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  1. Home
  2. MB Quart Store
  3. MB Quart Car Audio & Electronics
  4. MB Quart Car Subwoofers
  5. MB Quart Custom-fit Subwoofer Boxes
  6. MB Quart All Custom-fit Subwoofer Boxes

All MB Quart Custom-fit Subwoofer Boxes for your 1990 B Series close

Find the ideal match for your vehicle with MB Quart's All Custom-fit Subwoofer Boxes.

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Vehicle-specific sub box with amp,
Subwoofer Size
Refers to the diameter of the subwoofer, measured in inches.
Number of Subwoofers
This value represents the number of subwoofers that the enclosure accommodates or that are included in the package or bundled kit.
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.

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MB Quart MBQJL-302

400W RMS Loaded Single 12" Vented Enclosure with Monoblock Amplifier for select 2018-2024 Wrangler (JL)

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MB Quart MBQJL-302

400W RMS Loaded Single 12" Vented Enclosure with Monoblock Amplifier for select 2018-2024 Wrangler (JL)

• 12" Amplified Loaded Subwoofer System
• 400 watts RMS
• Includes one MB Quart NA2-400.1 amplifier
• Variable bass boost
• Speaker-level inputs
• Wired remote bass level control

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No Fit Icon Doesn't fit your B Series

List price $829.99
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-18% $679.15

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    1991 Buick Century

    2019 Ram Promaster 2500

    2024 Ford Expedition Max

    2002 Buick Rendezvous

    1990 Mazda B Series

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    2004 Suzuki Aerio

    1996 BMW 750iL

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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
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