Maximum Sealed Box Volume 0.85 cubic feet. 2 rockford fosgate punch p3d4-12 12 2400 watt dual 4 ohm car subwoofers subs speaker cutout 11.25 inches. If you want to return your item within the first 30 days of when it was delivered to you you have the following options. Minimum Sealed Box Volume 0.50 cubic feet.