8" 842 Ultra Subwoofer

Build your next car audio setup around the TrueBass 8" ULTRA Subwoofer/Speaker, model TBS 842DV Ultra. This 8-inch driver features dual 4-ohm voice coils and 275 watts RMS / 600 watts peak power handling for planning a dedicated bass upgrade.

Whether you are refreshing an existing system or starting a custom build, choosing the woofer is only part of the plan. Picture your favorite tracks with a dedicated subwoofer handling the bass, then match the driver to a suitable enclosure, amplifier and wiring configuration. Confirm mounting measurements before ordering rather than relying on nominal driver size alone.

Driver Size:

• Nominal 8" subwoofer/speaker

Series & Model:

• TrueBass ULTRA, TBS 842DV Ultra

Impedance:

• Dual voice coils: 4 ohms per coil (4 / 4 ohms).

Voice-Coil Inside Diameter:

• 2 inches

Woofer & Magnet Weight:

• Total woofer weight: 12 lbs, including the magnets.
• Magnet weight: 160 oz per woofer (2 × 80 oz magnets). This combined magnet weight is included in the total woofer weight, not added on top.

Power Handling (RMS / Peak):

• 275 watts RMS / 600 watts peak
• Use the RMS rating when planning compatible amplification; peak handling is not a continuous-power rating.

Sensitivity:

• 91 dB

Driver Parameters:

• Free-air resonance frequency (Fs): 45 Hz
• Qms: 3.65
• Qes: 0.39
• Qt: 0.35
• Vas: 1.4 cu. ft.
• F3: 50 Hz

Suggested Enclosure:

• Suggested box size: 0.8 cu. ft.
• Ports: two, each measuring 3" × 11".

Application:

• Bass-focused car audio installations
• Plan enclosure and amplifier compatibility for your specific build.

Installation Planning:

• Confirm mounting depth and cutout dimensions rather than relying on nominal driver size alone.
• Match the final wiring impedance to your amplifier's supported load.
• Confirm whether the suggested box volume is net or gross, the port measurement convention, and the intended tuning before building an enclosure.

Before You Order:

• Contact TrueBass Solutions with your vehicle details, available enclosure space and amplifier information.
• Confirm what is included with this listing and request measurement conditions for sensitivity and F3 when comparing designs.
• If replacing an existing woofer, compare both mounting measurements and electrical requirements before installation.