Amazon Fosi Audio  
Fosi Audio BT20A Bluetooth 5.0 Stereo Audio 2 Channel Amplifier Receiver Mini Hi-Fi Class D Integrated Amp 2.0 CH for Home Speakers 100W x 2 with Bass and Treble Control TPA3116 (with Power Supply)
2 Channel Amplifier: The BT20A Mini Bluetooth amplifier home audio offers both Bluetooth and RCA inputs, along with passive speaker outputs. This versatile amplifier enables you to build a high-quality 2.0-channel audio system, allowing seamless connections to your phone, computer, tablet, and more.
Bass and Treble Control: The Fosi Audio BT20A stereo amplifier is tailor-made for audiophiles seeking exceptional HiFi sound quality. You have control over the sound of your bookshelf speakers through music or video software, fine-tuning the bass and treble to your preferences.
Bluetooth 5.0 Amplifier: Featuring two Texas Instruments TPA3116D2 chips, the BT20A delivers powerful and clear stereo sound. The TPA3116D2 is a highly efficient digital amplifier with an advanced oscillator/PLL circuit, ensuring minimal interference and offering a robust connection range of up to 50 feet.
The Ideal Partner Amplifier For Speakers: With an impressive 100W RMS per channel at 4 ohms, 20 Hz - 20 kHz, and only 0.04% THD, the BT20A Bluetooth amp is a powerhouse. It comes with a 24V power supply and can drive speakers with a capacity of 280 watts at 8 ohms or 320 watts at 4 ohms. (for passive speakers only, not the powered speakers)
What You'll Get: BT20A stereo audio amplifier receiver x1, 24V/4.5A power supply x1, User Manual x1, a 24-month worry-free warranty and responsive customer service.
Fosi Audio BT20A Bluetooth 5.0 Stereo Audio 2 Channel Amplifier Receiver Mini Hi
Amazon Fanmusic  
Topping E50 MQA Full DAC ES9068AS XU216 32Bit/768kHz DSD512 PCM768kHz Decoder RCA TRS Ultra Low Noise Preamp (Silver)
ES9068AS DAC Chip--- E50 uses the latest high-performance DAC chip ES9068AS. Our excellence in design and engineering provides realistic and transparent sound quality.
The sound quality is good enough for all kinds of applications--- With the help of careful design and adjustment, E50 provides a distortion as low as 0.00009% and a dynamic range of 126dB, providing you with perfect sound quality. This also makes E50 suitable for applications: high-fidelity PC-HIFI system, mobile phone/tablet OTG, CD player/turntable external DAC, digital broadcasting external DAC, TV DAC, and so on.
Ultra-low jitter for USB inputs, jitter is no longer anxious--- Using CPLD to process the clock and greatly optimize the digital signal, achieved incredible jitter suppression capabilities. The use of new technology makes the femtosecond crystal and external clock no longer needed to suppress jitter.
5V power supply, anytime and anywhere--- E50 uses a DC5V power supply, which can be easily accessed almost everywhere. You can power it up by USB port of PC, mobile phone charger or even a power bank. Note: The product does not provide a 5V power adapter.
All inputs support Auto On/Off function--- E50 auto On/Off function, it will automatically turn on and set to the input which the signal is valid. And when the signal of E50's selection is not valid for 1 minute, E50 will turn off automatically.
Topping E50 MQA Full DAC ES9068AS XU216 32Bit/768kHz DSD512 PCM768kHz Decoder RC
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