This build is more of a working novelty than a practical project. It turned out better than expected really. I'm going to make something similar for an EV car using 2 6.5 inch subs in a small box in the rear, 10 18650 lithium ion batteries, amp built into the sub box with 2 full range pod speakers that run up front. This is basically a tiny version of a bigger thing I have coming up for a mini system in an EV.