if you are to use the zigma hornet then you need a sub but for my case i don't , my dca 4" are in a non fold horn (consider big) , the dca 4" sound better than the jordan JX 92 but you can't play them that loud, very natural sounding driver with 91dB, i play them with SE 2a3, SE double darling, 832 PP 6 watts and charlize T amp 10 watts

zeno