1.2 Treble adjustment Provides adjustable frequency control to tailor the audio tone. Helps compensate for speaker response and room acoustics, improving clarity without introducing distortion. 2.1 Bluetooth audio power amplifier module with tone Integrated Bluetooth audio power amplification with built in tone shaping. Enables on board sound adjustment to suit different music styles and listening environments while driving two channel stereo output. 3.3 Bluetooth + AUX audio input Supports wireless streaming from Bluetooth enabled devices and wired input via AUX. Flexible connection options for phones, tablets, laptops, and other audio sources. 4.4 2.0 channel stereo output Delivers two channel stereo output suitable for standard stereo speakers. Simple integration for compact systems and DIY audio projects. Use scenarios DIY speaker upgrade: Add this module to a passive speaker project to create an active, Bluetoothenabled system. Use Bluetooth or AUX input and adjust treble to match your speakers for clearer highs and balanced sound. Home stereo enhancement: Retrofit an existing stereo setup by incorporating Bluetooth streaming and onboard tone control. Connect sources via Bluetooth or AUX, then fine tune treble for preferred listening style. Small home theater or computer audio: Use with compact speakers or computer audio setups to enable wireless playback from phones or PCs. The treble adjustment helps optimize clarity for dialog and music in a small room.