I currently have two Infinity Reference subs running off a Kicker 550.3 (400 RMS at 2 ohms on the sub channel). Infinity's are 300RMS each. I'm planning on upgrading to a single Dual 4 ohm Kappa Perfect 12.1 (350 RMS) for SQ purposes, but will it hit as hard or a little better than the Reference subs and will it do ok with 400 RMS? The References are underpowered and are currently in a small sealed box (smaller than the recommended size, 1.0 cu ft per sub). Please no recommendations on other subs as I like the SQ and don't want another, just wandering how hard it'll hit in a car