Re kirsch...k-10 subwoofer?

Question

the speakers that came with it are garbage...so as I said I hooked up 4 late 1990's Sony 3 way tower speakers which have peak power off 200 watts each..

this K-10 Amp. subwoofer by kirsch is quite loud and the bass it pumps is more than enough for my condo, my neighbors have already complained and the bass was only at 20 and as I said I found the entire system...the speakers I threw out but kept this K-10 subwoofer...thank GOD I am not one of those people who would buy something out the back of a Van??? I have never seen anyone do that before...mind you if i did and they asked my to buy or even look at w/e they'd claim to have..I'd tell the guy to **** off