BT30D supporting Bluetooth and RCA input can drive most home passive speakers, passive/powered subwoofer. SUB volume/Frequency, Bass/Treble control
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Fosi Audio BT30D PRO TPA3255 Subjective review
Fosi Audio BT30D Pro TPA3255 Hi-Fi Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Class D Integrated Amp 165 Watt x2+350 Watt for Home Outdoor Desktop Bookshelf Speakers/Subwoofers : Electronics
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Fosi Audio Box X4 Phono Preamp Headphone Amplifier/Preamplifier Hi-Fi
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