1999-2006 GM Sierra Extended Cab Dual Sub Box with Amp Rack
1999-2006 GM Sierra Extended Cab Dual Sub Box with Amp Rack

1999-2006 GM Sierra Extended Cab Dual Sub Box with Amp Rack

Xtreme EnclosuresCustom Built: Estimated lead time of 20-40 Business days.
SKU: GMEC9906 DUAL AMP RACK In Stock
Regular price$323.70

A one-piece dual sub box with an amp rack built into the center, for the 1999-2006 GM Sierra and Chevrolet Silverado extended cab. It mounts under the rear seat and takes two 8", two 10" or two 12" subwoofers sharing 1.3 cu ft of airspace.

Fits

  • GM Sierra extended cab, 1999-2006
  • Chevrolet Silverado extended cab, 1999-2006
  • Mounts under the rear seat
  • This listing is the whole box with the amp rack; the version without a rack and the split pair are separate products

Specs

Subwoofers Two 8", two 10" or two 12"
Airspace 1.3 cu ft total, shared by both subs
Mounting depth 7" with dual 10" subs, 6.75" with dual 12" subs
Cutouts Standard: 7" for 8s, 9 1/8" for 10s, 11 1/8" for 12s
Terminals Speaker terminals included
Included Amplifier rack in the center of the box

Choosing your subs

Check your subs against the depth for their size (7" for 10s, 6.75" for 12s) and the 1.3 cu ft shared airspace, and compare their cutout with the figures above. Type the sub model in the "What Sub Model are you using?" box when ordering so the holes are cut to match; the builder can look up the specs from the model. Shop 8" subwoofers, 10" subwoofers or 12" subwoofers.

Built to order

Built to order by Xtreme Enclosures: CNC cut, assembled and carpeted. Estimated lead time: 20–40 business days.

Questions before you order? Call SSA at (443) 345-1537 or email support@soundsolutionsaudio.com.

Sale Ends November 19th, 2026
Minimum Purchase of $349.00
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A one-piece dual sub box with an amp rack built into the center, for the 1999-2006 GM Sierra and Chevrolet Silverado extended cab. It mounts under the rear seat and takes two 8", two 10" or two 12" subwoofers sharing 1.3 cu ft of airspace.

Fits

  • GM Sierra extended cab, 1999-2006
  • Chevrolet Silverado extended cab, 1999-2006
  • Mounts under the rear seat
  • This listing is the whole box with the amp rack; the version without a rack and the split pair are separate products

Specs

Subwoofers Two 8", two 10" or two 12"
Airspace 1.3 cu ft total, shared by both subs
Mounting depth 7" with dual 10" subs, 6.75" with dual 12" subs
Cutouts Standard: 7" for 8s, 9 1/8" for 10s, 11 1/8" for 12s
Terminals Speaker terminals included
Included Amplifier rack in the center of the box

Choosing your subs

Check your subs against the depth for their size (7" for 10s, 6.75" for 12s) and the 1.3 cu ft shared airspace, and compare their cutout with the figures above. Type the sub model in the "What Sub Model are you using?" box when ordering so the holes are cut to match; the builder can look up the specs from the model. Shop 8" subwoofers, 10" subwoofers or 12" subwoofers.

Built to order

Built to order by Xtreme Enclosures: CNC cut, assembled and carpeted. Estimated lead time: 20–40 business days.

Questions before you order? Call SSA at (443) 345-1537 or email support@soundsolutionsaudio.com.

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We accept payments with :
Visa, MasterCard, American Express, Paypal, Diners Club, Discover and more.

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

We accept payments with :
Visa, MasterCard, American Express, Paypal, Diners Club, Discover and more.

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