1988-1998 GMC Sierra Extended Cab Sub Box Dual Small Sealed


1988-1998 GMC Sierra Extended Cab Sub Box Dual Small Sealed­

The 1988-1998 GMC Sierra Extended Cab trucks gave birth to the under seat down fire box. This body style truck was the start of the sport truck movement and as around when car audio started it’s boom. The space under this rear seat is limited but there are ways to get plenty of sound out from under there. The tool box and jack storage is in the way, but once it is removed there is plenty of room to squeeze a couple of 10s under there. The box sticks out from the front of the seat a little bit but that is the only way to get anything with a decent surface area under there. The box is full width with 1.2cuft of airspace which is spot on for a couple of 10s with up to 5 3/8” of mounting depth.

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.
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Additional information

Weight 48 lbs
Dimensions 55 × 12.5 × 10.25 in
Total Volume (CuFt)

Mounting Depth

Fit Location


Box Finish

Number of Speakers

Speaker Sizes