Connecting amp\sub to factory head unit

[Sizzlechest]

I have a 2013 Subaru BRZ. I want to connect an amp to my factory headunit that does not have amp pre-outs. The factory speakers do use factory amps (there's no factory sub).

My question is, I am considering getting the AudioControl LC2i, which uses the speaker outputs as inputs and converts/processes it to a pre-out signal to go to an amp.

But I was wondering if I had a better option since I technically do have a pre-out signal already.

1. Get a crossover/signal processor that will take the pre-outs tapped from my factory amp and convert it to a low signal for subs. I'm not sure if it would be better than using the AudioControl LC2i. I figured it would be better to process a pre-out signal instead of already amplified signal coming out of the factory amps. Any recommendations on signal processors like this?

2. Use AudioControl LC2i and feed it the speaker wires.

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[57hemi]

I ask crutchfields the same thing answer I got was the lc2i was the cheapest way. I bought it off amazon prime for $68 2 day shipping