Short answer: the HSU Research VTF-15H MK2 for output, the Power Sound Audio (PSA) XS15SE for a sealed cabinet. The HSU’s 15-inch ported driver delivers a 121.8dB CEA-2010-A average against the XS15SE’s 117.8dB, but the ported design is prone to room modes and the 50 kg (110.2 lbs) cabinet is mid-large. The XS15SE’s compact sealed enclosure gives up that output.

Buy the HSU Research VTF-15H MK2 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, buy the HSU Research VTF-TN1, which replaces the HSU Research VTF-15H MK2.
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Specifications Side By Side
| HSU Research VTF-15H MK2 | Power Sound Audio (PSA) XS15SE | |
|---|---|---|
| Price | $1,499 Discontinued | $1,499 Discontinued |
| Ranked | #57 of 143 in Large Home Subwoofers (Over 75 lbs) | #30 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 15 Hz | 101.6 dB | 96.5 dB |
| Output SPL at 20 Hz | 108.4 dB | 100.6 dB |
| Output SPL at 25 Hz | 114.8 dB | 107.2 dB |
| Output SPL at 31.5 Hz | 119.4 dB | 110.6 dB |
| Output SPL at 40 Hz | 122.9 dB | 114.7 dB |
| Output SPL at 50 Hz | 122.5 dB | 117.9 dB |
| Output SPL at 63 Hz | 121.1 dB | 119.1 dB |
| Output SPL at 80 Hz | 120.5 dB | 119.4 dB |
| CEA-2010-A Average (40-80Hz) | 121.8 dB | 117.8 dB |
| Dimensions | 24”H x 18”W x 26”D (609.6 x 457.2 x 660.4 mm) | 19.5”H x 17”W x 18”D (495.3 x 431.8 x 457.2 mm) |
| Weight | 110 lbs (49.9 kg) | 67 lbs (30.4 kg) |
| Warranty | 7/2(+3) | 5 |
| Cabinet Color | black, wood | - |
| Country | United States | United States |
| Measurement Source | Manufacturer | Data-bass |
| Drivers | 15” (381mm) driver | 15” (381mm) driver |
| Output SPL at 12.5 Hz | - | 91.9 dB |
| Output SPL at 100 Hz | - | 119.3 dB |
| Output SPL at 125 Hz | - | 118.6 dB |
| Frequency Response | - | 23-200Hz, ±3dB |
| Amplifier Power | - | 550W RMS / 1650W peak |
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