I use to subwoofer in addition to 2 TEU-S15, for 2 years now and frankly it rocks grave until 200 people easily see a bit more.
For speakers I have an amp AudioPhony Traxion 800 and the subwoofer behringer 1200 watt amp bridged into 4 ohms.
No problem really, really deep bass and pure.
Negative side, I will not say much if not its weight, but good long live the muscle.
No problem, I would definitely buy the same, great value for money compared to what is happening in the market.