1pc 2.1 Channel TPA3251D2 Bluetooth 5.1 S350H Sound Amplifier Board Module Model: S350H Chip: TPA3251D2 Power: 220W x 2 (satellites) + 350W (subwoofer) Inputs: Bluetooth 5.1, AUX Controls: Treble, Bass, Subwoofer level (onboard) Key benefits output for clean, powerful 2.1 sound: The module delivers 220W to each satellite and 350W to the subwoofer, enabling fullrange audio with a strong low end and clear highs. Modern wireless and wired connectivity: Bluetooth 5.1 provides stable wireless streaming from phones, tablets and laptops while the AUX input offers a reliable wired option for older sources. Built for DIY and system upgrades: A compact amplifier board that integrates treble, bass and subwoofer control, making it simple to tune sound for a room, home theater or custom speaker build. What this module solves Replaces weak integrated amps: Turn small or passive speakers into a power 2.1 system without buying a full amplifier enclosure. Simplifies speaker system building: Onboard tone controls and a dedicated subwoofer output let you balance satellites and bass without extra DSP hardware. Adds wireless streaming to legacy setups: Bluetooth 5.1 support brings modern streaming compatibility to existing audio sources. Key features and attributes Amplifier chip: TPA3251D2 (as specified in the product title), providing the core amplification stage. Channel configuration: 2.1 — two fullrange channels plus one subwoofer channel. Power ratings: 220W per satellite channel and 350W for the subwoofer channel (as listed). Connectivity: Bluetooth 5.1 for wireless audio; AUX input for wired sources. Tone controls: Treble and bass adjustment plus subwoofer level control built into the module for simple onsite tuning. Form factor: Board/module design intended for integration into DIY enclosures, speaker cabinets, or retrofitting projects. Build: Standard amplifier PCB with onboard controls and connectors (module form, supplied as a single piece). Compatibility and performance notes Intended for use with passive speakers and a passive subwoofer that can handle the stated power levels. Observe speaker impedance and powerhandling limits to avoid damage. used with a suitable power supply and proper cooling consistent with output operation. Bluetooth 5.1 provides improved stability and range compared with older Bluetooth versions; wired AUX remains available for sources that prefer a direct connection. Typical use cases Home theater upgrade: Power a 2.1 speaker arrangement for movies and music with strong bass and tuned treble/bass controls to match room acoustics. DIY speaker projects: Integrate the S350H board into custom cabinets to create a powerful 2.1 system without sourcing separate amp components. Media room or desktop audio: Add wireless streaming and power output to desktop or small mediaroom speaker systems for clearer sound and deeper bass. Practical tips Match speaker impedance and power ratings to the amplifier's output to ensure reliable operation. Provide adequate ventilation or a heatsink when using the module at output for extended periods. Use quality speaker wiring and secure connections for the sonic performance and safety. Package quantity 1pc amplifier board module (S350H) as described in the product title. This S350H 2.1 amplifier board offers a straightforward, power solution for anyone building or upgrading a 2.1 system who needs Bluetooth 5.1 streaming, AUX input, and onboard treble/bass/subwoofer controls, powered by the TPA3251D2 amplifier chip and rated at 220W x2 + 350W.