Short answer: the MartinLogan Dynamo 1600X for the higher ranking, the HSU Research ULS-15 MK2 for the lower price. The MartinLogan Dynamo 1600X ranks #2 of 137 subwoofers at $1606.77. The HSU Research ULS-15 MK2 ranks #3 at $1035, $571.77 cheaper.
On the HSU Research ULS-15 MK2 side: Sealed design delivers tight, accurate bass with low bloat.
The case for the MartinLogan Dynamo 1600X: Sealed 15-inch with 900W RMS, 1800W peak delivers forceful clean tight low bass. The catch: Ported design room integration needs, mid-range 121.5 dB output, and $1,607 price.
Buy the HSU Research ULS-15 MK2 if the price matters more than the ranking. Buy the MartinLogan Dynamo 1600X if the ranking matters more than the price.
Specifications Side By Side
| HSU Research ULS-15 MK2 | MartinLogan Dynamo 1600X | |
|---|---|---|
| Price | $1,035 | $1,606.77 |
| Ranked | #3 of 137 in Medium Powered Home Subwoofers (30-75 lbs) | #2 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 | 86.2 dB |
| Output SPL at 20 Hz | 102.4 dB | 99.4 dB |
| Output SPL at 25 Hz | 107.7 dB | 103.9 dB |
| Output SPL at 31.5 Hz | 113.4 dB | 111.7 dB |
| Output SPL at 40 Hz | 118.3 dB | 118.4 dB |
| Output SPL at 50 Hz | 120.8 dB | 121.0 dB |
| Output SPL at 63 Hz | 121.2 dB | 121.8 dB |
| Output SPL at 80 Hz | 121.1 dB | 121.0 dB |
| Output SPL at 100 Hz | 120.7 dB | 120.2 dB |
| Output SPL at 125 Hz | 120.7 dB | 119.0 dB |
| CEA-2010-A Average (40-80Hz) | 120.3 dB | 120.5 dB |
| Dimensions | 19.0"H x 18.0"W x 19.5"D (482.6 x 457.2 x 495.3 mm) | 20.1"H x 17.9"W x 19.1"D (510.5 x 454.7 x 485.1 mm) |
| Weight | 65 lbs / 29.5 kg | 56 lbs / 25.4 kg |
| Warranty | 7/2(+3) | 3 |
| Cabinet Color | black, wood | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Audioholics |
| Frequency Response | 20-200Hz, ±1dB | 20-200Hz, ±3dB |
| Power Output (Watts) | 600W RMS / 2000W peak | 900W RMS / 1800W peak |
| Crossover | 30-90Hz adjustable | - |
| Phase Control | 0°-180° | - |
| Features | Q control, sealed subwoofer, EQ1/EQ2 modes | - |
| Drivers | 15" (381mm) driver | 15" (381mm) driver |
| Input Connections | - | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) |
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 |
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MartinLogan Dynamo 1600X: $1,606.77
Pros: Sealed 15-inch with 900W RMS, 1800W peak delivers forceful clean tight low bass. Easily configurable as forward-firing or down-firing. Smartphone app with Anthem Room Correction (ARC) optimizes bass across room. Wireless capable with optional SWT-X module.
Cons: Ported design room integration needs, mid-range 121.5 dB output, and $1,607 price.
| CEA-2010-A Average (40-80Hz) | 120.5 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 20.1"H x 17.9"W x 19.1"D (510.5 x 454.7 x 485.1 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | sealed |
| Frequency Response | 20-200Hz, ±3dB |
| Input Connections | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 86.2 dB |
| Output SPL at 20 Hz | 99.4 dB |
| Output SPL at 25 Hz | 103.9 dB |
| Output SPL at 31.5 Hz | 111.7 dB |
| Output SPL at 40 Hz | 118.4 dB |
| Output SPL at 50 Hz | 121.0 dB |
| Output SPL at 63 Hz | 121.8 dB |
| Output SPL at 80 Hz | 121.0 dB |
| Output SPL at 100 Hz | 120.2 dB |
| Output SPL at 125 Hz | 119.0 dB |
| Power Output (Watts) | 900W RMS / 1800W peak |
| Warranty | 3 |
| Weight | 56 lbs / 25.4 kg |
- Head-to-Head Comparisons
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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.