It is important to have the best extended cab sub box. Let’s take you step by step, type by type, and find the best extended cab sub box for you.

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Our Top Picks:

Best Overall: Buy: American Sound Connection Great Box READ REVIEW

Best For Easy Install: Buy: Q Power Extended Cab Sub Box READ REVIEW

Best With Nice Finish: Buy: Rockville Extended Cab Sub Box READ REVIEW

Best For Sealed Box: Buy: American Sound Connection Extended Cab Sub Box READ REVIEW

Best For Deepest Bass: Buy: Q Power Great Box READ REVIEW

Best For Good Fit: Buy: Atrend Extended Cab Sub Box READ REVIEW

Best Overall: American Sound Connection Great Box

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The American sound connection great box's material feels more premium than its price would suggest. The American sound connection box is compatible with a wide range of sub brands and models, but entry - level and flat piston subwoofers tend to work best. All the custom series enclosures are made to fit precisely into your 07. This dual 12 " enclosure is designed to fit under the rear bench seat and is a down - firing model.

The box sounds good, it is worth the money and has a sturdy design. Above all, the American sound connection box sounds great too, it allows for great fit and has a great design.

Most buyers opine that the box is 12", much better than 10. And, a few also found that the box would rattle like a tin can. Further, they strongly agree that the box does n't fit correctly close but it teeters on the trans hump in the middle of the truck. With no doubts, this box passed the test and had very satisfied buyers eager to share their experience.

• These fit without any issues and fit crew cabs wrong.
• This is designed for heavy duty and it fits perfectly.
• This protects them and really thumps the truck.
• This will fit your crew cab truck.

Best For Easy Install: Q Power Extended Cab Sub Box

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The Q Power Extended Cab Sub Box has killer features for the price point. The q power extended cab sub box is made for quick delivery and it is worth the price. Turn your ride into a sound machine with the help of the q-power 12" subwoofer enclosure. And, it fits very well and it looks great.

Lastly, the q power extended cab sub box is perfectly good and it is great for a great price.

Most customers quickly discovered that the box fits perfectly under the seat and sounds great and easy to install. And, a few strongly agree that the box is already covered and the color matched. Also, a few also found that the depth from the outside rim of the box to the bottom is 7 1/8 inches. I hope this helps. Overall, at the price, they believe that they got a steal of a deal with it.

• Brand new **q-power 12"** custom gmc/chevy ext cab '99-06 subwoofer box.
• Designed and built for the deepest bass.
• This is great with two jls and a 500/1.
• This allows for a perfect fit and it fits perfectly.

Best With Nice Finish: Rockville Extended Cab Sub Box

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The Rockville extended cabsub box is specially designed for your daily use and has all the useful features. The Rockville extended cab sub box works well and it can be trusted for good quality equipment. This will keep your box performing at an optimal level by not flexing and distorting your woofers. The rec10 dual sealed speaker box is made in the USA with grade “ a ” 5/8 ” mdf wood.

The box is designed with dimensions in inches, is suitable for heavy duty and it allows for very good quality material. In addition, this hits hard, is made worth the price and it buy again. Above all, the Rockville extendedcab subbox sounds very loud and it is great for solid build.

Most buyers find that the box makes a pretty big difference. Also, they say that the box is made with very good equipment. And, they strongly agree that the box fits neatly under the seat and provides accurate tight bass depending on if the. Overall, many have used the box for more than a few months without any complaints, and it shows no sign of giving up.

• This box is for Chevy or gmc 1500 model.
• This fits a 99 chevy silverado so check out the hump.
• This is not only glued at all joints but stapled as well.
• This has a mounting diameter and it fits perfectly.

Best For Sealed Box: American Sound Connection Extended Cab Sub Box

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We would, of course, be remiss if we didn't mention American sound connection extended cab sub box for daily usage. The American sound connection extended cabsub boxes are then liquid nailed, nailed and completely sealed. The Manufacturer says: We offer pre-built enclosures that are ready to be dropped into your 2009. Also, it sounds good and it sounds amazing.

The box is made for tight fit, allows for great fit and it allows for good sound. Most importantly, the American sound connection extendedcab subbox is made with great construction and it looks great.

Almost all buyers find that the box is used to sit in though. In addition, a few say that the box will work but not the right box for that truck. Also, a few strongly agree that the cubic feet of the box is very small and does n't support many subs.

• All the custom series enclosures are made to fit precisely into your 2009.
• This is around .8 per side.
• This is a dual 10" down firing model, Why down firing.
• This fits very well and it fits perfectly.

Best For Deepest Bass: Q Power Great Box

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The Q Power Great Box is capable of outshining several other boxes featured in this list in overall features for the price point. The q power great box is brand new and it is designed for a great price. If you want the most output for your money, this is the way to go. In addition, it is built for the deepest bass.

The box is designed to excellent quality and it is black. Finally, the q power great box is designed to fit underneath the rear seats and boasts .90 cubic feet of air space.

Most customers opine that the box does look like one and make them for all years of trucks. And, a few also found that the box makes all the difference in the world. And, a few strongly agree that the box fits in a 2015 sierra crew cab real well. Therefore, customers were eager to recommend it to friends and families.

• Designed and built for the deepest bass.
• Black bed "rhino" liner spray finish.
• This will reverberate in the middle at high levels.
• "Q bomb" is etched on the top of the box.

Best For Good Fit: Atrend Extended Cab Sub Box

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The Atrend Extended Cab Sub Box should be able to handle its purpose and duties with ease. The atrend extended cab sub box sounds even better, is made with fast shipping and it sounds great. . In addition, the box fits snug, is made for great sound and it is made for easy install.

The box comes with a nice finish and it fits perfectly. In addition, it was designed and engineered specifically for 1997. Above all, the atrend extended cab sub box is a perfect fit, It works great and has a great design.

Most buyers opine that the box is a little less than that for a good fit. And, a few strongly agree that the box is designed to fit under the folded down bench seat of an extended cab. In addition, they say that the box fits on the passenger side of the bench seat. Obviously, this box passed the test and had very satisfied buyers eager to share their experience.

• This is easy to install with no hitches.
• This allows use of the backseat again.
• This is perfect with no modifications needed.
• This does fit sticks out too far in front of the seat.