Short answer: the HSU Research ULS-15 MK2. It ranks #4 of 212 subwoofers by sound quality, rated 4.2/5, at $999. The KEF Kube 10 MIE ranks #11, rated 3.7/5, at $699.99, $299.01 cheaper, not enough of a saving to outweigh the sound-quality gap.
Why pick the KEF Kube 10 MIE: A sealed 10 inch subwoofer with a 300 watt amp and bass processing, easy to place and suited to music. The catch: No independent measurements yet, so its output can’t be compared with ranked subwoofers.
Why pick the HSU Research ULS-15 MK2: A sealed 15 inch subwoofer with tight, accurate bass, a great value in large subs. Watch for: No phone app or room correction, so setup is manual, and it ships in a plain vinyl finish where a similarly priced SVS offers gloss black.
Buy the HSU Research ULS-15 MK2. It is rated higher for sound quality, and the $299.01 you would save on the KEF Kube 10 MIE does not close the gap.
Worth knowing: the KEF Kube 10 MIE has not been measured yet. Its rating is estimated from related models, with a likely range of 3.5 to 3.9, so treat this verdict as provisional.
Still deciding? The full Subwoofers rankings cover every ranked option.
Prices on this page were last checked November 14, 2026 at 6:17 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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Specifications Side By Side
| KEF Kube 10 MIE | HSU Research ULS-15 MK2 | |
|---|---|---|
| Price | $699.99 | $999.00 |
| Ranked | #11 of 73 in Small Home Subwoofers (Under 30 lbs) Estimated | #4 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Weight | 34 lbs (15.4 kg) | 65 lbs (29.5 kg) |
| Dimensions | 14.6”H x 13.9”W x 14.6”D (370 x 353 x 370 mm) | 19”H x 18”W x 19.5”D (482.6 x 457.2 x 495.3 mm) |
| Warranty | 5/2 | 7/2(+3) |
| Enclosure | sealed | sealed |
| Drivers | 10” driver | 15” (381mm) driver |
| Amplifier Power | 300W | 600W RMS / 2000W peak |
| Cabinet Color | black | black, wood |
| Country | United Kingdom | United States |
| Output SPL at 12.5 Hz | - | 93.7 dB |
| Output SPL at 15 Hz | - | 98.0 dB |
| Output SPL at 20 Hz | - | 102.4 dB |
| Output SPL at 25 Hz | - | 107.7 dB |
| Output SPL at 31.5 Hz | - | 113.4 dB |
| Output SPL at 40 Hz | - | 118.3 dB |
| Output SPL at 50 Hz | - | 120.8 dB |
| Output SPL at 63 Hz | - | 121.2 dB |
| Output SPL at 80 Hz | - | 121.1 dB |
| Output SPL at 100 Hz | - | 120.7 dB |
| Output SPL at 125 Hz | - | 120.7 dB |
| CEA-2010-A Average (40-80Hz) | - | 120.3 dB |
| Measurement Source | - | Audioholics |
| Frequency Response | - | 20-200Hz, ±1dB |
| Crossover Frequency | - | 30-90Hz adjustable |
| Phase Control | - | 0°-180° |
| Features | - | Q control, sealed subwoofer, EQ1/EQ2 modes |
Where the Ratings Come From
- KEF Kube 10 MIE: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
- HSU Research ULS-15 MK2: manufacturer specifications and listening comparisons; no independent measurement has been published yet.
This comparison is generated from the ratings, specifications and measurements on each product’s own page, and it updates when that data changes. How we rank explains how each rating is decided.
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