate is calculated by multiplying the sampling frequency by the bit depth and two audio channels:
| Stereo PCM format | Raw audio data rate |
|---|---|
| 16-bit, 44.1 kHz (CD quality) | 1.4112 Mbps |
| 24-bit, 48 kHz | 2.304 Mbps |
| 24-bit, 96 kHz | 4.608 Mbps |
| 24-bit, 192 kHz | 9.216 Mbps |
These figures exclude wireless transport overhead. Lossless compression can reduce the amount of data while preserving the original audio information, so lossless audio does not necessarily mean uncompressed audio.
The raw rate for 24-bit, 96 kHz stereo falls below HDT’s maximum, but that comparison alone does not establish reliable playback in a finished device. Uncompressed 24-bit, 192 kHz stereo exceeds the peak rate before transport overhead is added.
Proprietary lossless Bluetooth technology predates HDT. Qualcomm announced aptX Lossless in 2021, describing it as designed to deliver 16-bit, 44.1 kHz CD-quality audio over Bluetooth when radio conditions are suitable.
Optional rates and new hardware
HDT is optional within Bluetooth Core 7.0, the SIG says. Compliance with that specification therefore does not automatically establish HDT support, and support for HDT does not automatically establish support for its fastest mode.
The SIG’s Core 7.0 feature overview distinguishes the required HDT rates from the optional higher rates:
| HDT mode | Bit rate | Support within HDT |
|---|---|---|
| HDT2 | 2 Mbps | Required |
| HDT3 | 3 Mbps | Required |
| HDT4 | 4 Mbps | Required |
| HDT6 | 6 Mbps | Optional |
| HDT7.5 | 7.5 Mbps | Optional; requires HDT6 |
The SIG’s technical overview states that HDT requires new radio hardware. Backward compatibility allows HDT-capable devices to communicate with existing Bluetooth LE devices, but it does not give older radios HDT’s higher rates. Connections begin using an existing LE physical layer and can then switch to HDT. The feature also supports rate adaptation as wireless conditions change.
Beyond audio, the SIG identifies AI-enabled devices and spatial computing as potential applications. Wearables are another intended use, with faster movement of recorded sensor data among the examples the group describes.
