new setup for my envoy

[Matt A 10+ year member]

hey everyone....i have a 2005 envoy with a fairly good amount of electrical work....a 250 amp alt, 0 gauge wire throughout, and 2 batteries.... i wanna upgrade my current system which is 2 aq hdc3 15s and a aq3500d.... i was considering putting in a wall for 4 15s and add another 3500d and 2 more batteries but im not sure how much airspace a typical envoy has...should i wall of the envoy with 4 15s or just go with 4 12s and no wall?....i want maximum spl with decent sq but i want the system to be efficient in every way possible...thanks for your help

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