Team GP Undertaker v2 18" Subwoofer UT18V2 5,000 RMS

Product Overview

The Team GP Undertaker V2 18-inch subwoofer is rated by GP Car Audio at 5,000 watts RMS and offered in dual 1-ohm and dual 2-ohm voice-coil configurations. Designed for high-output car audio systems, it combines a large motor assembly with a 4-inch, eight-layer voice coil. The 18-inch model needs serious enclosure space: GP recommends a 5.5–7.0-cubic-foot ported design. Measure the full cabinet, port and installation route before committing to a large-format bass build.

This listing is for the subwoofer, not a loaded enclosure or amplifier package. Choose the coil configuration for your complete system before ordering.

Key Features & Benefits

• Manufacturer-rated 5,000W RMS power handling for a properly designed high-output system.
• Dual 1-ohm or dual 2-ohm coils allow different wiring arrangements; select the version that suits the amplifier and number of subwoofers.
• 4-inch, eight-layer round-wire voice coil with a published 100mm winding height, approximately 3.93 inches.
• Aluminum heat-extraction structure from the pole to the back plate, with pole and gap venting.
• Custom triple-stack 270mm magnets, a fully bolted motor and interlocked shorting ring.
• Full magnet-ID shorting ring; the pole cap also serves as a second shorting ring.
• Threaded back plate permits a motor-support attachment within an appropriately engineered enclosure.
• GP states that Undertaker V2 subwoofers are assembled at Sundown Audio in North Carolina.

Technical Specifications

• Brand / series: Team GP Car Audio Undertaker V2.
• Nominal driver size: 18 inches.
• Rated power handling: 5,000 watts RMS.
• Available coil configurations: dual 1 ohm or dual 2 ohms.
• Voice coil: 4-inch diameter, eight layers; 100mm winding height.
• Published motor weight: 93 lb. This is motor weight, not shipping weight.
• Magnet assembly: triple-stack 270mm diameter, approximately 10.63 inches.
• Mounting cutout: 16.68 inches.
• Outside diameter: 18.46 inches.
• Mounting depth: 14.95 inches.
• Driver displacement: 0.30 cubic foot.
• GP suggested ported enclosure volume: 5.5–7.0 cubic feet.
• GP suggested port area: 16–18 square inches per cubic foot.
• GP suggested enclosure tuning: 25–32 Hz.

GP's model-specific parameter sheet is retained below for enclosure design reference. Match the sheet to the selected coil version before using electrical or Thiele/Small parameters.

Why Choose This Product?

Choose the Undertaker V2 18 when your build can support its physical dimensions, enclosure requirements and intended power level. The useful comparison is not wattage alone: check usable cabinet volume, port layout, mounting clearance and amplifier compatibility together. GP describes the Undertaker V2 as a collaboration with Jacob Fuller of Sundown Audio; the cooling and motor construction are central features of this design.

The RMS rating is a manufacturer specification, not a guarantee of vehicle output, a competition score or immunity from damage. Results depend on the enclosure, installation and system settings.

Installation & Compatibility Notes

Allow at least the published 14.95-inch mounting depth, then confirm additional clearance needed for ventilation, wiring and internal bracing. The 16.68-inch cutout and 18.46-inch outside diameter must both suit the baffle. A generic box labeled “18-inch” is not sufficient evidence of fit.

Use GP's 5.5–7.0-cubic-foot ported recommendation and 25–32 Hz tuning range as design inputs, not as a complete cut sheet. Account for the driver's 0.30-cubic-foot displacement, port and bracing when calculating the finished cabinet. GP's product text does not explicitly label its recommended volume as gross or net, so confirm that basis with the enclosure designer before cutting material. No sealed-box recommendation is supplied here.

Have the installer confirm the finished coil wiring and amplifier's permitted load. Dual 1-ohm and dual 2-ohm are coil ratings, not a single fixed final load for every installation. Plan secure mounting, electrical supply, cable sizing, protection and amplifier settings around the complete system. Do not treat the 5,000W rating as an instruction to apply that power in every enclosure.

Frequently Asked Questions

Does the Undertaker V2 18 include an enclosure?

No. This is a standalone subwoofer listing. The enclosure and amplifier are separate parts of the system.

Which voice-coil option should I choose?

Choose dual 1 ohm or dual 2 ohms based on the amplifier's supported impedance and your planned number of drivers. Confirm the complete wiring plan before selecting the variant; the two versions are not interchangeable in every system.

What box does GP recommend?

GP lists a ported enclosure of 5.5–7.0 cubic feet, 16–18 square inches of port area per cubic foot and 25–32 Hz tuning for this 18-inch model. Confirm the volume basis and detailed design before construction.

Will it fit any 18-inch subwoofer box?

No. Check the 16.68-inch cutout, 18.46-inch overall diameter, 14.95-inch mounting depth, cabinet volume and structural support. Nominal diameter alone does not establish compatibility.

Is an expansion heat sink included?

The supplier describes a threaded back plate intended for additional cooling hardware or motor support, but its description identifies the expansion heat sink as a development item. Do not assume that accessory is included or available with this subwoofer.

Explore More

Compare 18-inch car subwoofers, explore car subwoofers, or browse GP Car Audio products. Need help checking the planned enclosure or amplifier match? Contact 12 Volt Outlet before ordering.