SQ without a subwoofer?

[eminem015]

sir, kung naka amp ka, there should be no voice sa subs unless mala ray langit boses ng singer.

voice coils... it just give you more options on how to wire the system. mas ok dual voice kung SPL gusto mo attain. more boom boom kasi sa 2 ohms rather than 6 ohms straight.

ahh.. nweiz, how would i know if mine is a dual coil or not? panu malalaman sa itsura ng subs?