aq hdc3 15" vs. 6 12" ma audio xe

[RAB 10+ year member]

i have 2 hdc315s in my car but really cant fit anymore 15s" or 18".so i came to a conclusion that i could fit 6 12" in a sealed box facing up.do yall think it be louder with the 12s or keep what i have

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[Lakota 5,000+ posts]

This is really a bad comparison, imo. If you're not satisfied with those two 15's then maybe you need to look into how they are setup.