I'm running 2 Power Acoustik ****-154x subwoofers on and 2400 watt Brutus. They are in the trunk of a 2010 Charger. I've been told that the 15s are being Choked and the brand isn't the best anyway. So I'm deciding whether or no to keep the same system or go with 2 Sundown X-12s and strap another 2400 watt Brutus t my current one. I would go with a ported box tuned to 30hz. Possibly a bandpass but not sure. Suggestions?