kick speaker locations are great for improving path length differences (PLD's). it's locating the tweeter down there that is an issue with your legs and sound stage height. but seriously, the leg argument is invalid because door speakers are awful locations due to your knee and the plastic factory grill also.
doors are great for volume and midbass though. kick speakers are a lot more involved than a $150
pr of q-logic plastic panels. you need to reinforce the plastic frame with fiberglass (inside) for strength, you need to cut away factory carpet and metal to reveal a volume for the speaker to play into, as well as ensuring you have an airtight seal.
the only way i'd use the q-logic panels would be for a pretty grill cover that fits over custom kicks. or in conjunction with door midbass so you only need a smaller midrange in the kicks (thus less issues with strength and airspace).
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