![Amazon.com: Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics Amazon.com: Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics](https://m.media-amazon.com/images/I/61b4ZMcPpSL._AC_UF350,350_QL80_.jpg)
Amazon.com: Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics
![Amazon.com: Douk Audio U5 Headphone Amps, Mini Fully Balanced Amplifier for Home Desktop PC XLR / 4.4mm Headsets, DC 5V : Electronics Amazon.com: Douk Audio U5 Headphone Amps, Mini Fully Balanced Amplifier for Home Desktop PC XLR / 4.4mm Headsets, DC 5V : Electronics](https://m.media-amazon.com/images/I/41o7V2roNyL._AC_.jpg)
Amazon.com: Douk Audio U5 Headphone Amps, Mini Fully Balanced Amplifier for Home Desktop PC XLR / 4.4mm Headsets, DC 5V : Electronics
![Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics - Amazon.com Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics - Amazon.com](https://m.media-amazon.com/images/I/71u4+-NP0nL._AC_UF894,1000_QL80_.jpg)
Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics - Amazon.com
![Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL](https://ae01.alicdn.com/kf/Hafea9bc6d8c9455aa9ec3f376bba7039v.jpg_640x640q90.jpg)
Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL
![Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL](https://ae01.alicdn.com/kf/Sd32aca635b814fa5874a494c4df28489L/Douk-Audio-U4-Mini-Bluetooth-5-0-Tube-Headphone-Amplifier-USB-DAC-Stereo-Audio-Preamp-USB.jpg)
Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL
![Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL](https://ae01.alicdn.com/kf/H1edb34613efc41ec8ccdc649a1ab9b84h.jpg_640x640q90.jpg)
Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL
![Amazon.com: Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics Amazon.com: Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics](https://m.media-amazon.com/images/I/51VANpJLHiS._AC_UF894,1000_QL80_.jpg)
Amazon.com: Douk Audio G4 Subwoofer Full-Frequency Mono Channel Digital Power Amplifier 100W : Electronics
![Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL](https://ae01.alicdn.com/kf/Sc76afabc6a064850afa209dfcab67078n/Douk-Audio-U4-Mini-Bluetooth-5-0-Tube-Headphone-Amplifier-USB-DAC-Stereo-Audio-Preamp-USB.jpg)
Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL
![Douk Audio G4 Mini Subwoofer / Full-Frequency Mono Channel Digital Amplifier HiFi Audio 100W Home Desktop Power Amp Douk Audio G4 Mini Subwoofer / Full-Frequency Mono Channel Digital Amplifier HiFi Audio 100W Home Desktop Power Amp](https://ae01.alicdn.com/kf/S86b8f904776d4118ad431d69ecb7af9cC.jpg?width=1600&height=1600&hash=3200)
Douk Audio G4 Mini Subwoofer / Full-Frequency Mono Channel Digital Amplifier HiFi Audio 100W Home Desktop Power Amp
![Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL Douk Audio U4 Mini Bluetooth 5.0 Tube Headphone Amplifier USB DAC Stereo Audio Preamp USB Sound Card APTX-LL](https://ae01.alicdn.com/kf/Sbb99bb05ff8a4b98895c74ae076402ed9/Douk-Audio-U4-Mini-Bluetooth-5-0-Tube-Headphone-Amplifier-USB-DAC-Stereo-Audio-Preamp-USB.jpg)