You need the OS2 if you don't want to splice all the wires.
If you have the set up that I have your factory amp supports
fade control - when you fade the sound from front to back.
If you have the "dumb-amp" there is no fade control - you can
not fade the sound from front to back. You get the same volume level
all the time to all 6 speakers 2 in the front and the 4 in the
back.
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