HK Audio LINEAR SUB 4000 2400 Watt 18" Passive Subwoofer

Marsoni

M251S

$1299.50

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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We offer a 30-day return/exchange service after receiving.
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I’ve been using these for several days now and I did notice a difference. I tend to get hot while sleeping, so I was curious if they would actually help, and they do feel cool when you lay on them. I also like that they’re soft and comfortable, not that weird texture some “cooling” products have. So far, I’ve been really happy with them.

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Reviewed in the United States on May 23, 2026

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Iris

Carnegie, US

★★★★★ 5

Definitely recommend

Color: White, Size: Queen (20" X 30")

I highly recommend this pillow case. With two sides it is easy to stay comfortable as the weather changes. The cooling side is nicely cool to touch and both sides are incredibly soft. The size is also good.

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Reviewed in the United States on May 26, 2026

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Marcus Meiklejohn

Port Orchard, US

★★★★★ 5

Nice & cool

Color: Beige, Size: King (20" X 36")

These are the best pillowcases! I love having a cooling side for summer and a warm side for winter. I can't imagine switching back to normal cotton pillowcases after using these. They zip on so they stay on unlike regular pillowcases.

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Reviewed in the United States on May 11, 2026

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ROB

Lowell, US

★★★★★ 4

Nice pillowcases that stay cool

very soft and seem to stay cool!

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Reviewed in the United States on April 29, 2026

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SARAH HAPNER