Short answer: the MartinLogan Dynamo 1600X for output, the HSU Research ULS-15 MK2 for value. The Dynamo 1600X is a sealed 15-inch with 900W RMS and 1800W peak that delivers forceful, clean, tight low bass, though our notes flag its mid-range 121.5 dB output as a catch. The ULS-15 MK2’s sealed design delivers tight, accurate bass with low bloat and it costs $607.77 less.
Buy the HSU Research ULS-15 MK2 if you want one new; the MartinLogan Dynamo 1600X is discontinued, so only look for it used.
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Specifications Side By Side
| HSU Research ULS-15 MK2 | MartinLogan Dynamo 1600X | |
|---|---|---|
| Price | $999.00 | $1,606.77 Discontinued |
| Ranked | #4 of 212 in Medium Home Subwoofers (30-75 lbs) | #3 of 212 in Medium 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”H x 18”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 |
| Amplifier Power | 600W RMS / 2000W peak | 900W RMS / 1800W peak |
| Crossover Frequency | 30-90Hz adjustable | - |
| Phase Control | 0°-180° | - |
| Features | Q control, sealed subwoofer, EQ1/EQ2 modes | - |
| Drivers | 15” (381mm) driver | 15” (381mm) driver |
| Inputs | - | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) |
| XLR Input | - | Yes |
| RCA Input | - | Yes |
| TRS Input | - | No |
| Optical Input | - | No |
| Coaxial Input | - | No |
| USB Input | - | No |
| HDMI Input | - | No |
| AES Input | - | No |
| Aux Input | - | No |
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