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Product Overview The DSP4.1 multi-channel stereo amplifier board features a high-performance 32-bit processor. It supports ADC and DAC sampling rates of 48K for both input and output. IIS supports input and output rates from 44.1k to 128k. Audio decoding algorithms support: MP2, MP3, MP4, WAV. Encoding support: MP2/MP3, IMA-ADPCM. Audio effects algorithms support: noise reduction, 3D stereo surround sound, wide field, high-frequency excitation, PEQ equalizer, DRC dynamic limiter, phase delay. Supports online computer tuning and over-the-air (OTA) firmware upgrades. Equipped with Bluetooth input and supports USB lossless sound card input for immersive audio quality. Bluetooth supports external Bluetooth modules and codecs such as Qualcomm aptX and LDAC. Accessories supported: encoder, rear connector board, and external aptX Bluetooth. Input support: onboard Bluetooth input, USB lossless sound card input, aux 3.5mm analog input, OTG USB input. Output power: 4.1 channels (power outputs are 50W x 4 at 4 ohms, 100W x 1 at 2 ohms). Power supply: supports voltage input from 6V to 24V, current input from 3A to 10A. Standard power output requires a 24V supply.