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HK Audio LINEAR SUB 4000 2400 Watt 18" Passive Subwoofer

Marsoni M251S
Sale price$1299.50
Pay 4 payments of $324.88 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
HK Audio LINEAR SUB 4000 2400 Watt 18" Passive SubwooferOverview The HK Audio LINEAR SUB 4000 is a powerful 18" dual vented bandpass subwoofer designed to deliver an impressively deep low frequency response, ranging from 30 to 100 Hertz. Compatible with all LINEAR 5 full range speakers and mid high units, it serves as an excellent extension to the LINEAR 5 LTS long throw system. Its robust construction and high power handling capabilities make it ideal for professional sound reinforcement applications.
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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4.1 ★★★★★
Based on 2281 reviews
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Kit Clayton
Fort Morgan, US
★★★★★ 5
Spark-tacular Revival for My Lawn Chariot
Ordered this OEM 2-pack of Champion spark plugs (Kohler 25 132 23-S / 2513223S) for my Kohler Command K OHV 7000 series (KT725) engine, and let me tell you—these little lightning bolts mean business. Installation? Easier than pretending I’ll read the whole owner’s manual. Pulled the old plugs, threaded these pre-gapped beauties in, torqued appropriately, reconnected, and boom—instant ignition enthusiasm. The engine fired up like it had just downed a double espresso. It’s still too early in the season to mow, but I couldn’t resist a test run. Converted the tractor mower into a full-blown leaf-blasting machine and sent it down my 1/10-mile driveway like a suburban hurricane. Leaves scattered. Neighbors stared. Power was smooth, responsive, and downright smug. Idle is steady. Throttle response is crisp. No sputter, no hesitation—just clean, confident combustion. Exactly what you want from OEM-spec plugs. If your tractor’s been sounding like it’s negotiating with itself before starting, do it a favor. These plugs brought mine back to “runs like a champ”… which, given the name, feels poetically correct. Five stars. Lawn domination pending.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 16, 2026
M
Verified Purchase
MIKE PERKS
Dallas, US
★★★★★ 5
Amazon makes it so easy
Perfect fit, exact replacement part.
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Reviewed in the United States on May 13, 2026
T
Verified Purchase
TMC
Louisville, US
★★★★★ 5
Reliable and well priced
Works very well in my Cub Cadet XT1
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Reviewed in the United States on May 20, 2026
J
Verified Purchase
Jim Chapman
Fort Morgan, US
★★★★★ 5
Installed them works good.
Value for the money.
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Reviewed in the United States on March 10, 2026
B
Verified Purchase
Big Earl
Charlottesville, US
★★★★★ 5
Good Plug if you need this model
These are the OEM for Kohler 7000 series I did service on. They needed to be gapped but that’s every spark plug.
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Reviewed in the United States on May 19, 2026

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