Sali Arana, you can do that without any problem if you want to. I am currently experiencing that the SB 900 has a lot of bang, and I haven't even turned the bass tap all the way up. the room to be sounded is a gallery of about 25 m2 and between 2 and 4 metres high with two hatches, so there are enough angles, furniture, stairs, doors that absorb bass. Thanks to the perfect sounding of the room with the Bose adapting, I have the same great sound in the whole room, whether from the TV or from Spotify. I suggest before you go to any more trouble than necessary, try the SB in your room and then decide if you want more bang.

Hello Arana1986

Yes, you can connect Bose bass module 300 to Bose soundbar 900. All these Bose items 300 500 700 and 900 work together. I have Bose boxes 500, Bose bass module 700 and Bose soundbar 900 everything works tip-top with each other.