Best configuration for my subwoofer setup

[Sizzlechest]

I recently installed a subwoofer using my factory radio with a MTX Re-Q in my Subaru BRZ. I am still trying to decide on the best handling of the high-level signal from the radio. I also bought a Sound Storm SX310 crossover, which I'd like to use but I do not want to over-process the signal and decrease quality.

When I originally purchased the crossover it was my assumption that the factory amp was fed by a low-level signal from the factory headunit. It turns out it's actually high-level so I had to incorporate the MTX Re-Q.

Which of these sounds better for optimal performance\quality:

1. Use only the MTX Re-Q with the subwoofer outs going to my subwoofer amp. The Re-Q has gain, subsonic, and low-pass crossover adjustability.

2. Use the MTX Re-Q with the front-speaker outs (full-range signal) going to my crossover and then to my subwoofer amp. My thought is the crossover may be better at processing the signal and has more adjustability than the Re-Q (frequency, bass boost, phase, 8V pre-out?.. see above spec sheet).

3. Use a passive non-powered LOC with the crossover.

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[CrossoverOre 10+ year member]

if you have the re q I would use that. I would also suggest that it gets connected as suggested in the manual. left right and sub input after amplification. If you still feel like you need more adjustment after that then add the sx310.

 

[Sizzlechest]

What does the before\after amplification mean? The manual doesnt get into much detail.