The Bluetooth Special Interest Group (SIG) officially adopted the High Data Throughput (HDT) specification into Bluetooth Core 7.0 on November 4, 2026. This update significantly increases the maximum physical-layer data rate of Bluetooth Low Energy from 2Mbps to 7.5Mbps. The boost provides the bandwidth necessary for standardized high-resolution and lossless audio streaming, addressing a long-standing limitation of wireless connectivity.
Hardware Requirements and Speed Increases
Bluetooth HDT introduces higher-order modulation schemes, including π/4-QPSK, 8PSK, and 16QAM, alongside Forward Error Correction. These changes allow the technology to pack more bits into each radio symbol, pushing peak speeds to 7.5Mbps. This rate is nearly four times faster than conventional Bluetooth Low Energy and 2.5 times faster than Bluetooth Enhanced Data Rate.
The increased speed allows for bit-perfect CD-quality audio and 24-bit/96 kHz high-resolution tracks without aggressive lossy compression. Even 192 kHz audio, which requires 9.2 Mbps of raw bandwidth, could potentially be supported through efficient lossless compression. The specification also features an adaptive data rate, adjusting transmission speeds based on signal quality to maintain reliable connections.
However, HDT requires entirely new radio hardware. Existing Bluetooth Low Energy devices cannot gain HDT functionality through a firmware update. Qualcomm has announced its FastConnect 8800 wireless setup claims HDT capabilities, but actual product support still needs confirmation. The Bluetooth SIG notes that HDT is an optional feature, meaning manufacturers are not required to implement it in new devices.
The Missing Codec Standard
The primary obstacle to realizing high-quality wireless audio is the lack of a standardized lossless audio codec. Bluetooth HDT serves only as the transmission layer, similar to building a wider highway without defining the vehicles that travel on it. Audio still requires a dedicated codec to package, time-align, compress, and error-correct the music data.
Current standards like LC3 are designed for ultra-low power consumption and are strictly lossy formats. The Bluetooth SIG is currently working on a High-Resolution/Lossless Codec project to introduce standardized support into LE Audio. Formal multi-vendor interoperability testing is scheduled for March 2027, with a finalized codec standard expected later that year.
Until the standardized codec and necessary LE Audio profiles are released, the market may see a proliferation of proprietary codecs. Third-party vendors might introduce their own solutions to utilize the extra bandwidth, potentially leaving the industry in a fragmented state. Consumers should wait for the 2027 rollout before expecting universally compatible lossless wireless audio products.
Source: Android Authority
