Superzeros are good speakers, but they do need a sub probably crossed over at 80 to 100hz. However, I would guess that the Corsairs probably had a higher crossover like that, too (if not higher).
The Indeed t-amps will not have a subwoofer line out. Some subs like the PSW10 have speaker level inputs and outputs. One runs the speaker out from the amp to the sub, and then the speaker out on the sub to the speakers. Other subs (perhaps more than you want to spend) will have rca in/rca outs that let you run the output from your computer to the sub, and then connect the amp to the sub. That would mean then controlling the volume with your computer.