SKU: 87456204644

KEF Kube8b Subwoofer

Sale price$562.50 Regular price$625.00
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Description

KEF Kube8b Subwoofer8 inches bass driver active subwoofer Don't let its compact size fool you, the Kube 8b may not take up much space but the bass it delivers is anything but small. With an 8 inches driver the Kube8b is perfect for smaller living rooms. It shares the 300 Watts Class D amp from the bigger Kubes and has iBX technology to extend the bass depth dynamically. Hear new dimensions in sound with Kube subwoofers The Kube 8b effortlessly unleashes explosive power.

8 inches bass driver active subwoofer

Don't let its compact size fool you, the Kube 8b may not take up much space but the bass it delivers is anything but small. With an 8 inches driver the Kube8b is perfect for smaller living rooms. It shares the 300 Watts Class D amp from the bigger Kubes and has iBX technology to extend the bass depth dynamically.

Hear new dimensions in sound with Kube subwoofers

The Kube 8b effortlessly unleashes explosive power. iBX technology extends the bass depth dynamically and KEF’s unique ability to design, build and integrate the driver in-house takes optimisation to a whole new level. Delivering immersive music and home theatre sound that takes you to the heart of the performance.

Immersiveness

Go deep or go home. KEF’s design and engineering team worked in chorus to develop iBX. This Intelligent Bass Extension algorithm creates an extended depth that unlocks the full potential of the custom driver. Giving you unparalleled precision and ultimate synchronicity between amplifier, driver and sealed cabinet.

Easy configuration

Kube subwoofers offer unmatched set up flexibility. A range of LFE, line and speaker-level inputs, phase selection and DSP controlled EQ settings help you get the best from a Kube. Put it in a convenient place, match it to any main speaker or type of music system and start exploring new depths in the sound.

Integration

KEF is quite possibly the only high-end manufacturer that designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration means we are committed to pure sound and the Kube stays true to that ideal. The result is a driver and amplifier that are perfectly in tune.

Specifications

Weight 11.3kg
Dimensions (with Rear panel and feet / H x W x D) 293 x 293 x 310mm (11.5 x 11.5 x 12.2in.)
Design Powered Subwoofer (sealed)
Power Requirements  100V - 120V / 220V - 240V ~ 50 / 60Hz
Unit Measurement  Piece
Variable Low Pass Filter 40Hz - 140Hz & LFE
Frequency Response  34 to 140Hz (-6dB)
Maximum Output  105dB
Recommended Amplifier Power  300 Watts RMS
Amplifier Type  Built-in Class-D
Drive Units  1 x 200mm (8in.)
Inputs  RCA phono sockets Speaker level inputs
Analogue Input  RCA phono sockets Speaker level inputs
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 87456204644

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Yolanda
Houston, US
★★★★★ 5
Cooling Blanket for Hot Sleepers, Soft Lightweight Comfort with a Cool-to-the-Touch Feel
This reversible cooling blanket is a great option for anyone who sleeps warm. It’s incredibly soft, very lightweight, and has that instantly cool-to-the-touch feel that makes it especially comfortable for hot sleepers. What I liked most is how airy and breathable it feels without being heavy or stuffy. It’s comfortable enough to use all night and gives that nice cooling sensation when you first pull it over you. The softness also makes it feel cozy without sacrificing the lightweight design. My only real wish is that it came with a matching pillowcase, because that would make it feel even more complete as a sleep set. Pros: Extremely soft and comfortable Cool to the touch Lightweight and airy feel Great for hot sleepers Breathable without feeling heavy Cons: Does not include a matching pillowcase Verdict: If you tend to sleep hot, this is a really nice lightweight cooling blanket. It’s soft, breathable, and comfortable with a refreshing cool feel. I just wish it included a pillowcase to make the set feel complete
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2026
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Verified Purchase
Bata
Belleville, US
★★★★★ 4
Cool & comfy
Color: Dark Gray Seersucker, Size: King(108"x90")
Cool but not as cold as I wanted Very soft and comfy though
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026
L
Lola D.
Massapequa, US
★★★★★ 5
Cooling Blanket is a sleep saver for me!
This is the second product I have used from bedsmile and as with the other one, this is a great product! It truly is a cooling blanket. I am a very hot sleeper and live in a hot, humid climate, so this has been a sleep saver for me! One side is silky smooth and feels so good on your skin. The other side has a texture to it which is great if you want to use it as your only bedding, which I do. It covers well and hangs over the edges as it should. I ordered the white one and it is bright and unblemished. The silky side magically feels much cooler than typical bedding and keeps me cooler during the night. It is lightweight but heavy enough to make you feel that you are "under the covers". In my opinion, putting additional covers over it would defeat the purpose but if you live in a cooler climate, it would still be beneficial to use this blanket as the silky coolness would help get a good night's sleep anywhere. Another great benefit of this product is that it does not have any strange odors when unpacking. I did wash it before using, but honestly, I am not sure it was necessary.
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Reviewed in the United States on March 20, 2026
P
Verified Purchase
Paubla Maya
Belleville, US
★★★★★ 5
Incredible Value - Soft, Stays in Place, and Military Son Approved!
Size: California King, Size: California King
I purchased this mattress topper for under $27 and I'm so impressed that I'm planning to buy another one! Easy Installation & Perfect Fit: This topper was incredibly easy to put on, and it fits my California King mattress perfectly. The 18-inch deep pockets ensure it stays in place - I can move around on the bed and it doesn't shift at all. Comfort: The topper is wonderfully soft and has made a noticeable difference in our sleep quality. My husband absolutely loves it, and we both wake up feeling more rested. The Ultimate Test: My son recently came home after being deployed for a year. He slept on our bed for hours and immediately commented on how soft and comfortable it was. That's saying something for someone who's been sleeping on military accommodations! He was so impressed that he's planning to buy one for his ship. Bottom Line: For the price, comfort, and quality, I recommend this 100%. It's hypoallergenic, stays in place, and has exceeded all our expectations. You can't go wrong with this purchase!
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Reviewed in the United States on November 5, 2025
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Verified Purchase
Pat Onstott
Fort Morgan, US
★★★★★ 5
Nice mattress Topper Pad
Size: Queen
Met my expectations and was just as advertised. Good fit; comfortable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 20, 2026

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