Short answer: the HSU Research ULS-15 MK2 has been measured and ranked among subwoofers; the KEF Kube 10 MIE has not been independently measured yet, so until it is, this comes down to features and price.
The case for the KEF Kube 10 MIE: Sealed cabinet with a 10-inch driver and 300W of amplification, tuned by KEF’s Music Integrity Engine DSP.
On the HSU Research ULS-15 MK2 side: Sealed design delivers tight, accurate bass with low bloat.
On paper: The HSU Research ULS-15 MK2 has more amplifier power, 600W against 300W.
Price: the KEF Kube 10 MIE lists at $899.99 and the HSU Research ULS-15 MK2 at $999.
Buy the HSU Research ULS-15 MK2 if you want a speaker whose sound quality has been measured and ranked. It also has more power.
Buy the KEF Kube 10 MIE if you prefer its design or features, and you can wait for measurements to confirm how it sounds.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| KEF Kube 10 MIE | HSU Research ULS-15 MK2 | |
|---|---|---|
| Price | $899.99 | $1,035 |
| Ranked | - | #3 of 145 in Medium Home Subwoofers (30-75 lbs) |
| 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 |
| Dimensions | - | 19”H x 18”W x 19.5”D (482.6 x 457.2 x 495.3 mm) |
| Weight | - | 65 lbs (29.5 kg) |
| Warranty | - | 7/2(+3) |
| 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 |
Prices on this page were last checked September 29, 2026 at 3:43 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
KEF Kube 10 MIE: $899.99 KEF eBay
Older model: the Kef Kube 10B (rated 3.7/5).
Pros: Sealed cabinet with a 10-inch driver and 300W of amplification, tuned by KEF’s Music Integrity Engine DSP. The sealed design is easier to place than a ported one and suits music.
Cons: No independent measurements yet, so its output can’t be compared with ranked subwoofers. A single 10-inch sealed driver limits deep output in a large room.
Full KEF Kube 10 MIE review and specifications →
| Amplifier Power | 300W |
|---|---|
| Cabinet Color | black |
| Country | United Kingdom |
| Drivers | 10” driver |
| Enclosure | sealed |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
HSU Research ULS-15 MK2: $1,035 HSU Research eBay
Pros: Sealed design delivers tight, accurate bass with low bloat. 600W BASH amplifier. 30% less expensive and 20 lbs lighter than predecessor. Easy integration with Q and EQ controls. Great value in the 15” sub market.
Notes: Price includes shipping
Full HSU Research ULS-15 MK2 review and specifications →
| Amplifier Power | 600W RMS / 2000W peak |
|---|---|
| CEA-2010-A Average (40-80Hz) | 120.3 dB |
| Cabinet Color | black, wood |
| Country | United States |
| Crossover Frequency | 30-90Hz adjustable |
| Dimensions | 19”H x 18”W x 19.5”D (482.6 x 457.2 x 495.3 mm) |
| Drivers | 15” (381mm) driver |
| Enclosure | sealed |
| Features | Q control, sealed subwoofer, EQ1/EQ2 modes |
| Frequency Response | 20-200Hz, ±1dB |
| Measurement Source | Audioholics |
| 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 |
| Phase Control | 0°-180° |
| Warranty | 7/2(+3) |
| Weight | 65 lbs (29.5 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- HSU Research ULS-15 MK2 vs MartinLogan Dynamo 1600X
- HSU Research ULS-15 MK2 vs JTR Speakers Captivator 212PRO
- HSU Research ULS-15 MK2 vs Monoprice SW-12
- HSU Research ULS-15 MK2 vs Power Sound Audio (PSA) XV15
- HSU Research ULS-15 MK2 vs Paradigm Defiance X12
- HSU Research ULS-15 MK2 vs Monoprice SW-15
- HSU Research ULS-15 MK2 vs SVS SB-3000
- HSU Research ULS-15 MK2 vs Klipsch SPL-120
- See all 22 comparisons