First review? Purchased the XR12D4, I have a kicker CX1200.1 powering this sub and I’ll tell you what I couldn’t be happier! Such a warm and hard hitting sub. Tickles the ears and rumbles the throat. I currently have it in a 43hz 2.5 cubic foot box. Waiting on my tuned 32hz box from Sound solutions! It hits everything from The devil wear prada to exscision and hip hop! Highly recommend this subwoofer and for the price...come on!