I have a problem of connect Focusrite 2i2 to Bose S1Pro. On the back of the Bose speaker I connected TRS cable to output line but i don't know where to insert the other end of the TRS cable to Focusrite 2i2. I only have 1 Bose S1pro and would need help to set up the speaker to Focusrite 2i2. Thank you