S.M.S.L M400 HiFi Audio DAC, Supports MQA decoding AK4499 Chip, Second XMOS XU216, DSD512 32Bit/768kHz, Bluetooth 5.0 Fully Balaced Decoder Hi-Res Hi-end, USB/ Optical/ Coaxial/ I²S/ Bluetooth Input
Amazon.com: S.M.S.L AD18 HiFi Audio Stereo Amplifier with Bluetooth 4.2 Supports Apt-X,USB DSP Full Digital Power Amplifier 2.1 for Speaker,Small 80Wx2 Class D Amplifier with Subwoofer Output : Electronics