seeed studio reSpeaker Flex XVF3800 Circular-4 USB Mic Array

Designed for developers who need all-around voice capture and the flexibility to choose their own host platform, the reSpeaker Flex XVF3800 Circular-4 combines a 360 microphone array, onboard XMOS audio processing and a modular split-board architecture. It is well suited for robots, smart displays, voice-enabled devices and interactive terminals where users may speak from different directions. The circular array features four PDM MEMS microphones with 44 mm spacing for 360 omnidirectional voice capture. The microphone board connects to the XVF3800 core board through the included 20 cm, 24-pin FPC ribbon cable, allowing both boards to be positioned independently inside an enclosure.

Powered by the XMOS XVF3800, the system provides AEC, AGC, DoA, multi-channel beamforming, VAD, noise suppression and dereverberation to support clearer far-field voice capture in noisy and echo-prone environments. In USB mode, the USB-C and locking PH 2.0 ports support UAC 2.0 audio for use with PCs and SBCs. Developers can also use compatible I2S firmware with a XIAO ESP32S3 or another host MCU for embedded integration. USB and I2S operate as separate firmware modes. The core board includes an unpopulated XIAO ESP32S3 footprint, exposed I2S and I2C connections, a 3.5 mm AUX output and a connector for an external speaker.

This is an open-board development platform; XIAO ESP32S3, enclosure and speaker are not included.