Just a guess here: This sub has a dual voice coil (right and left channels). The 4 wire cable has +/- for the right side and the left side. The amp for the sub is built into the sony. If it is this way, you could easily hook up any "passive" (non powered) sub. It could probably attach to a powered sub also, just make sure you use the speaker level inputs and not into the rca jacks.
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