By doing a test through this video https://youtu.be/M8gjsefNYpE I found my Bose SoundTouch 300 stop responding below 43Hz. When I connected it to a Accustimas 300 subwoofer, the sound reduced the volume from 56Hz to 42Hz then increases below 42Hz.
I strongly suspect Bose cancelled sound output below 56Hz on SoundTouch 300 when you connect to a subwoofer. However, the subwoofer cannot respond around 50Hz which is disappointing which makes no speaker component respond the gap of frequency in the system.
Any idea how to fix it? Or a way to adjust from the app?