I have an Aiyima A07 which I really like and would like to add a subwoofer into the mix. Is there a 2.1 unit with the TPA3255 in it that could provide the same power and signal to a pair of passive speakers and active subwoofer. If not, what's the best way to incorporate a subwoofer? My audio source and set up is as follows: Macbook pro > Aiyima Tube A3 Pro > Aiyima A07 > Bookshelf Speakers