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  1. Home
  2. MTX Store
  3. Discontinued MTX Car Audio & Electronics
  4. Discontinued MTX Car Subwoofers
  5. Discontinued MTX Custom-fit Subwoofer Boxes
  6. Discontinued MTX MTX Thunderform Boxes

Discontinued MTX MTX Thunderform Boxes for your 1982 4000 close

Transform your vehicle's sound with MTX Thunderform Boxes, designed for a perfect fit.

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RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
Series
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
Top-Mount Depth (Mounting Depth)
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
Voice Coil(s)
Dual voice coil subs have more wiring flexibility than single voice coils subs; however, single voice coil subwoofers provide easier hookup options for wiring multiple subwoofers in parallel or series. You may also run a dual voice coil (DVC) sub in parallel, series, or combination. A quad voice coil has four voice coils and is equal to two dual voice coil subwoofers as far as wiring goes.
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
Subwoofer Design
This is the design of the subwoofer or the opening of the subwoofer enclosure. Each design has it's own benefits, whether it is a square, circle, or oval.

Round/Circle: This is the typical and common subwoofer design. They have a round cone and are a circle in design.

Square: These woofers are able to achieve a greater cone area in a smaller space. Because of the greater surface area, some square subwoofers will be louder than a round subwoofer of the same size.

Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
  Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
Xmax (millimeters)
Typically measured in millimeters, the Xmax value is the measure of a speaker cone's maximum excursion in one direction while maintaining a linear behavior.
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MTX Audio Thunderform F150R04BK24A-T45 (Black, Amplified)

Ford F-150 Regular Cab 2004-2010, Amplified 2 12" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

F150R04BK24A-T45 big DISCONTINUED
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MTX Audio Thunderform F150R04BK24A-T45 (Black, Amplified)

Ford F-150 Regular Cab 2004-2010, Amplified 2 12" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Dual 12" Amplified Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2004-2008 Ford F-150 Regular Cab
• Loaded with 12" Thunder4500 Subwoofer
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

No Fit Icon Doesn't fit your 4000

• Dual 12" Amplified Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2004-2008 Ford F-150 Regular Cab
• Loaded with 12" Thunder4500 Subwoofer
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

MTX Audio Thunderform C15EX07FB10-T45 (Black, Loaded)

Chevrolet 1500/2500 Extra Cab 2007-2010 Loaded 10" 4 ohm Subwoofer Enclosure

C15EX07FB10-T45 big DISCONTINUED
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MTX Audio Thunderform C15EX07FB10-T45 (Black, Loaded)

Chevrolet 1500/2500 Extra Cab 2007-2010 Loaded 10" 4 ohm Subwoofer Enclosure

• Loaded 10" Subwoofer Enclosure
• Fits in Chevrolet 1500/2500 Extended Cab 2007-2010
• 450W Max
• 225W RMS
• Fiberglass Construction
• 1.5" Voice Coil
• 30oz. Strontium Ferrite Magnet
• Enclosure Volume: 1.0 Cubic Ft

No Fit Icon Doesn't fit your 4000

• Loaded 10" Subwoofer Enclosure
• Fits in Chevrolet 1500/2500 Extended Cab 2007-2010
• 450W Max
• 225W RMS
• Fiberglass Construction
• 1.5" Voice Coil
• 30oz. Strontium Ferrite Magnet
• Enclosure Volume: 1.0 Cubic Ft

MTX Audio Thunderform DRQC20AC-TN (Charcoal, Amplified) Open Box (Complete)

Dodge Ram Quad Cab 2002-2014, Amplified 2 10" 4 ohm Vehicle Specific Thunderform Subwoofer Enclosure

DRQC20AC-TN big DISCONTINUED
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MTX Audio Thunderform DRQC20AC-TN (Charcoal, Amplified) Open Box (Complete)

Dodge Ram Quad Cab 2002-2014, Amplified 2 10" 4 ohm Vehicle Specific Thunderform Subwoofer Enclosure

• Dual 10" Loaded Amplified MTX Thunderform Subwoofer Enclosure
• For Dodge Ram Quad Cab 2002-2014
• Loaded with Dual Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 Ohm

No Fit Icon Doesn't fit your 4000

2

• Dual 10" Loaded Amplified MTX Thunderform Subwoofer Enclosure
• For Dodge Ram Quad Cab 2002-2014
• Loaded with Dual Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 Ohm

MTX Audio Thunderform CTYE01BK10A-T45 (Black, Amplified)

Chevrolet Tahoe 2001-2006, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

CTYE01BK10A-T45 big DISCONTINUED
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MTX Audio Thunderform CTYE01BK10A-T45 (Black, Amplified)

Chevrolet Tahoe 2001-2006, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Sealed MTX Thunderform Amplified Subwoofer Enclosure Loaded with a 10" Thunder4500 Subwoofer• For Chevrolet Tahoe 2001-2006 • 450W Max • 225W RMS • 4 Ohm • Replaces factory console • Black

No Fit Icon Doesn't fit your 4000

1

Sealed MTX Thunderform Amplified Subwoofer Enclosure Loaded with a 10" Thunder4500 Subwoofer• For Chevrolet Tahoe 2001-2006 • 450W Max • 225W RMS • 4 Ohm • Replaces factory console • Black

MTX Audio Thunderform F250C00C10A-T45 (Charcoal, Amplified)

Ford F-250 Crew Cab 2000-2006, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

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MTX Audio Thunderform F250C00C10A-T45 (Charcoal, Amplified)

Ford F-250 Crew Cab 2000-2006, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Amplified 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure • For 2000-2007 Ford F-250 and F-350 Supercrew • Loaded with Thunderform4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon filled polypropylene cone

No Fit Icon Doesn't fit your 4000

1

Amplified 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure • For 2000-2007 Ford F-250 and F-350 Supercrew • Loaded with Thunderform4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon filled polypropylene cone

MTX Audio Thunderform FMC10A-T45 (Gray, Amplified)

Ford Mustang 1994-2004, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

FMC10A-T45 big DISCONTINUED
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MTX Audio Thunderform FMC10A-T45 (Gray, Amplified)

Ford Mustang 1994-2004, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Amplified 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure • For 1994-2004 Ford Mustang • Loaded with Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon Filled Polypropylene Cone

No Fit Icon Doesn't fit your 4000

Amplified 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure • For 1994-2004 Ford Mustang • Loaded with Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon Filled Polypropylene Cone

MTX Audio Thunderform F250X00T20A-TN (Tan, Amplified) Open Box (Complete)

Ford F-250 Super Cab 2000-2007, Amplified 2 10" 4 ohms Loaded Car Specific Thunderform Subwoofer Enclosure

F250X00T20A-TN big DISCONTINUED
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MTX Audio Thunderform F250X00T20A-TN (Tan, Amplified) Open Box (Complete)

Ford F-250 Super Cab 2000-2007, Amplified 2 10" 4 ohms Loaded Car Specific Thunderform Subwoofer Enclosure

• Amplified Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2007 Ford F-250 Super Cab
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 Ohm

No Fit Icon Doesn't fit your 4000

• Amplified Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2007 Ford F-250 Super Cab
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 Ohm

MTX Audio Thunderform F250R00BK20A-TN (Black, Amplified)

Ford F-250 Regular Cab 2000-2006, Amplified 2 10" 4 ohms Vehicle Specific Thunderform Sub Enclosure

F250R00BK20A-TN big DISCONTINUED
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MTX Audio Thunderform F250R00BK20A-TN (Black, Amplified)

Ford F-250 Regular Cab 2000-2006, Amplified 2 10" 4 ohms Vehicle Specific Thunderform Sub Enclosure

• Amplified Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2006 Ford F-250 Regular Cab
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• Amplified Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2006 Ford F-250 Regular Cab
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

MTX Audio Thunderform F150EX09FB10A-TN (Black, Amplified) Open Box

Ford F-150 SuperCab 2009-2010, Amplified & Loaded 10" Subwoofer Enclosure

F150EX09FB10A-TN big DISCONTINUED
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MTX Audio Thunderform F150EX09FB10A-TN (Black, Amplified) Open Box

Ford F-150 SuperCab 2009-2010, Amplified & Loaded 10" Subwoofer Enclosure

Amplified 10" Subwoofer Enclosure • Fits in Ford F-150 SuperCab Cab 2009-2010 • 400W Max • 200W RMS • Fiberglass Construction • Built-in BTL Amplifier • 28oz. Magnet • Enclosure Volume: 1.0 Cubic Ft

No Fit Icon Doesn't fit your 4000

Amplified 10" Subwoofer Enclosure • Fits in Ford F-150 SuperCab Cab 2009-2010 • 400W Max • 200W RMS • Fiberglass Construction • Built-in BTL Amplifier • 28oz. Magnet • Enclosure Volume: 1.0 Cubic Ft

MTX Audio Thunderform JWTJ97T20A-TN (Tan, Amplified)

, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Sub Enclosure

JWTJ97T20A-TN big DISCONTINUED
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MTX Audio Thunderform JWTJ97T20A-TN (Tan, Amplified)

, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Sub Enclosure

• Amplified 2 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure
• 1997-2006 Jeep Wrangler TJ
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• Amplified 2 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure
• 1997-2006 Jeep Wrangler TJ
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

MTX Audio Thunderform JWTJ97C20A-TN (Charcoal, Amplified) Open Box (Complete)

Jeep Wrangler TJ 1997-2006, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Sub Enclosure

JWTJ97C20A-TN big DISCONTINUED
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MTX Audio Thunderform JWTJ97C20A-TN (Charcoal, Amplified) Open Box (Complete)

Jeep Wrangler TJ 1997-2006, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Sub Enclosure

• Amplified 2 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure
• 1997-2006 Jeep Wrangler TJ
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

1

• Amplified 2 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure
• 1997-2006 Jeep Wrangler TJ
• Loaded with Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

MTX Audio Thunderform BUG10A-TN (Black, Amplified)

Volkswagen Beetle 1998-2007, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Sub Enclosure

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MTX Audio Thunderform BUG10A-TN (Black, Amplified)

Volkswagen Beetle 1998-2007, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Sub Enclosure

• Amplified 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• Volkswagen Beetle 1998-2007
• Loaded with a Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• Amplified 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• Volkswagen Beetle 1998-2007
• Loaded with a Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

MTX Audio Thunderform CXP20AC-TN (Charcoal, Amplified)

Chevrolet Extra Cab 1999-2006, Amplified 2 10" 4 ohm Car Specific Thunderform Subwoofer Enclosure

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MTX Audio Thunderform CXP20AC-TN (Charcoal, Amplified)

Chevrolet Extra Cab 1999-2006, Amplified 2 10" 4 ohm Car Specific Thunderform Subwoofer Enclosure

• Dual 10" Loaded Amplified Thunderform Subwoofer Enclosure
• For 1999-2006 Chevrolet Extra Cab
• Also Fits 1999-2001 GMC Pick-Up Extended Cab
• 800W Max
• 400W RMS
• Built-in 200W Amplifier

No Fit Icon Doesn't fit your 4000

• Dual 10" Loaded Amplified Thunderform Subwoofer Enclosure
• For 1999-2006 Chevrolet Extra Cab
• Also Fits 1999-2001 GMC Pick-Up Extended Cab
• 800W Max
• 400W RMS
• Built-in 200W Amplifier

MTX Audio Thunderform FMUST05BK12A-TN (AMPLIFIED) (Open Box, Complete)

Ford Mustang 2005-2009, Amplified 12" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

FMUST05BK12A-TN big DISCONTINUED
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MTX Audio Thunderform FMUST05BK12A-TN (AMPLIFIED) (Open Box, Complete)

Ford Mustang 2005-2009, Amplified 12" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Amplified 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2005-2008 Ford Mustang
• Loaded with Thunder4500 Subwoofer
• 400W Max
• 200W RMS
• 4 ohm
• Polypropylene Cone

No Fit Icon Doesn't fit your 4000

• Amplified 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2005-2008 Ford Mustang
• Loaded with Thunder4500 Subwoofer
• 400W Max
• 200W RMS
• 4 ohm
• Polypropylene Cone

MTX Audio Thunderform C25HC00C20-T45 (Tan, Loaded) Open Box

Chevrolet 2500/3500 Crew Cab 2000-2006, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

C25HC00T20-T45 big DISCONTINUED
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MTX Audio Thunderform C25HC00C20-T45 (Tan, Loaded) Open Box

Chevrolet 2500/3500 Crew Cab 2000-2006, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Dual 10" Loaded Thunderform Subwoofer Enclosure • For Chevrolet 2500/3500 Crew Cab 2000-2006 • 900W Max • 450W RMS • 4 ohm • Also fits 2000-2006 GMC 2500 and 3500HD Crew Cab

No Fit Icon Doesn't fit your 4000

Dual 10" Loaded Thunderform Subwoofer Enclosure • For Chevrolet 2500/3500 Crew Cab 2000-2006 • 900W Max • 450W RMS • 4 ohm • Also fits 2000-2006 GMC 2500 and 3500HD Crew Cab

MTX Audio Thunderform NTTNK04G20A-T45 (Gray, Amplified)

Nissan Titan King Cab 2004-2008, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

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MTX Audio Thunderform NTTNK04G20A-T45 (Gray, Amplified)

Nissan Titan King Cab 2004-2008, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Amplified Dual 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure • For 2004-2008 Nissan Titan King Cab • Loaded with Thunder4500 Subwoofer • 900W Max • 450W RMS • 4 ohm • Carbon Filled Polypropylene Cone

No Fit Icon Doesn't fit your 4000

Amplified Dual 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure • For 2004-2008 Nissan Titan King Cab • Loaded with Thunder4500 Subwoofer • 900W Max • 450W RMS • 4 ohm • Carbon Filled Polypropylene Cone

MTX Audio Thunderform F250X00G20-T45 (Gray, Loaded)

Ford F-250 Super Cab 2000-2007, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

F250X00G20-T45 big DISCONTINUED
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MTX Audio Thunderform F250X00G20-T45 (Gray, Loaded)

Ford F-250 Super Cab 2000-2007, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure • For 2000-2007 Ford F-250 Super Cab • Loaded with Thunder4500 Subwoofers • 900W Max • 450W RMS • 4 ohm • Carbon filled polypropylene cone

No Fit Icon Doesn't fit your 4000

Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure • For 2000-2007 Ford F-250 Super Cab • Loaded with Thunder4500 Subwoofers • 900W Max • 450W RMS • 4 ohm • Carbon filled polypropylene cone

MTX Audio Thunderform C25HC00C20-T45 (Tan, Loaded)

Chevrolet 2500/3500 Crew Cab 2000-2006, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

C25HC00T20-T45 big DISCONTINUED
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MTX Audio Thunderform C25HC00C20-T45 (Tan, Loaded)

Chevrolet 2500/3500 Crew Cab 2000-2006, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Dual 10" Loaded Thunderform Subwoofer Enclosure • For Chevrolet 2500/3500 Crew Cab 2000-2006 • 900W Max • 450W RMS • 4 ohm • Also fits 2000-2006 GMC 2500 and 3500HD Crew Cab

No Fit Icon Doesn't fit your 4000

Dual 10" Loaded Thunderform Subwoofer Enclosure • For Chevrolet 2500/3500 Crew Cab 2000-2006 • 900W Max • 450W RMS • 4 ohm • Also fits 2000-2006 GMC 2500 and 3500HD Crew Cab

MTX Audio Thunderform DRXP20AC-T45 (Charcoal, Amplified)

Dodge Ram Extra Cab 1994-2001, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

DRXP20AC-T45 big DISCONTINUED
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MTX Audio Thunderform DRXP20AC-T45 (Charcoal, Amplified)

Dodge Ram Extra Cab 1994-2001, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Amplified Dual 10" 4 ohm Loaded Thunderform Subwoofer Enclosure • For 1994-2001 Dodge Ram Extra Cab • Thunder4500 Subwoofers Loaded • 900W Max • 450W RMS • Carbon filled polypropylene cone

No Fit Icon Doesn't fit your 4000

1

Amplified Dual 10" 4 ohm Loaded Thunderform Subwoofer Enclosure • For 1994-2001 Dodge Ram Extra Cab • Thunder4500 Subwoofers Loaded • 900W Max • 450W RMS • Carbon filled polypropylene cone

MTX Audio Thunderform NFTRC05T10A-T45 (Tan, Amplified) Open Box

(Open Box) Nissan Frontier Crew Cab 2005-2007, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

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MTX Audio Thunderform NFTRC05T10A-T45 (Tan, Amplified) Open Box

(Open Box) Nissan Frontier Crew Cab 2005-2007, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Amplified 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure • Nissan Frontier Crew Cab 2005-2007 • Loaded with Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon filled polypropylene cone

No Fit Icon Doesn't fit your 4000

Amplified 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure • Nissan Frontier Crew Cab 2005-2007 • Loaded with Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon filled polypropylene cone

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