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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 1976 Elite 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 FRANX99T20U (Tan, Unloaded)

Unloaded Dual 10" Custom-Fit Bass Slammer Subwoofer Enclosure for 1999-2007 Ford Ranger Super Cab

FRANX99T20U big DISCONTINUED
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MTX Audio Thunderform FRANX99T20U (Tan, Unloaded)

Unloaded Dual 10" Custom-Fit Bass Slammer Subwoofer Enclosure for 1999-2007 Ford Ranger Super Cab

• Unloaded Dual 10" Custom-Fit Bass Slammer Subwoofer Enclosure
• Vehicle Specific for 1999-2007 Ford Ranger Super Cab
• Installs Under Rear Jump Seats
• Dual 10" Subwoofers
• Box Volume: 0.92 Cubic Feet
• Tan

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• Unloaded Dual 10" Custom-Fit Bass Slammer Subwoofer Enclosure
• Vehicle Specific for 1999-2007 Ford Ranger Super Cab
• Installs Under Rear Jump Seats
• Dual 10" Subwoofers
• Box Volume: 0.92 Cubic Feet
• Tan

MTX Audio Thunderform F250C00BK10-T45 (Black, Loaded)

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

F250C00BK10-T45 big DISCONTINUED
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MTX Audio Thunderform F250C00BK10-T45 (Black, Loaded)

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

10" Loaded MTX Thunderform Sealed Subwoofer Enclosure • For 2000-2007 Ford F-250 Crew Cab • Loaded with 10" Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon filled polypropylene cone

No Fit Icon Doesn't fit your Elite

10" Loaded MTX Thunderform Sealed Subwoofer Enclosure • For 2000-2007 Ford F-250 Crew Cab • Loaded with 10" Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm • Carbon filled polypropylene cone

MTX Audio Thunderform TTP10G-T45 (Gray, Loaded)

Toyota Tacoma Regular Cab 1996-2004, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

TTP10G-T45 big DISCONTINUED
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MTX Audio Thunderform TTP10G-T45 (Gray, Loaded)

Toyota Tacoma Regular Cab 1996-2004, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

Single 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure • For 1996-2004 Toyota Tacoma Regular Cab • Loaded with Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm

No Fit Icon Doesn't fit your Elite

Single 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure • For 1996-2004 Toyota Tacoma Regular Cab • Loaded with Thunder4500 Subwoofer • 450W Max • 225W RMS • 4 ohm

MTX Audio Thunderform TTP10T-T45 (Tan, Loaded)

Toyota Tacoma Regular Cab 1996-2004, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

TTP10T-T45 big DISCONTINUED
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MTX Audio Thunderform TTP10T-T45 (Tan, Loaded)

Toyota Tacoma Regular Cab 1996-2004, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Single 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure
• For 1996-2004 Toyota Tacoma Regular Cab
• Loaded with Thunder4500 Subwoofer
• 450W Max
• 225W RMS
• 4 ohm

No Fit Icon Doesn't fit your Elite

• Single 10" Loaded Vehicle Specific MTX Thunderform Sealed Subwoofer Enclosure
• For 1996-2004 Toyota Tacoma Regular Cab
• Loaded with Thunder4500 Subwoofer
• 450W Max
• 225W RMS
• 4 ohm

MTX Audio Thunderform RMP10T-T45 (Tan, Loaded)

Ford Ranger Regular Cab 1993-1997, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

RMP10T-T45 big DISCONTINUED
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MTX Audio Thunderform RMP10T-T45 (Tan, Loaded)

Ford Ranger Regular Cab 1993-1997, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Single 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1993-1997 Ford Ranger Regular Cab
• Loaded with Thunder4500 Subwoofer
• 450W Max
• 225W RMS
• 4 ohm
• Carbon filled Polypropylene Cone

No Fit Icon Doesn't fit your Elite

• Single 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1993-1997 Ford Ranger Regular Cab
• Loaded with Thunder4500 Subwoofer
• 450W Max
• 225W RMS
• 4 ohm
• Carbon filled Polypropylene Cone

MTX Audio Thunderform NEON10BK-TN (Black, Loaded)

Dodge Neon 1993-1998, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

NEON10BK-TN big DISCONTINUED
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MTX Audio Thunderform NEON10BK-TN (Black, Loaded)

Dodge Neon 1993-1998, 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Loaded 10" Subwoofer Enclosure
• Fits In Dodge Neon 1995-1999
• 400W Max
• 200W RMS
• Enclosure Volume: 0.8 Cubic Ft

No Fit Icon Doesn't fit your Elite

• Loaded 10" Subwoofer Enclosure
• Fits In Dodge Neon 1995-1999
• 400W Max
• 200W RMS
• Enclosure Volume: 0.8 Cubic Ft

MTX Audio Thundeform CF10-TN (Black, Loaded)

Chevrolet Camaro / Pontiac Firebird 1993-2002, 10" 4 ohms Vehicle Specific Subwoofer Enclosure

CF10-TN big DISCONTINUED
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MTX Audio Thundeform CF10-TN (Black, Loaded)

Chevrolet Camaro / Pontiac Firebird 1993-2002, 10" 4 ohms Vehicle Specific Subwoofer Enclosure

• MTX Audio ThunderForm 10" Loaded Vehicle Specific Terminator Series Subwoofer Enclosure
• For 1993-2002 Chevrolet Camaro and Pontiac Firebird
• Virtually Invisible When Installed

No Fit Icon Doesn't fit your Elite

• MTX Audio ThunderForm 10" Loaded Vehicle Specific Terminator Series Subwoofer Enclosure
• For 1993-2002 Chevrolet Camaro and Pontiac Firebird
• Virtually Invisible When Installed

MTX Audio Thunderform RMP10AT-TN (Tan, Amplified)

Ford Ranger Regular Cab 1993-1997, Amplified 10" 4 ohm Loaded Car Specific Thunderform Sub Enclosure

RMP10AT-TN big DISCONTINUED
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MTX Audio Thunderform RMP10AT-TN (Tan, Amplified)

Ford Ranger Regular Cab 1993-1997, Amplified 10" 4 ohm Loaded Car Specific Thunderform Sub Enclosure

• Amplified 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1993-1997 Ford Ranger Regular Cab
• Loaded with a Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

No Fit Icon Doesn't fit your Elite

• Amplified 10" Loaded Vehicle Specific MTX Thunderform Subwoofer Enclosure
• For 1993-1997 Ford Ranger Regular Cab
• Loaded with a Terminator Series Subwoofer
• 400W Max
• 200W RMS
• 4 ohm

MTX Audio Thunderform C25HC00C20-T45 (Charcoal, Loaded)

Dual Loaded 10" Subwoofer Enclosure for 2000-2006 Chevy 2500HD Crew

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

Dual Loaded 10" Subwoofer Enclosure for 2000-2006 Chevy 2500HD Crew

• Location: Behind rear seat, jack stays in factory location. Also fits 2000-2006 Chevy 3500HD Crew Cab
• For Chevy 2000-2006 Expedition vehicles
• 10" Thunder Series Subwoofer
• 225W Max
• 115W RMS
• Carbon filled polypropylene cone
• 4 ohm impedance

No Fit Icon Doesn't fit your Elite

1

• Location: Behind rear seat, jack stays in factory location. Also fits 2000-2006 Chevy 3500HD Crew Cab
• For Chevy 2000-2006 Expedition vehicles
• 10" Thunder Series Subwoofer
• 225W Max
• 115W RMS
• Carbon filled polypropylene cone
• 4 ohm impedance

MTX Audio Thunderform DRQC20T-T45 (Tan, Loaded)

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

DRQC20T-T45 big DISCONTINUED
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MTX Audio Thunderform DRQC20T-T45 (Tan, Loaded)

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

Under rear seat. No loss of leg room. • For 2002-up Dodge Ram Quad Cab • 10" Thunder Series Subwoofer • 225W Max • 115W RMS • Carbon filled polypropylene cone • 4 ohm impedance

No Fit Icon Doesn't fit your Elite

Under rear seat. No loss of leg room. • For 2002-up Dodge Ram Quad Cab • 10" Thunder Series Subwoofer • 225W Max • 115W RMS • Carbon filled polypropylene cone • 4 ohm impedance

MTX Audio Thunderform F150R04C24A-TN (Charcoal, Amplified)

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

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MTX Audio Thunderform F150R04C24A-TN (Charcoal, Amplified)

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

• Dual 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2004-2008 Ford F-150 Regular Cab
• Loaded with 12" Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm
• Polypropylene Cone

No Fit Icon Doesn't fit your Elite

• Dual 12" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For 2004-2008 Ford F-150 Regular Cab
• Loaded with 12" Terminator Series Subwoofers
• 800W Max
• 400W RMS
• 4 ohm
• Polypropylene Cone

MTX Audio Thunderform F250X00BK20A-T45 (Black, Amplified)

Ford F-250 Super Cab 2000-2010, Amplified 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

F250X00BK20A-T45 big DISCONTINUED
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MTX Audio Thunderform F250X00BK20A-T45 (Black, Amplified)

Ford F-250 Super Cab 2000-2010, 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 Elite

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 F250R00T20A-T45 (Tan, Amplified)

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

F250R00T20A-T45 big DISCONTINUED
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MTX Audio Thunderform F250R00T20A-T45 (Tan, Amplified)

Ford F-250 Regular Cab 2000-2006, 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 Elite

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 F250R00G20-T45 (Gray, Loaded)

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

F250R00G20-T45 big DISCONTINUED
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MTX Audio Thunderform F250R00G20-T45 (Gray, 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 Elite

• 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 FRP20B-T45 (Blue, Loaded)

Ford F-150 Regular Cab 1997-2003, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

FRP20B-T45 big DISCONTINUED
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MTX Audio Thunderform FRP20B-T45 (Blue, Loaded)

Ford F-150 Regular Cab 1997-2003, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For Ford F-150 Regular Cab 1997-2003
• Loaded with 10" Thunder4500 Subwoofers
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

No Fit Icon Doesn't fit your Elite

• Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For Ford F-150 Regular Cab 1997-2003
• Loaded with 10" Thunder4500 Subwoofers
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

MTX Audio Thunderform FRP20M-T45 (Maroon, Loaded)

Ford F-150 Regular Cab 1997-2003, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

FRP20M-T45 big DISCONTINUED
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MTX Audio Thunderform FRP20M-T45 (Maroon, Loaded)

Ford F-150 Regular Cab 1997-2003, 2 10" 4 ohms Loaded Vehicle Specific Thunderform Subwoofer Enclosure

• Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For Ford F-150 Regular Cab 1997-2003
• Loaded with 10" Thunder4500 Subwoofers
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

No Fit Icon Doesn't fit your Elite

• Dual 10" Loaded MTX Thunderform Sealed Subwoofer Enclosure
• For Ford F-150 Regular Cab 1997-2003
• Loaded with 10" Thunder4500 Subwoofers
• 900W Max
• 450W RMS
• 4 ohm
• Carbon filled polypropylene cone

MTX Audio Thunderform F250X00C20-T45 (Charcoal, Loaded)

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

F250X00C20-T45 big DISCONTINUED
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MTX Audio Thunderform F250X00C20-T45 (Charcoal, 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 Elite

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 FRANX99G20-T45 (Gray, Loaded)

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

FRANX99G20-T45 big DISCONTINUED
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MTX Audio Thunderform FRANX99G20-T45 (Gray, Loaded)

Ford Ranger Super Cab 1999-2007, 2 10" 4 ohms 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 Thunder4500 Subwoofers
• 900W Max
• 450W RMS
• 4 ohm

No Fit Icon Doesn't fit your Elite

• 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 FRANX99T20-T45 (Tan, Loaded)

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

FRANX99T20-T45 big DISCONTINUED
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MTX Audio Thunderform FRANX99T20-T45 (Tan, Loaded)

Ford Ranger Super Cab 1999-2007, 2 10" 4 ohms 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 Thunder4500 Subwoofers
• 900W Max
• 450W RMS
• 4 ohm

No Fit Icon Doesn't fit your Elite

• 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 JWTJ97C20-T45 (Charcoal, Loaded)

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

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MTX Audio Thunderform JWTJ97C20-T45 (Charcoal, Loaded)

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 Thunder4500 Subwoofer
• 900W Max
• 450W RMS
• 4 ohm
• Carbon Filled Polypropylene Cone

No Fit Icon Doesn't fit your Elite

• Dual 10" Loaded Vehicle Specific Thunderform Subwoofer Enclosure
• 1997-2006 Jeep Wrangler TJ
• Loaded with Thunder4500 Subwoofer
• 900W Max
• 450W RMS
• 4 ohm
• Carbon Filled Polypropylene Cone

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