Its an 8 speaker set up all hooked up to a small amp, you can by radio adaptors to convert the existing radio loom to fit all modern din radios and the loom also has 4 RCAs that you can hook up to your preouts on you head unit so you can take full advantage of the active system, i left mine in as it sounds pretty good to me, there is 2 subs behind you one on the drivers side and passenger side they sit on the floor you have 2 speakers behind you by your head rest, and you have 2 speakers on each door.
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.well i say speakers one is a tweeter, all in all it sounds awesome with the right headunit