<![CDATA[Sound Off Audio, Inc.: New Products - SIERRA EXTENDED CAB]]> https://www.soundoffaudio.com Sun, 05 Apr 2026 13:33:57 +0000 <![CDATA[1999-2006 Silverado Ext. Cab Quad 8" Vented Box]]> https://www.soundoffaudio.com/1999-2006-silverado-ext-cab-quad-8-vented-box/ Thu, 06 Apr 2017 17:22:57 +0000 https://www.soundoffaudio.com/1999-2006-silverado-ext-cab-quad-8-vented-box/ 1999-2006 Silverado Ext. Cab Quad 8" Vented Box

This is probably one of the loudest setups you can have in this truck.

4 8S UNDER THIS SEAT IS CRAZY LOUD. WE BRACE AND GLUE THESE BOXES TO MAKE SURE YOU GET YOUR MONEYS WORTH.

WE CUSTOM TUNE EACH ONE AND HAVE NOTHING BUT STELLAR REVIEWS OF THIS BOX.

This box fits 99-06 ..

Price: $349.00

]]> 1999-2006 Silverado Ext. Cab Quad 8" Vented Box

This is probably one of the loudest setups you can have in this truck.

4 8S UNDER THIS SEAT IS CRAZY LOUD. WE BRACE AND GLUE THESE BOXES TO MAKE SURE YOU GET YOUR MONEYS WORTH.

WE CUSTOM TUNE EACH ONE AND HAVE NOTHING BUT STELLAR REVIEWS OF THIS BOX.

This box fits 99-06 ..

Price: $349.00

]]> This is probably one of the loudest setups you can have in this truck.

4 8S UNDER THIS SEAT IS CRAZY LOUD. WE BRACE AND GLUE THESE BOXES TO MAKE SURE YOU GET YOUR MONEYS WORTH.

WE CUSTOM TUNE EACH ONE AND HAVE NOTHING BUT STELLAR REVIEWS OF THIS BOX.

This box fits 99-06 ..]]> <![CDATA[1999-2006 Silverado Ext. Cab Quad 8" Vented Box]]> https://www.soundoffaudio.com/1999-2006-silverado-ext-cab-quad-8-vented-box/ Thu, 06 Apr 2017 17:22:57 +0000 https://www.soundoffaudio.com/1999-2006-silverado-ext-cab-quad-8-vented-box/ 1999-2006 Silverado Ext. Cab Quad 8" Vented Box

This is probably one of the loudest setups you can have in this truck.

4 8S UNDER THIS SEAT IS CRAZY LOUD. WE BRACE AND GLUE THESE BOXES TO MAKE SURE YOU GET YOUR MONEYS WORTH.

WE CUSTOM TUNE EACH ONE AND HAVE NOTHING BUT STELLAR REVIEWS OF THIS BOX.

This box fits 99-06 ..

Price: $349.00

]]> 1999-2006 Silverado Ext. Cab Quad 8" Vented Box

This is probably one of the loudest setups you can have in this truck.

4 8S UNDER THIS SEAT IS CRAZY LOUD. WE BRACE AND GLUE THESE BOXES TO MAKE SURE YOU GET YOUR MONEYS WORTH.

WE CUSTOM TUNE EACH ONE AND HAVE NOTHING BUT STELLAR REVIEWS OF THIS BOX.

This box fits 99-06 ..

Price: $349.00

]]> This is probably one of the loudest setups you can have in this truck.

4 8S UNDER THIS SEAT IS CRAZY LOUD. WE BRACE AND GLUE THESE BOXES TO MAKE SURE YOU GET YOUR MONEYS WORTH.

WE CUSTOM TUNE EACH ONE AND HAVE NOTHING BUT STELLAR REVIEWS OF THIS BOX.

This box fits 99-06 ..]]> <![CDATA[2003-2006 GMC Sierra 1500 non-HD Console Enclosure]]> https://www.soundoffaudio.com/2003-2006-gmc-sierra-1500-non-hd-console-enclosure/ Mon, 28 Sep 2015 08:29:20 +0000 https://www.soundoffaudio.com/2003-2006-gmc-sierra-1500-non-hd-console-enclosure/ 2003-2006 GMC Sierra 1500 non-HD Console Enclosure

Fits:

  • 2003-2006 Chevrolet Silverado 1/2 Ton (1500 series) Crew, Standard and Extended Cabs
  • 2003-2006 GMC Sierra 1/2 Ton (1500 series) Crew, Standard and Extended Cabs

Might fit the HD series 2500 and 3500 if the seat style is the same.  Email or call us ..

Price: $299.00

]]> 2003-2006 GMC Sierra 1500 non-HD Console Enclosure

Fits:

  • 2003-2006 Chevrolet Silverado 1/2 Ton (1500 series) Crew, Standard and Extended Cabs
  • 2003-2006 GMC Sierra 1/2 Ton (1500 series) Crew, Standard and Extended Cabs

Might fit the HD series 2500 and 3500 if the seat style is the same.  Email or call us ..

Price: $299.00

]]> Fits:

  • 2003-2006 Chevrolet Silverado 1/2 Ton (1500 series) Crew, Standard and Extended Cabs
  • 2003-2006 GMC Sierra 1/2 Ton (1500 series) Crew, Standard and Extended Cabs

Might fit the HD series 2500 and 3500 if the seat style is the same.  Email or call us ..]]> <![CDATA[2003-2006 GMC Sierra 1500 non-HD Console Enclosure]]> https://www.soundoffaudio.com/2003-2006-gmc-sierra-1500-non-hd-console-enclosure/ Mon, 28 Sep 2015 08:29:20 +0000 https://www.soundoffaudio.com/2003-2006-gmc-sierra-1500-non-hd-console-enclosure/ 2003-2006 GMC Sierra 1500 non-HD Console Enclosure

Fits:

  • 2003-2006 Chevrolet Silverado 1/2 Ton (1500 series) Crew, Standard and Extended Cabs
  • 2003-2006 GMC Sierra 1/2 Ton (1500 series) Crew, Standard and Extended Cabs

Might fit the HD series 2500 and 3500 if the seat style is the same.  Email or call us ..

Price: $299.00

]]> 2003-2006 GMC Sierra 1500 non-HD Console Enclosure

Fits:

  • 2003-2006 Chevrolet Silverado 1/2 Ton (1500 series) Crew, Standard and Extended Cabs
  • 2003-2006 GMC Sierra 1/2 Ton (1500 series) Crew, Standard and Extended Cabs

Might fit the HD series 2500 and 3500 if the seat style is the same.  Email or call us ..

Price: $299.00

]]> Fits:

  • 2003-2006 Chevrolet Silverado 1/2 Ton (1500 series) Crew, Standard and Extended Cabs
  • 2003-2006 GMC Sierra 1/2 Ton (1500 series) Crew, Standard and Extended Cabs

Might fit the HD series 2500 and 3500 if the seat style is the same.  Email or call us ..]]> <![CDATA[Dual Sub Box 1988-1998 GMC Sierra Extended Cab]]> https://www.soundoffaudio.com/dual-sub-box-1988-1998-gmc-sierra-extended-cab/ Thu, 07 Aug 2014 14:04:25 +0000 https://www.soundoffaudio.com/dual-sub-box-1988-1998-gmc-sierra-extended-cab/ Dual Sub Box 1988-1998 GMC Sierra Extended Cab

  • Fits 8 or 10 inch subwoofers
  • MDF construction
  • Subs fire down
  • Fits under rear seat
  • Jack removal is required
    • <..

    Price: $239.00

    ]]> Dual Sub Box 1988-1998 GMC Sierra Extended Cab
    • Fits 8 or 10 inch subwoofers
    • MDF construction
    • Subs fire down
    • Fits under rear seat
    • Jack removal is required
      • <..

      Price: $239.00

      ]]>
    • Fits 8 or 10 inch subwoofers
    • MDF construction
    • Subs fire down
    • Fits under rear seat
    • Jack removal is required
      • <..]]>       <![CDATA[Dual Sub Box 1988-1998 GMC Sierra Extended Cab]]> https://www.soundoffaudio.com/dual-sub-box-1988-1998-gmc-sierra-extended-cab/ Thu, 07 Aug 2014 14:04:25 +0000 https://www.soundoffaudio.com/dual-sub-box-1988-1998-gmc-sierra-extended-cab/ Dual Sub Box 1988-1998 GMC Sierra Extended Cab
      • Fits 8 or 10 inch subwoofers
      • MDF construction
      • Subs fire down
      • Fits under rear seat
      • Jack removal is required
        • <..

        Price: $239.00

        ]]> Dual Sub Box 1988-1998 GMC Sierra Extended Cab
        • Fits 8 or 10 inch subwoofers
        • MDF construction
        • Subs fire down
        • Fits under rear seat
        • Jack removal is required
          • <..

          Price: $239.00

          ]]>
        • Fits 8 or 10 inch subwoofers
        • MDF construction
        • Subs fire down
        • Fits under rear seat
        • Jack removal is required
          • <..]]>           <![CDATA[PORTED DUAL 8 BOX - 1999-2006 GMC SIERRA EXTENDED CAB]]> https://www.soundoffaudio.com/ported-dual-8-box-1999-2006-gmc-sierra-extended-cab/ Wed, 06 Aug 2014 17:35:28 +0000 https://www.soundoffaudio.com/ported-dual-8-box-1999-2006-gmc-sierra-extended-cab/ PORTED DUAL 8 BOX - 1999-2006 GMC SIERRA EXTENDED CAB

          1999-2006 GMC SIERRA EXTENDED CABS

          • Vented box
          • Fits dual 8 inch subwoofers
          • Mounting depth = 7 inches
          • Air Space = 1.7 cubic ft
          • Tuned to 35hz
          • MDF wood
          • Charcoal carpet
          • Available in OEM colors
          • choose which side of r..

            Price: $279.00

            ]]> PORTED DUAL 8 BOX - 1999-2006 GMC SIERRA EXTENDED CAB

            1999-2006 GMC SIERRA EXTENDED CABS

            • Vented box
            • Fits dual 8 inch subwoofers
            • Mounting depth = 7 inches
            • Air Space = 1.7 cubic ft
            • Tuned to 35hz
            • MDF wood
            • Charcoal carpet
            • Available in OEM colors
            • choose which side of r..

              Price: $279.00

              ]]> 1999-2006 GMC SIERRA EXTENDED CABS

              • Vented box
              • Fits dual 8 inch subwoofers
              • Mounting depth = 7 inches
              • Air Space = 1.7 cubic ft
              • Tuned to 35hz
              • MDF wood
              • Charcoal carpet
              • Available in OEM colors
              • choose which side of r..]]> <![CDATA[PORTED DUAL 8 BOX - 1999-2006 GMC SIERRA EXTENDED CAB]]> https://www.soundoffaudio.com/ported-dual-8-box-1999-2006-gmc-sierra-extended-cab/ Wed, 06 Aug 2014 17:35:28 +0000 https://www.soundoffaudio.com/ported-dual-8-box-1999-2006-gmc-sierra-extended-cab/ PORTED DUAL 8 BOX - 1999-2006 GMC SIERRA EXTENDED CAB

                1999-2006 GMC SIERRA EXTENDED CABS

                • Vented box
                • Fits dual 8 inch subwoofers
                • Mounting depth = 7 inches
                • Air Space = 1.7 cubic ft
                • Tuned to 35hz
                • MDF wood
                • Charcoal carpet
                • Available in OEM colors
                • choose which side of r..

                  Price: $279.00

                  ]]> PORTED DUAL 8 BOX - 1999-2006 GMC SIERRA EXTENDED CAB

                  1999-2006 GMC SIERRA EXTENDED CABS

                  • Vented box
                  • Fits dual 8 inch subwoofers
                  • Mounting depth = 7 inches
                  • Air Space = 1.7 cubic ft
                  • Tuned to 35hz
                  • MDF wood
                  • Charcoal carpet
                  • Available in OEM colors
                  • choose which side of r..

                    Price: $279.00

                    ]]> 1999-2006 GMC SIERRA EXTENDED CABS

                    • Vented box
                    • Fits dual 8 inch subwoofers
                    • Mounting depth = 7 inches
                    • Air Space = 1.7 cubic ft
                    • Tuned to 35hz
                    • MDF wood
                    • Charcoal carpet
                    • Available in OEM colors
                    • choose which side of r..]]> <![CDATA[SINGLE SUB BOX 2007-2013 GMC SIERRA EXT CAB]]> https://www.soundoffaudio.com/single-sub-box-2007-2013-gmc-sierra-ext-cab/ Wed, 20 Nov 2013 14:07:44 +0000 https://www.soundoffaudio.com/single-sub-box-2007-2013-gmc-sierra-ext-cab/ SINGLE SUB BOX 2007-2013 GMC SIERRA EXT CAB

                      Fits 2007-2013 Chevy Silverado Extended Cab and GMC Sierra Extended Cab trucks

                      • Fits single 8 inch, 10 inch, and 12 inch subwoofer
                      • Subwoofer fires down
                      • 5/8 inch MDF
                      • Air space = .6 cubic ft per sub
                      • Mounting depth for 8 inch sub = 6 inches
                      • ..

                        Price: $199.00

                        ]]> SINGLE SUB BOX 2007-2013 GMC SIERRA EXT CAB

                        Fits 2007-2013 Chevy Silverado Extended Cab and GMC Sierra Extended Cab trucks

                        • Fits single 8 inch, 10 inch, and 12 inch subwoofer
                        • Subwoofer fires down
                        • 5/8 inch MDF
                        • Air space = .6 cubic ft per sub
                        • Mounting depth for 8 inch sub = 6 inches
                        • ..

                          Price: $199.00

                          ]]> Fits 2007-2013 Chevy Silverado Extended Cab and GMC Sierra Extended Cab trucks

                          • Fits single 8 inch, 10 inch, and 12 inch subwoofer
                          • Subwoofer fires down
                          • 5/8 inch MDF
                          • Air space = .6 cubic ft per sub
                          • Mounting depth for 8 inch sub = 6 inches
                          • ..]]> <![CDATA[SINGLE SUB BOX 2007-2013 GMC SIERRA EXT CAB]]> https://www.soundoffaudio.com/single-sub-box-2007-2013-gmc-sierra-ext-cab/ Wed, 20 Nov 2013 14:07:44 +0000 https://www.soundoffaudio.com/single-sub-box-2007-2013-gmc-sierra-ext-cab/ SINGLE SUB BOX 2007-2013 GMC SIERRA EXT CAB

                            Fits 2007-2013 Chevy Silverado Extended Cab and GMC Sierra Extended Cab trucks

                            • Fits single 8 inch, 10 inch, and 12 inch subwoofer
                            • Subwoofer fires down
                            • 5/8 inch MDF
                            • Air space = .6 cubic ft per sub
                            • Mounting depth for 8 inch sub = 6 inches
                            • ..

                              Price: $199.00

                              ]]> SINGLE SUB BOX 2007-2013 GMC SIERRA EXT CAB

                              Fits 2007-2013 Chevy Silverado Extended Cab and GMC Sierra Extended Cab trucks

                              • Fits single 8 inch, 10 inch, and 12 inch subwoofer
                              • Subwoofer fires down
                              • 5/8 inch MDF
                              • Air space = .6 cubic ft per sub
                              • Mounting depth for 8 inch sub = 6 inches
                              • ..

                                Price: $199.00

                                ]]> Fits 2007-2013 Chevy Silverado Extended Cab and GMC Sierra Extended Cab trucks

                                • Fits single 8 inch, 10 inch, and 12 inch subwoofer
                                • Subwoofer fires down
                                • 5/8 inch MDF
                                • Air space = .6 cubic ft per sub
                                • Mounting depth for 8 inch sub = 6 inches
                                • ..]]>