Two-in-one B20 Bluetooth Adapter Receiver with CSR8675 Chip and apt-X HD Support

This two-in-one Bluetooth adapter and receiver is built around the advanced CSR8675 chip, offering both transmitter (TX) and receiver (RX) modes for flexible audio connectivity. Whether you need to add Bluetooth to a TV, stereo, or pair two speakers wirelessly, this unit delivers reliable performance with support for high-resolution codecs including apt-X HD, apt-X LL, AAC, and SBC. With Bluetooth V5.0 and a range over 10 metres in open space, it ensures stable connections for streaming music, podcasts, or calls. The built-in 600mAh battery provides extended use, while multiple interface options including SPDIF, I2S, and AUX make it compatible with a wide range of audio equipment.

Features and Construction

The adapter combines a powerful chipset with practical design elements for everyday use. Its compact form factor houses the CSR8675 processor, digital-to-analog conversion with signal-to-noise ratio ≥75dB, and support for dual stream and multipoint connections.

Chip and Audio Processing

The CSR8675 chip integrates advanced noise reduction and echo cancellation technology for clearer audio transmission. It supports multiple codecs: in TX mode apt-X HD, apt-X LL, apt-X, and SBC; in RX mode the same plus AAC. This ensures compatibility with most Bluetooth speakers, headphones, and phones, with priority for apt-X HD when connected to a supporting device.

Connectivity and Interfaces

The unit offers SPDIF and I2S audio input/output interfaces that can be switched freely, plus an AUX interface for analogue connections. Bluetooth V5.0 operates in the 2.402-2.480GHz frequency band with power level 2 (Class II) and sensitivity of -80dBm <0.1% BER. It supports TX dual stream for connecting one transmitter to two Bluetooth devices simultaneously, and RX multipoint for linking two phones to the same receiver.

Battery and Power

A built-in 600mAh rechargeable battery provides approximately 18 hours of use in RX mode and 22 hours in TX mode. Charging via Micro USB 5V/0.5A takes about 3 hours, with a working current under 35mA. The unit includes 16Mb built-in eFlash and supports up to 64Mb external serial flash memory for firmware updates.

Uses and Placement

This adapter suits various scenarios where Bluetooth audio is needed. Its dual-mode functionality makes it versatile for both home and professional environments.

Home Audio Streaming

Use in TX mode to stream audio from a TV, computer, or CD player to Bluetooth headphones or speakers without disturbing others. The apt-X LL codec minimises audio delay for synchronised lip-sync during movies.

Car and Mobile Use

In RX mode, connect your phone to the adapter’s AUX input in a car to stream music or take calls with noise reduction. The multipoint feature lets you switch between two phones seamlessly.

Professional Audio Equipment

The SPDIF and I2S interfaces allow connection to professional audio gear such as mixers or amplifiers for low-latency Bluetooth streaming. Dual stream mode is useful for transmitting to two speakers for wider sound coverage.

Benefits and Buying Value

This adapter offers practical advantages for users seeking wireless audio without compromising on audio quality.

Extended Battery Life

With up to 22 hours of TX use and 18 hours of RX use, the built-in battery covers full-day listening or streaming sessions without frequent recharging. The 3-hour charge time is convenient for overnight top-ups.

Wide Codec Support

Support for apt-X HD, apt-X LL, AAC, and SBC ensures high-quality audio across different devices. This means less compression and better sound detail compared to basic Bluetooth codecs, especially for music and video content.

Simple Setup

No driver installation or app download is required; the adapter works plug-and-play with most devices. The clear mode switch and interface buttons make operation straightforward for all users.