Short answer: both are discontinued, so this only matters if you are buying used. Used, the MartinLogan Dynamo 1600X is the better pick: it ranks #3 of 212 subwoofers by sound quality (rated 4.2/5), against #104 (rated 3.7/5) for the PSB Speakers SubSeries 250.
The MartinLogan Dynamo 1600X is the better-sounding pick. A sealed 15 inch subwoofer with forceful, tight bass, front or down firing setup, and app based room correction, now discontinued. The catch: Output falls to 86.2dB at 15Hz, so the very lowest effects are weaker than the strong midbass numbers suggest.
Why pick the PSB Speakers SubSeries 250: A compact sealed 10 inch subwoofer for smaller rooms and tight spaces, now discontinued. Watch for: Output at 31.5Hz is 102.2dB and 96.7dB at 25Hz, so it is not for large rooms or loud movie effects.
Buy the MartinLogan Dynamo 1600X only if you find one used in good condition; both are discontinued, and it is the better rated of the two.
Still deciding? The full Subwoofers rankings cover every ranked option.
A sealed 15 inch subwoofer with forceful, tight bass, front or down firing setup, and app based room correction, now discontinued.
A compact sealed 10 inch subwoofer for smaller rooms and tight spaces, now discontinued.
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Specifications Side By Side
| MartinLogan Dynamo 1600X | PSB Speakers SubSeries 250 | |
|---|---|---|
| Price | $1,606.77 Discontinued | $584.28 Discontinued |
| Ranked | #3 of 212 in Medium Home Subwoofers (30-75 lbs) | #104 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | sealed | sealed |
| Output SPL at 15 Hz | 86.2 dB | - |
| Output SPL at 20 Hz | 99.4 dB | 92.5 dB |
| Output SPL at 25 Hz | 103.9 dB | 96.7 dB |
| Output SPL at 31.5 Hz | 111.7 dB | 102.2 dB |
| Output SPL at 40 Hz | 118.4 dB | 106.9 dB |
| Output SPL at 50 Hz | 121.0 dB | 111.0 dB |
| Output SPL at 63 Hz | 121.8 dB | 115.7 dB |
| Output SPL at 80 Hz | 121.0 dB | 116.6 dB |
| Output SPL at 100 Hz | 120.2 dB | - |
| Output SPL at 125 Hz | 119.0 dB | - |
| CEA-2010-A Average (40-80Hz) | 120.5 dB | 112.5 dB |
| Dimensions | 20.1”H x 17.9”W x 19.1”D (510.5 x 454.7 x 485.1 mm) | 14.2”H x 13.6”W x 14.4”D (361.9 x 345.9 x 365.0 mm) |
| Weight | 56 lbs (25.4 kg) | 35.5 lbs (16.1 kg) |
| Warranty | 3 | 5 |
| Cabinet Color | black | black |
| Country | United States | Canada |
| Measurement Source | Audioholics | Brent Butterworth |
| Frequency Response | 20-200Hz, ±3dB | 20Hz+ |
| Amplifier Power | 900W RMS / 1800W peak | 200W RMS |
| Inputs | RCA (stereo and LFE), XLR (LFE), speaker-level (banana) | - |
| Drivers | 15” (381mm) driver | 10” (254mm) driver |
| 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 | - |
| Output SPL at 16 Hz | - | 90.0 dB |
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