SoundQubed HDX3.2 8-Inch Subwoofer – 1,500W RMS Dual Voice Coil

SoundQubed HDX3.2 8-Inch Subwoofer: 1,500W RMS in an 8-Inch Format

Planning a custom car audio bass system starts with choosing a subwoofer that fits both your enclosure and your amplifier. The SoundQubed HDX3.2 8-inch dual voice coil subwoofer combines an 8-inch woofer with a manufacturer-rated 1,500 watts RMS and 3,000 watts peak power handling. It is available in dual 1-ohm and dual 2-ohm configurations, giving you two options when planning your amplifier load.

Picture your next build: the enclosure measured, the amplifier selected, and every connection planned before installation begins. The HDX3.2's published mounting dimensions, enclosure recommendations and Thiele-Small parameters let you work through those details rather than choose an 8-inch car subwoofer by diameter alone. Whether you are replacing an existing woofer or designing a new bass enclosure, check the full fit and electrical requirements before ordering.

Key Features of the HDX3.2 8-Inch Car Audio Subwoofer

• 1,500W RMS power handling: Use the continuous rating as a starting point for system planning rather than treating the 3,000W peak figure as continuous power.
• Dual voice coil choices: Select HDX3.2-8D1 for dual 1-ohm coils or HDX3.2-8D2 for dual 2-ohm coils.
• 2-inch voice coil: Both versions feature a 47 mm coil length.
• 180-ounce magnet: The manufacturer's specified magnet weight is shared by both 8-inch models.
• 13.5 mm Xmax: Both versions have a published ±13.5 mm excursion specification.
• Sealed and ported enclosure recommendations: Choose an enclosure approach using the manufacturer's volume ranges and the parameters for your selected model.

Choose Your Dual Voice Coil Configuration

The HDX3.2-8D1 dual 1-ohm subwoofer and HDX3.2-8D2 dual 2-ohm subwoofer share the same size, power ratings and mounting dimensions, but their electrical and Thiele-Small specifications differ. Select the coil configuration based on your complete wiring plan, including the number of subwoofers and the amplifier's supported impedance. The impedance of each voice coil is not automatically the final load your amplifier will see.

Sealed and Ported Subwoofer Enclosure Planning

SoundQubed lists a 0.35–0.75 ft³ sealed enclosure or a 0.75–1.25 ft³ ported enclosure for the HDX3.2 8-inch models. These ranges provide a starting point for your box design, not a complete enclosure blueprint. The supplied sheet does not specify a port tuning frequency or port dimensions, so those details should be determined as part of the enclosure design rather than guessed.

Check mounting depth, cutout size and motor clearance as well as box volume. An 8-inch speaker opening alone does not establish that an enclosure will fit this subwoofer.

Electroacoustic Specifications and Thiele-Small Parameters

Manufacturer specifications for the SoundQubed HDX3.2-8D1 and HDX3.2-8D2:

Mounting Dimensions

Both coil configurations share these dimensions. Letter references correspond to the manufacturer's mounting diagram.

• A – Overall diameter: 218 mm / 8.58 inches
• B – Mounting cutout diameter: 185 mm / 7.28 inches
• C – Motor diameter: 175 mm / 6.89 inches
• D – Mounting depth: 172 mm / 6.77 inches

SoundQubed HDX3.2 8-Inch Subwoofer FAQs

How much power does the SoundQubed HDX3.2 8-inch subwoofer handle?

Both the HDX3.2-8D1 and HDX3.2-8D2 are rated at 1,500 watts RMS and 3,000 watts peak. The RMS figure is the relevant continuous power-handling specification; the peak figure should not be treated as a continuous amplifier power target.

What is the difference between the dual 1-ohm and dual 2-ohm versions?

The dual 1-ohm version has two 1-ohm voice coils, while the dual 2-ohm version has two 2-ohm voice coils. They share the same power ratings and physical dimensions, but several electrical and Thiele-Small parameters differ, as shown in the table. Choose based on your intended wiring arrangement and amplifier compatibility.

What size sealed box does this 8-inch subwoofer need?

The manufacturer's recommended sealed enclosure volume is 0.35–0.75 cubic feet for either 8-inch coil configuration. Confirm the complete enclosure design and physical fit before installation.

Can I use the HDX3.2 8-inch subwoofer in a ported box?

Yes. SoundQubed lists a recommended ported enclosure volume of 0.75–1.25 cubic feet for both models. Port dimensions and tuning frequency are not provided on the supplied specification sheet and need to be determined separately.

What are the mounting depth and cutout size?

The published mounting depth is 6.77 inches (172 mm), and the mounting cutout diameter is 7.28 inches (185 mm). Overall diameter is 8.58 inches (218 mm), and motor diameter is 6.89 inches (175 mm). Check all four measurements when evaluating enclosure fit.

Is this a shallow-mount subwoofer?

Do not assume shallow-mount compatibility based on the 8-inch size. This model requires 6.77 inches of mounting depth, so measure the available space in your enclosure before choosing it for a truck, under-seat or other space-limited installation.

How do I choose an amplifier for this dual voice coil subwoofer?

Start with the subwoofer's 1,500W RMS rating and your intended final wired impedance. Verify the amplifier's RMS output at that load and its supported minimum impedance. Your selected voice coil option, wiring arrangement and total number of subwoofers must be considered together.

Build your system with the right specifications from the start. Choose your SoundQubed HDX3.2 8-inch dual voice coil subwoofer configuration at 12 Volt Audio, then plan the enclosure and amplifier pairing around the model you select.