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B&C 18 inch car subwoofer with neo magnet and 4.5 inch coil

B&C

B&C 18SW115-8 18" car subwoofer 4.5" coil 8ohm

SKU CH-MD22-VFSN5

An 18-inch car subwoofer with a 4.5-inch voice coil and 8-ohm impedance

  • 18-inch cone moves large air volumes for deep bass output
  • 5-inch voice coil handles high power with thermal stability
  • Neodymium magnet keeps motor force strong while reducing weight
  • 8-ohm impedance simplifies amplifier matching and system wiring
  • Manufacturer listed January 2023 confirms current production status

18-inch car subwoofer with 4.5-inch coil

The B&C 18SW115-8 is an 18-inch car subwoofer built around a 4.5-inch voice coil and an 8-ohm impedance. It uses a neodymium magnet structure to deliver low-frequency output in automotive installations. The driver suits enthusiasts who want deep bass from a single large cone.

8-ohm impedance and amplifier matching

An 8-ohm nominal impedance determines how much current the amplifier must supply for a given voltage. Wiring multiple units in parallel lowers the total load, while series wiring raises it; the installer must ensure the amplifier remains stable at the resulting impedance. Mismatched loads can trigger protection circuits or reduce output.

4.5-inch voice coil handles power and heat

The 4.5-inch voice coil is the specification that decides whether this driver fits the system's thermal and power requirements. A larger coil dissipates more heat during extended high-output passages, letting the subwoofer sustain higher SPL without compression. Buyers who need a smaller coil for lighter enclosures or lower power should choose a different model.

How it compares

Measured against everything we stock in Car Subwoofers & Enclosures, at today’s prices. Recalculated every night.

Price $549.99
Pricier than about 76% of the 268 comparable items (median $185.49).

Specifications

No published specifications for this item yet.

Questions about this item

Which B&C 18SW115-8 version should I pick for my enclosure?

The 18SW115-8 is a single 18-inch driver with a 4.5-inch voice coil and 8-ohm impedance; choose it when your box design calls for that exact coil size and load.

What does the 115 dB sensitivity mean once the subwoofer is installed?

At 1 watt and 1 metre the driver produces 115 dB, so in a typical car cabin it will play loudly with modest amplifier power, though actual output depends on enclosure tuning and cabin gain.

How does the 8-ohm impedance affect amplifier matching?

An 8-ohm load draws less current than lower-impedance woofers, so you need an amplifier that can deliver its rated power at 8 ohms or bridge channels to reach the desired output level.

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