2007-2013 GMC Sierra Extended Cab Sub Box Double Sealed


2007-2013 GMC Sierra Extended Cab Sub Box Double Sealed

­The 2007-2013 GMC Sierra Extended Cab offers some difficult challenges of it’s own. The space under the seat is tall, but it changes floor levels 3 times and each side of the transmission tunnel is different. As the floor goes up the mounting depth goes down. The box I have designed is 1.2cuft total with .5” of mounting depth for 10s and 5.25” for 12s with an included double bump of 3/4” MDF and a steel plate on top. I prefer to do my added depth this way instead of building a little box on top of the box. That little box is just more joints to go bad and fail. My double bump may cost a few bucks more but it is bullet proof.

This is a sealed subwoofer box. A sealed subwoofer box has a tight and punchy bass that is more articulate and more true to the music with a more natural sound. For customers who want louder deeper bass with the lower bass more pronounced. Because of the ported design, the bass will not be as tight and punchy, but there is double the bass of a sealed box with the same subs. If big bass is what you want then our ported box will be what you want.

This box is made out of 3/4″ MDF and is fully carpeted in matching carpet. The nickle plated spring loaded speaker terminals are mounted on the back of the box and the speaker wires are soldered on for a solid and reliable connection.

Chevy / GMC Gallery

Contact Us About Your Options (This is only if your order requires some advanced customization. If you need a customization fee, we’ll let you know).

  • We use Stinger wire on all of our boxes.
  • Please enter the Brand and Model of the subwoofers you will be using.
  • $0.00

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Additional information

Weight 46 lbs
Dimensions 54.75 × 12.875 × 10.25 in
Total Volume (CuFt)

Mounting Depth

Fit Location


Box Finish

Number of Speakers

Speaker Sizes