Short answer: the HSU Research ULS-15 MK2. It ranks #3 of 137 subwoofers at $1035; the Kef KC62 ranks #137 and costs $1519.99, so there is not much of a tradeoff to weigh.
The case for the HSU Research ULS-15 MK2: Sealed design delivers tight, accurate bass with low bloat.
What the Kef KC62 gets right: Dual 6.5-inch force-canceling drivers with 1000W in ultra-compact basketball-sized sealed enclosure.
Buy the HSU Research ULS-15 MK2 if the ranking matters more than the price. Buy the Kef KC62 if the price matters more than the ranking.
Specifications Side By Side
| HSU Research ULS-15 MK2 | Kef KC62 | |
|---|---|---|
| Price | $1,035 | $1,519.99 |
| Ranked | #3 of 137 in Medium Powered Home Subwoofers (30-75 lbs) | #137 of 137 in Medium Powered Home Subwoofers (30-75 lbs) |
| Enclosure | sealed | sealed |
| 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 | 80.0 dB |
| Output SPL at 25 Hz | 107.7 dB | 84.6 dB |
| Output SPL at 31.5 Hz | 113.4 dB | 88.5 dB |
| Output SPL at 40 Hz | 118.3 dB | 92.2 dB |
| Output SPL at 50 Hz | 120.8 dB | 95.1 dB |
| Output SPL at 63 Hz | 121.2 dB | 97.7 dB |
| Output SPL at 80 Hz | 121.1 dB | 102.6 dB |
| Output SPL at 100 Hz | 120.7 dB | 104.2 dB |
| Output SPL at 125 Hz | 120.7 dB | - |
| CEA-2010-A Average (40-80Hz) | 120.3 dB | 96.9 dB |
| Dimensions | 19.0"H x 18.0"W x 19.5"D (482.6 x 457.2 x 495.3 mm) | 9.68"H x 10.07"W x 9.76"D (245.9 x 255.8 x 247.9 mm) |
| Weight | 65 lbs / 29.5 kg | 30.9 lbs / 14.0 kg |
| Warranty | 7/2(+3) | 5/2/5 |
| Cabinet Color | black, wood | black, white |
| Country | United States | United Kingdom |
| Measurement Source | Audioholics | ErinsAudioCorner |
| Frequency Response | 20-200Hz, ±1dB | 11-200Hz |
| Power Output (Watts) | 600W RMS / 2000W peak | 1000W RMS |
| Crossover | 30-90Hz adjustable | - |
| Phase Control | 0°-180° | - |
| Features | Q control, sealed subwoofer, EQ1/EQ2 modes | - |
| Drivers | 15" (381mm) driver | 2x 6.5" (165mm) driver |
The Two Speakers In Full
HSU Research ULS-15 MK2: $1,035
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 at under $850 shipped.
Notes: Price includes shipping
| CEA-2010-A Average (40-80Hz) | 120.3 dB |
|---|---|
| Cabinet Color | black, wood |
| Country | United States |
| Crossover | 30-90Hz adjustable |
| Dimensions | 19.0"H x 18.0"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° |
| Power Output (Watts) | 600W RMS / 2000W peak |
| Warranty | 7/2(+3) |
| Weight | 65 lbs / 29.5 kg |
- Head-to-Head Comparisons
- HSU Research ULS-15 MK2 vs MartinLogan Dynamo 1600X
- HSU Research ULS-15 MK2 vs Power Sound Audio (PSA) XV15
- HSU Research ULS-15 MK2 vs JTR Speakers Captivator 212PRO
- 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 SVS PB-1000 PRO
- HSU Research ULS-15 MK2 vs Monoprice SW-12
- See all 14 comparisons
- Links
Kef KC62: $1,519.99 Amazon
Pros: Dual 6.5-inch force-canceling drivers with 1000W in ultra-compact basketball-sized sealed enclosure. Deep extension to 11Hz with five room placement EQ presets. Elegant design fits any décor.
| CEA-2010-A Average (40-80Hz) | 96.9 dB |
|---|---|
| Cabinet Color | black, white |
| Country | United Kingdom |
| Dimensions | 9.68"H x 10.07"W x 9.76"D (245.9 x 255.8 x 247.9 mm) |
| Drivers | 2x 6.5" (165mm) driver |
| Enclosure | sealed |
| Frequency Response | 11-200Hz |
| Measurement Source | ErinsAudioCorner |
| Output SPL at 20 Hz | 80.0 dB |
| Output SPL at 25 Hz | 84.6 dB |
| Output SPL at 31.5 Hz | 88.5 dB |
| Output SPL at 40 Hz | 92.2 dB |
| Output SPL at 50 Hz | 95.1 dB |
| Output SPL at 63 Hz | 97.7 dB |
| Output SPL at 80 Hz | 102.6 dB |
| Output SPL at 100 Hz | 104.2 dB |
| Power Output (Watts) | 1000W RMS |
| Warranty | 5/2/5 |
| Weight | 30.9 lbs / 14.0 kg |
- Head-to-Head Comparisons
- Links
As an Amazon Associate I earn from qualifying purchases.
Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.