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Authorized dealer · Car Audio Bargain
Eighteens are built for maximum cone area and the kind of low-frequency pressure you feel in your chest. Our 18 inch subwoofers come from Sundown Audio, Sparked Innovations and Crossfire Car Audio, covering the Sundown Z-Series ZV6, X-Series v.3 and SA-Series v.2, the Crossfire C7-V3, XT3 and XT4, and the Sparked SQL-2000 and Bass Blaster SQL. Low-impedance D1 versions are available in several lines.
An 18 needs a lot of enclosure volume, especially ported, so it suits SUVs, vans, wagons and trucks with dedicated cargo space, or in a wall build that seals off the cabin. Measure carefully and plan airspace before buying. In return, few setups produce as much low-frequency output for the same number of drivers.
Big 18 inch subwoofers demand big amplifiers, and big amplifiers demand current. Plan the electrical system alongside the subs: a high output alternator, additional batteries, and 1/0 AWG power wire for long runs at high current. Wire the coils so the final load matches your amp's stable impedance; two D2 18s with coils in parallel and then paralleled together drop to 0.5 ohm, which only some amps can handle. Follow each manufacturer's box recommendation and use thick, well-braced walls, since enclosure flex wastes output.
Not sure you have the space? Compare 15 inch subwoofers, or check refurbished Sundown Audio drivers, which carry a 90-day warranty. Every size is available from the main subwoofers page.
Shop Pay InstallmentsPay over time, powered by Affirm
Lease-to-own with SnapNo credit needed¹
Pay later with SezzleFlexible payment options
Shop Pay Installments: Rates from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. Snap: The advertised service is a lease-to-own agreement provided by Snap RTO LLC. Lease-to-own financing is not available to residents of Minnesota, New Jersey, and Wisconsin. ¹ Not all applicants are approved. While no credit history is required, Snap obtains information from consumer reporting agencies in connection with submitted applications, and your score with those agencies may be affected. Sezzle: Issued by WebBank or Sezzle. See loan agreement for details. Refurbished items are not eligible for financing or leasing.
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