Reply to Subwoofer recommendation

Hey DJTT!

I have two studio monitors in my room to dj and produce with plus a pair of TMA-1 but i need a subwoofer. I looked but im not so much into it. It shouldnt be especially good just something really loud to impress the friends and preferably it should be active. Price shouldnt be much over 400 USD. But just as cheap as possibly!
Thanks!
-Elias Bille