Sonos Sub 4 vs KEF Kube 8 MIE

Short answer: the Sonos Sub 4. It ranks #10 of 73 subwoofers by sound quality, rated 3.7/5, at $749. The KEF Kube 8 MIE ranks #21, rated 3.6/5, at $699.99, $49.01 cheaper, which does not close the gap in sound quality.

The case for the Sonos Sub 4: Two force-cancelling drivers face each other to cut cabinet buzz and rattle, and Sonos rates bass down to 25Hz. The tradeoff: No independent measurements yet, so its output can’t be compared with ranked subwoofers.

The case for the KEF Kube 8 MIE: Compact sealed enclosure with an 8-inch front-firing long-throw driver powered by a 300W Class-D amplifier. The tradeoff: 8-inch sealed driver rolls off below 34Hz (-6dB) and tops out at 105dB max SPL, which limits visceral home-theater infrasonic punch in medium to large rooms compared with larger subwoofers.

Buy the Sonos Sub 4. It is rated higher for sound quality, and the $49.01 saving on the KEF Kube 8 MIE is not enough to make up the difference.

About the ratings: neither speaker has been measured yet, so both ratings are estimated from measured siblings and predecessors (likely ranges: Sonos Sub 4 3.5 to 3.9; KEF Kube 8 MIE 3.4 to 3.8). Treat this verdict as provisional.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

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More worthwhile head-to-heads for Sonos Sub 4:

• Sonos Sub 4 vs SVS 3000 Micro R|Evolution
• Sonos Sub 4 vs Sonos Sub (Gen 1)
• SVS 3000 Micro vs KEF Kube 8 MIE
• SVS SB-1000 PRO vs KEF Kube 8 MIE
• Sonos Sub 4 vs Rythmik LV12

Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.

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The Two Speakers In Full

Sonos Sub 4: $749.00 Estimated Amazon eBay

Older models: the Sonos Sub (Gen 3) (estimated 3.7/5), the Sonos Sub (Gen 2) (estimated 3.7/5) and the Sonos Sub (Gen 1) (rated 3.7/5). See every Sonos Sub generation.

Same family: the Sonos Sub Mini (smaller subwoofer, ranked lower, rated 3.2/5).

Pros: Two force-cancelling drivers face each other to cut cabinet buzz and rattle, and Sonos rates bass down to 25Hz. Connects to a Sonos soundbar or speaker over Wi-Fi, so it can go anywhere with a power outlet, and sets up from the Sonos app.

Cons: No independent measurements yet, so its output can’t be compared with ranked subwoofers. It only works with Sonos soundbars and speakers, with no line-level input for any other system.

Full Sonos Sub 4 review and specifications →

Released	Oct 2024 (2 years ago)
Cabinet Color	black, white
Country	United States
Dimensions	15.3”H x 15.8”W x 6.2”D (389 x 402 x 158 mm)
Drivers	2x force-cancelling drivers
Enclosure	ported, force-cancelling
Frequency Response	25Hz extension (manufacturer specified)
Warranty	1
Weight	26 lbs (11.79 kg)

• Links
  • Official Sonos Sub 4 Website
• Reviews, Comparisons and Sound Samples
  • No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
• Head-to-Head Comparisons
  • Sonos Sub 4 vs SVS 3000 Micro R|Evolution
  • Sonos Sub 4 vs HSU Research ULS-15 MK2
  • Sonos Sub 4 vs Rythmik LV12
  • Sonos Sub 4 vs Sonos Sub (Gen 1)

KEF Kube 8 MIE: $699.99 Estimated Amazon KEF eBay

Same family: the KEF Kube 10 MIE (larger subwoofer, ranked higher, estimated 3.7/5), the KEF Kube 12 MIE (larger subwoofer, estimated 3.7/5) and the KEF Kube 15 MIE (larger subwoofer, estimated 3.8/5). See every KEF Kube generation.

Pros: Compact sealed enclosure with an 8-inch front-firing long-throw driver powered by a 300W Class-D amplifier. KEF Music Integrity Engine (MIE) DSP algorithm applies real-time iBX dynamic bass extension and three room-position EQ presets (wall/corner/cabinet). Accepts speaker-level and line-level inputs, plus KEF KW1 wireless kit integration.

Cons: 8-inch sealed driver rolls off below 34Hz (-6dB) and tops out at 105dB max SPL, which limits visceral home-theater infrasonic punch in medium to large rooms compared with larger subwoofers.

Full KEF Kube 8 MIE review and specifications →

Released	Mar 2024 (2 years ago)
Amplifier Power	300W
Cabinet Color	black
Country	United Kingdom
Dimensions	11.5”H x 11.5”W x 12.2”D (293 x 293 x 310 mm)
Drivers	8” driver
Enclosure	sealed
Frequency Response	34Hz - 140Hz (-6dB) (manufacturer specified)
Maximum SPL	105 dB
Warranty	5/2
Weight	20.7 lbs (9.4 kg)

• Links
  • Official KEF Kube 8 MIE Website
• Reviews, Comparisons and Sound Samples
  • No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
• Head-to-Head Comparisons
  • KEF Kube 8 MIE vs SVS 3000 Micro
  • KEF Kube 8 MIE vs SVS SB-1000 PRO