Skip Navigation

MTX ThunderForms

Custom-fit subwoofer for 2007-up Chevy Silverado Crew Cab

Item #: 23615BTN

In Stock

1 Review | 1 question - 1 answer

Your price: $449.99 Earn up to 450 Rewards points

Add to Cart

+ Add to wishlist + Email me alerts for this product

Ships Free From Manufacturer

View all associated offers

Does it fit my car?

Select your car

Find what fits your car

Can't find your exact car?

Crinkled french fries, discarded receipts, old gum wrappers — you probably have everything in the hidden corners of your vehicle except great bass. ThunderForm enclosures fill the nooks and crannies of your vehicle with low tones that stand out, but their factory look blends right in.

MTX engineers evaluate the "sonic signatures" of top-selling vehicles so they can design ThunderForms as custom acoustic matches. Each ThunderForm fits and blends inconspicuously into your vehicle, so you get great bass without losing any space. They're made of high-density polyethylene resin to curb resonances — they deliver bass that's tight, hard-hitting, and way down low. The airtight enclosure provides the correct internal volume to yield optimum bass response.

This ThunderForm fits under the rear seat of your 2007-up Chevy Silverado Crew Cab pickup. The enclosure houses a rugged Terminator subwoofer — its strong, light cone and special suspension design ensure high output and low distortion.

Product Highlights:

  • custom fit subwoofer
  • black high-density polyethylene resin enclosure
  • mounts under the rear seat
  • single 10" Terminator 4-ohm subwoofer
  • power range: 50-225 watts RMS (450 watts peak power)
  • dimensions: 8"H x 22"W x 18-4/9"D
  • warranty: 5 years (free repair or replacement for 2 years, prorated replacement for years 3 through 5)
  • Our 60-day money-back guarantee

Vehicle-specific enclosures with subs? Say what?

Instead of the usual sub in a box, the manufacturer creates a molded enclosure that fits perfectly into a convenient spot in your specific vehicle, housing a high-quality sub. Some enclosures even include a built-in amp, for the ultimate in stealth bass. The advantages? You don't lose much space (if any), your sub is perfectly matched to its enclosure, and your enclosure has a factory look that won't tell potential thieves you have an awesome sound system. Doesn't get better than that.

MTX ThunderForms Reviews

Average Customer Review:

1 Review

Now I know why they call it Thunderform!

Written by: Steve from Houston, TX on April 4, 2012

Crutchfield Customer Review (What's this?)

I put this custom formed sub in my 2008 Silverado Crew Cab. It fits perfectly under the back seat, drivers side. I'm powering it with a JBL - GTO 5EZ amp. This thing hits so hard, it feels like someone is kicking my seat! It's got great tight base that will loosen the fillings in your teeth! Just about as easy as possible to install and a very clean, sanitary look in the truck.

Pros: Custom fit, kicks like a mule and great sound

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • Black ThunderForm enclosure loaded with one 10" Terminator subwoofer
  • 2 Mounting brackets
  • Four 2" Mounting screws
  • Four 1" Mounting screws
  • Installation manual

Product Research



Vehicle Compatibility: This MTX ThunderForm custom-fit, loaded enclosure is specifically designed to fit select Chevrolet Crew Cab pickups.

Note: Please refer to the Crutchfield Vehicle Selector to confirm fit for your vehicle.

Mounting Location: The ThunderForm enclosure mounts under the rear seat on the Driver's side (install hardware supplied).

Molded Enclosure: The molded, high-density polyethylene resin enclosure resists flexing and dampens resonance.

10" Terminator Subwoofer: This enclosure comes loaded with a single 10" MTX Terminator woofer.


5 Year Warranty Terms: This product carries a 5-Year Prorated Warranty with the following terms:

  • Years 1-2: Products found to be defective in materials or workmanship during the first two years will be, at Mitek's option, repaired or replaced by Mitek at no charge. The warranty period does not renew, but continues on from the original date of purchase.
  • Years 3-5: The purchase price of an item which becomes defective after the first two years and prior to the end of the warranty period will be prorated and credited toward the purchase of a new MTX product. The amount of proration is determined by dividing the original purchase price by the number of months in the warranty period (60), then multiplying the result by the number of months remaining in the warranty period.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

1 question already asked

I forwarded your question to an Advisor and they responded with the following: The MTX Thunderform is designed to mount under the rear seat of the 2007-up Chevy Silverado Crew cab pickups. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Krissy  Jul 02, 2015 ]  Staff

Searches related to the MTX ThunderForms Custom-fit subwoofer for 2007-up Chevy Silverado Crew Cab