Yes you could, you dont need many watts at all because you will be doing nearfield listening. For a sub, you would need to connect it to the speakers using the speaker-level connections. Some small amps do have line-level connections for subs, but they are going to be $100 minimum.
Samsung PN60F5300 | Denon DBP-1611 | Roku 3
Denon AVR-1713 | EMP E55Ti | EMP E56Ci | EMP E5Bi | BIC F-12
Topping TP23 | NHT SuperZero 2.0 | Velodyne DEQ-8R