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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 1987 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 JETTA10-TN (Black, Loaded)

Volkswagen Jetta 1999-2005, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

JETTA10-TN big DISCONTINUED
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MTX Audio Thunderform JETTA10-TN (Black, Loaded)

Volkswagen Jetta 1999-2005, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure
• Volkswagen Jetta 1999-2005
• Loaded with a Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure
• Volkswagen Jetta 1999-2005
• Loaded with a Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

MTX Audio Thunderform DRXP20B-T45 (Blue, Loaded)

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

DRXP20B-T45 big DISCONTINUED
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MTX Audio Thunderform DRXP20B-T45 (Blue, Loaded)

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

• 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

• 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 FRANX99T20-TN (Tan, Loaded)

Ford Ranger Super Cab 1999-2007, 2 10" 4 ohm Loaded Vehicle Specific Thunderform Subwoofer Enclosure

FRANX99T20-TN big DISCONTINUED
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MTX Audio Thunderform FRANX99T20-TN (Tan, Loaded)

Ford Ranger Super Cab 1999-2007, 2 10" 4 ohm Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Dual 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1999-2007 Ford Ranger Super Cab
• Loaded with 2 Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• Dual 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1999-2007 Ford Ranger Super Cab
• Loaded with 2 Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm

MTX Audio Thunderform F250X00C20A-T45 (Charcoal, Amplified)

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

F250X00C20A-T45 big DISCONTINUED
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MTX Audio Thunderform F250X00C20A-T45 (Charcoal, Amplified)

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

Amplified 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

No Fit Icon Doesn't fit your 4000

1

Amplified 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

MTX Audio Thunderform F250X00G20A-T45 (Gray, Amplified)

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

F250X00G20A-T45 big DISCONTINUED
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MTX Audio Thunderform F250X00G20A-T45 (Gray, Amplified)

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

Amplified 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

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 Thunder4500 Subwoofers • 900W Max • 450W RMS • 4 ohm

MTX Audio Thunderform FRANX99G20A-T45 (Gray, Amplified)

Ford Ranger Super Cab 1999-2007, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

FRANX99G20A-T45 big DISCONTINUED
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MTX Audio Thunderform FRANX99G20A-T45 (Gray, Amplified)

Ford Ranger Super Cab 1999-2007, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Amplified Dual 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure • For 1999-2007 Ford Ranger Super Cab • Loaded with 2 Thunder4500 Subwoofers • 900W Max • 450W RMS • 4 ohm

No Fit Icon Doesn't fit your 4000

Amplified Dual 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure • For 1999-2007 Ford Ranger Super Cab • Loaded with 2 Thunder4500 Subwoofers • 900W Max • 450W RMS • 4 ohm

MTX Audio Thunderform FESCP01C12-TN (Charcoal, Loaded)

Ford Escape 2001-2004, Amplified 12" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

FESCP01C12-TN big DISCONTINUED
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MTX Audio Thunderform FESCP01C12-TN (Charcoal, Loaded)

Ford Escape 2001-2004, Amplified 12" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Single 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For Ford Escape 2001-2004
• Loaded With a 12" Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• Single 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For Ford Escape 2001-2004
• Loaded With a 12" Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

MTX Audio Thunderform FRANX99T20A-TN (Tan, Amplified)

Ford Ranger Super Cab 1999-2007, Amplified 2 10" 4 ohms Vehicle Specific Thunderform Sub Enclosure

FRANX99T20A-TN big DISCONTINUED
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MTX Audio Thunderform FRANX99T20A-TN (Tan, Amplified)

Ford Ranger Super Cab 1999-2007, Amplified 2 10" 4 ohms Vehicle Specific Thunderform Sub Enclosure

• Amplified Dual 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1999-2007 Ford Ranger Super Cab
• Loaded with 2 Terminator Series Subwoofers
• 500W Max
• 400W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• Amplified Dual 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1999-2007 Ford Ranger Super Cab
• Loaded with 2 Terminator Series Subwoofers
• 500W Max
• 400W RMS
• 4 ohm

MTX Audio Thunderform F250R00T20-T45 (Tan, Loaded)

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

F250R00T20-T45 big DISCONTINUED
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MTX Audio Thunderform F250R00T20-T45 (Tan, Loaded)

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

• Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For Ford F-250 Regular Cab 2000-2006
• Loaded with Thunder4500 Subwoofer
• 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 Ford F-250 Regular Cab 2000-2006
• Loaded with Thunder4500 Subwoofer
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

MTX Audio Thunderform HA10A-T45 (Granite, Amplified)

Honda Accord 1994-1997, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

HA10A-T45 big DISCONTINUED
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MTX Audio Thunderform HA10A-T45 (Granite, Amplified)

Honda Accord 1994-1997, Amplified 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Amplified 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure • For 1994-1997 Honda Accord • 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 1994-1997 Honda Accord • Loaded with Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon Filled Polypropylene Cone

MTX Audio Thunderform JWTJ97C20-TN (Charcoal, Loaded) Open Box (Complete)

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

JWTJ97C20-TN big DISCONTINUED
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MTX Audio Thunderform JWTJ97C20-TN (Charcoal, Loaded) Open Box (Complete)

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

• Dual 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

• Dual 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 F150R04C24A-T45 (Charcoal, Amplified)

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

F150R04C24A-T45 big DISCONTINUED
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MTX Audio Thunderform F150R04C24A-T45 (Charcoal, 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 CCOLC04C10A-T45 (Charcoal, Amplified)

Chevrolet Colorado Crew Cab 2004-up / GMC Canyon Crew Cab 2004-2007 Amplified 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure

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MTX Audio Thunderform CCOLC04C10A-T45 (Charcoal, Amplified)

Chevrolet Colorado Crew Cab 2004-up / GMC Canyon Crew Cab 2004-2007 Amplified 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure

10" Thunderform with 200W RMS Built-in Class D Amplifier • Fits in front of cup holder, under rear seat • For 2004-up Chevy Colorado Crew Cab or GMC Canyon • 10" Thunder Series Subwoofer • Class D Amp • 450W Max • 225W RMS • Carbon filled polypropylene cone • 4 ohm impedance

No Fit Icon Doesn't fit your 4000

2

10" Thunderform with 200W RMS Built-in Class D Amplifier • Fits in front of cup holder, under rear seat • For 2004-up Chevy Colorado Crew Cab or GMC Canyon • 10" Thunder Series Subwoofer • Class D Amp • 450W Max • 225W RMS • Carbon filled polypropylene cone • 4 ohm impedance

MTX Audio Thunderform DRXP20AB-T45 (Blue, Amplified)

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

DRXP20AB-T45 big DISCONTINUED
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MTX Audio Thunderform DRXP20AB-T45 (Blue, 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

• 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 F250R00G20A-T45 (Gray, Amplified)

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

F250R00G20A-T45 big DISCONTINUED
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MTX Audio Thunderform F250R00G20A-T45 (Gray, Amplified)

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

• Amplified Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2006 Ford F-250 Regular 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 MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2006 Ford F-250 Regular Cab
• Loaded with Thunder4500 Subwoofer
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

MTX Audio Thunderform FZX3500BK12A-TN (Black, Amplified)

Ford Focus ZX5 / ZX3 2000-2007, Amplified 12" 4 ohm Loaded Car Specific Thunderform Sub Enclosure

FZX3500BK12A-TN big DISCONTINUED
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MTX Audio Thunderform FZX3500BK12A-TN (Black, Amplified)

Ford Focus ZX5 / ZX3 2000-2007, Amplified 12" 4 ohm Loaded Car Specific Thunderform Sub Enclosure

• Amplified Single 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2007 Ford Focus ZX5/ZX3
• Loaded with 12" Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm
• Polypropylene Cone

No Fit Icon Doesn't fit your 4000

• Amplified Single 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2007 Ford Focus ZX5/ZX3
• Loaded with 12" Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm
• Polypropylene Cone

MTX Audio Thunderform FZX3500T12A-TN (Tan, Amplified)

Ford Focus ZX5 / ZX3 2000-2007, Amplified 12" 4 ohm Loaded Car Specific Thunderform Sub Enclosure

FZX3500T12A-TN big DISCONTINUED
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MTX Audio Thunderform FZX3500T12A-TN (Tan, Amplified)

Ford Focus ZX5 / ZX3 2000-2007, Amplified 12" 4 ohm Loaded Car Specific Thunderform Sub Enclosure

• Amplified Single 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2007 Ford Focus ZX5 / ZX3
• Loaded with 12" Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm
• Polypropylene Cone

No Fit Icon Doesn't fit your 4000

• Amplified Single 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2000-2007 Ford Focus ZX5 / ZX3
• Loaded with 12" Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm
• Polypropylene Cone

MTX Audio Thunderform DRQC20T-TN (Tan, Loaded)

Dual Loaded 10" Subwoofer Enclosure for 2002-Up Dodge Ram Quad Cab

DRQC20T-TN big DISCONTINUED
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MTX Audio Thunderform DRQC20T-TN (Tan, Loaded)

Dual Loaded 10" Subwoofer Enclosure for 2002-Up Dodge Ram Quad Cab

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

No Fit Icon Doesn't fit your 4000

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

MTX Audio Thunderform F150R04G24A-T45 (Gray, Amplified)

Ford F-150 Regular Cab 2004-2006 Amplified Dual 12" Loaded Vehicle Specific ThunderForm Subwoofer Enclosure

F150R04G24A-T45-DUPE big DISCONTINUED
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MTX Audio Thunderform F150R04G24A-T45 (Gray, Amplified)

Ford F-150 Regular Cab 2004-2006 Amplified Dual 12" Loaded Vehicle Specific ThunderForm Subwoofer Enclosure

Amplified and Loaded Dual 12" ThunderForm Subwoofer Enclosure for 2004-2006 F-150 Regular Cab (GREY) • 225W Max • 120W RMS • Injection-molded, carbon-filled polypropylene cone woofer • Rubber surround

No Fit Icon Doesn't fit your 4000

Amplified and Loaded Dual 12" ThunderForm Subwoofer Enclosure for 2004-2006 F-150 Regular Cab (GREY) • 225W Max • 120W RMS • Injection-molded, carbon-filled polypropylene cone woofer • Rubber surround

MTX Audio Thunderform FSC10AT-TN (Tan, Amplified)

Ford F-150 Supercrew 2001-2003, Amplified 10" 4 ohms Loaded Car Specific Thunderform Sub Enclosure

FSC10AT-TN big DISCONTINUED
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MTX Audio Thunderform FSC10AT-TN (Tan, Amplified)

Ford F-150 Supercrew 2001-2003, Amplified 10" 4 ohms Loaded Car Specific Thunderform Sub Enclosure

• Amplified 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure
• For 2001-2003 Ford F-150 Supercrew
• Loaded with Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

No Fit Icon Doesn't fit your 4000

• Amplified 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure
• For 2001-2003 Ford F-150 Supercrew
• Loaded with Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

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