The D300B's RCA connectors are gold-plated for greater durability. The amplifier chip is flush with the chassis for heat dissipation, providing a larger heat dissipation area and significantly better cooling than an internal heatsink, allowing for stable operation over extended periods. The LPF circuit uses German WIMA capacitors, and the coupling section uses high-grade ELNA capacitors-all audiophile-grade materials. The op-amp is an IRC5532; you can replace it with a more high-end op-amp for even better performance. The amplifier chip is a Texas Instruments TPA3255, capable of outputting 300W of powerful power per channel, easily driving various large speakers-a true powerhouse. The Bluetooth module used is the OCC3084, supporting LDAC lossless transmission. The Bluetooth decoder uses the PCM5102, resulting in superior audio quality compared to wired transmission. The USB input utilizes the OCC3084 module's receiver function, supporting a bitrate of 96K24bit, offering outstanding performance. Product Model: D300B Input Method: RCA, Bluetooth (BT), USB Amplifier Chip: TPA3255*1 Bluetooth Version: Bluetooth 5.4 Frequency Response: 20-20K@1KHZ±0.3DB Power Supply: DC24V-48V (Power supply not included) DC Power Socket Size: 5.5*2.5mm Bluetooth Chip: QCC3084 Bluetooth Support: SBC/AAC/APTX/APTX-LL/LDAC 16-24BIT 44.1-96KHZ USB Support: PCM 24BIT 96K Bluetooth Decoding Chip: PCM5102 Output Power: 300W*2/42, measured at 48V Total Harmonic Distortion: 0.5% Protection Mechanism: Reverse polarity protection, short circuit protection, self-recovering overheat protection Color: Black Material: Aluminum Alloy Package Contents: 1 * Digital Amplifier