Short Description: ZK-PRO2 Fever Pre Stage Tone Board – 2.1 Channel with Qualcomm QCC3034 Bluetooth 5.0 + ES9023 DAC delivers lossless high-fidelity audio, professional tone control, and powerful subwoofer management. Ideal for DIY 2.1 Hi-Fi amplifiers, home theater, and fever-grade karaoke systems...