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Details about  Dual 12" Vented Subwoofer Box Fits 1500 Silverado Sierra Ext Cab 1999-2007

Dual 12" Vented Subwoofer Box Fits 1500 Silverado Sierra Ext Cab 1999-2007

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Last updated on  Oct 21, 2014 17:29:42 PDT  View all revisions

Item specifics

New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... Read moreabout the condition

Under Seat



Number of Ports:



5/8" USA MDF



Country of Manufacture:

United States




GMC Silverado Seirra

Speaker Size:




Compatible Vehicle Make:

For Chevrolet

ESI Products
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 Manufactured in the USA!


  • Model# OB-Q63
  • Fits: GM 1500 Silverado/Sierra Extended Cab  1999-2007 Classic
  • 51 1/8" width x 15 1/8" deep x 9 1/2" tall
  • Speaker Mounting depth 5 3/4"
  • CUT OUT DIAMETER: 11 1/16"
  • Tuned at: 38 HZ
  • 1.50 CU FT AIR
  • Made with U.S.A. High Quality MDF 5/8"
  • Holds 2ea 12" Sub Woofer
  • High Output with Labyrinth Slot Vent Design 

 Works in the years :
With the classic body style.
Not with the new body style.


This high quality USA made box is made only with the finest quality MDF.

The 5/8" MDF is routered on all the corners to give this box a unique look, sides have been recessed also which adds to our style.

The OB-Q63 fits right under the back seat of the  GM 1500 Siverado/Sierra Extended Cab   1999-2007 Classic.

We use the Labyrinth slot vent design to increase the loudness of your speakers.

Along with all the features mentioned above we still have a couple items not mentioned, such as this box comes equiped with wires for quick hook up.

It also comes with poly fill incase the air space is too small for the air space recommened for your woofer. This will help the bass response by about 30%.

Helping you to have just what you want with the space given by your vehicle. 

It is a known fact that in order to create a 50% increase in your sub bass system you would need to double the power.  For example, if you are hitting 135 dB’s with an amp that produces 500 watts of RMS power, in order to hit 138 dB’s (50% louder) you would need 1000 watts of RMS power, while adding an additional 2000 watts to double your dB’s (6 dB’s) to 141.

 However, if you are looking to add bass to your car audio system but don’t have the money to buy a new amp, you might want to consider upgrading your speaker box instead.  Now, you may be asking yourself how a simple subwoofer enclosure is going to achieve the same result that would be produced by doubling your power?  And the short answer is by cutting a port hole in your sealed enclosure.

 With a sealed sub box you are hearing only half of what your subwoofer is producing.  However, when you make access to the back side of your woofer via a port hole, the sound can increase up to double compared to designs where the woofer’s back side is sealed off.

 There is no greater example of this than the “Power Port” Obcon Sub Bass builds into all of their specialty truck boxes.  I own a 2001 Chevy Avalanche and decided on their Avalanche enclosure that holds one 10” sub and the sound coming out of it is amazing!  I don’t know for sure if my bass has doubled but I can definitely hear the difference.  Without adding an ounce of power to my current system the “Power Port” proves to be an easy and effective alternative to upgrading your low end on a limited budget.

 My personal need was for a Chevy Avalanche truck but I know they carry specialty enclosures for Ford, Dodge, Toyota, and other popular Chevy trucks.  I highly recommend the Obcon enclosures and if you are unsure if it will make a difference in your current sub bass set up Obcon will send you a computerized sound graph of your woofer in a sealed speaker box and compare it to what it will sound like in one of their “Power Port” specialty truck boxes.

Give this box a try I am sure you will be pleased.

Please watch this short video.


R&T Enterprises is excited to announce a universal enclosure design that delivers mind blowing ground pounding bass at competition level SPL’s performing with 95% of all subwoofers on the market today. The secret is in our Labyrinth Slot Vent design. The multi-directional slot vent acts as a filter to unwanted standing bass waves. Conversely, you will find in a standard sealed enclosures these standing bass waves will actually cancel out the desired low frequency clean waves. Ironically, most novices erroneously blame the systems poor sound on the sub. Now you know the truth.

No matter what brand you prefer ( MTX, JBL, JL AUDIO, MEMPHIIS AUDIO, KICKER, PIONEER, SONY CAR AUDIO, KENWOOD, ALPINE, ROCKFORD FOSGATE, DIAMOND AUDIO , AND OTHERS ) the R/T Labyrinth Slot Vent sub enclosure will literally come close to doubling your bass output compared to any standard sealed box recommended by the manufacturer of the woofer.

There is a certain thing we would like you to understand.

 After, 27 years in enclosure manufacturing and design, R/T leads the way in sound reproduction for the car audio industry. If your woofer requirements are within 20% over or under the Cu Ft Air Space offered on the box you are looking at you will love the results. NO DOUBT!

There are three major things to consider when matching a woofer to a box.

They are:

Cubic Air Space,

 Cutout Diameter And, Mounting Depth.

Please feel free to contact me through eBay with any questions you may have.




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Item location: Kewanee, Illinois, United States
Shipping to: United States
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If you accept the insurance option, your product will be insured for it's full value through the freight company. This insurance covers theft and mysterious disappearance, BUT NOT DAMAGE INCURRED DURING SHIPMENT. Always examine the product carefully at the time of delivery and have the driver note any damage, no matter how insignificant! This nearly always guaranties payment from the carrier. If damage is discovered later the carrier will send an inspector, BUT YOU MUST HAVE THE BOX AND THE UNUSED PRODUCT ON HAND FOR INSPECTION. R&T will do all the paperwork and file the claim in your behalf. Immediately call 1-800-451-9779 ext 200 and we will guide you through the procedure, and, many times re-ship you a new item while the claim is in process. Returns: 1-800-451-9779 ext 201 Always call for a RETURN AUTHORIZATION (RA). Items returned without an RA will be refused. Unused product that is determined by R&T not to be defective will incur a 20% restocking fee. Custom products, generally, are NOT returnable for less than a 50% restocking fee.

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