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Any amp only requires one pre out. So lets so you have 2 pre out, ok. You can use one to power a two channel amp for the subs. And use the other to power a 4 channel amp for your mids and highs.
But your only option right now is to use the one pre out for a 2 or 4 channel amp with you can use for just subs. Or use a 4 channel amp for all you mids and highs, or you could use a 4 channel to run the subs and the mids and highs.
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