1pc 2.1 Channel TPA3251D2 Bluetooth 5.1 Sound Amplifier Board Module (S350H) — 220W x2 + 350W Overview This 2.1 channel amplifier board (model S350H) combines the TI TPA3251D2 power stage with Bluetooth 5.1 and AUX input to deliver power output for left/right speakers plus a dedicated subwoofer channel. It is designed for DIY audio systems, upgrades to passive speaker setups, and compact custom installations that need reliable, output amplification with treble and bass control. Key benefits — why you need it output for impactful sound: 220W per stereo channel plus 350W for a subwoofer provides clear, roomfilling performance for home theater, lofts, and small venues. Modern wireless convenience: Bluetooth 5.1 enables stable wireless streaming from phones, tablets, and computers without needing a separate receiver. Tone control and sub integration: Treble and bass controls plus a dedicated sub channel make it easier to tune sound for the room and speaker combination. Compact module for quick integration: The board form factor simplifies installation into speaker cabinets, AV racks, or DIY enclosures. Key features and attributes Model: S350H Amplifier chip: TPA3251D2 Channels: 2.1 (left, right, subwoofer) Power rating: 220W x2 (left/right) + 350W (subwoofer) Wireless: Bluetooth 5.1 for source playback Inputs: AUX (linelevel) plus Bluetooth wireless input Tone control: Treble and bass adjustment for system tuning Form factor: Board/module designed for easy integration (1pc included) Performance and functionality efficiency amplification: Uses the TPA3251D2 power stage to deliver output while maintaining efficiency and thermal performance for long listening sessions. Dedicated sub output: Builtin subwoofer channel allows tight lowfrequency control without sacrificing stereo separation. Flexible source options: Use Bluetooth 5.1 for wireless playback or connect a linelevel device via the AUX input for lowlatency, wired audio. Practical controls: Onboard treble and bass adjustments make it simple to adapt the tonal balance to different rooms and speakers. Compatibility Designed for passive speakers and a passive/active subwoofer (as applicable to your wiring and crossover choices). Works with Bluetoothcapable devices (smartphones, tablets, laptops) and any device with a linelevel output through AUX. Intended for integration into custom enclosures, AV setups, or retrofit projects where a power 2.1 amplifier module is required. Typical use cases Home theater upgrade: Drive a pair of passive mains and a subwoofer from one compact module to add power and Bluetooth streaming to a livingroom AV system. DIY speaker projects: Integrate the S350H into custom speaker cabinets or active passive setups where a dedicated sub channel and tone control are needed. Small event or lounge audio: Provide powerful stereo and deep bass for storefronts, coffee shops, or small venues that require clear, output sound. What's included 1pc 2.1 Channel TPA3251D2 Bluetooth 5.1 Sound Amplifier Board Module (S350H) Notes and installation tips Ensure proper power supply capability and cooling when installing the module to meet its power requirements safely. Match speaker impedance and power handling to the amplifier's output ratings for performance. Use appropriate wiring and enclosures to prevent interference and to provide stable Bluetooth reception. This S350H amplifier board delivers a blend of output, modern wireless connectivity, and tone control in a compact module designed for integration into DIY and retrofit audio systems.