you're only going to add midbass ... just so you understand that and since you have infinity system you're still going to go through the amp so the crossovers are set for the infinity speakers ... so even putting in some alpines you won't gain THAT much midbass bc the factory system is still limiting the bass output .. what you need to do is just buy a small sub and amp ideally bc no speakers are going to give you enough lows .. . just midbass
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