Short answer: the HSU Research VTF-1 MK3 for deeper bass, the VTF-1 MK2 for value. The MK3 is a 10-inch ported design with 250W RMS that reaches 25Hz in single-port mode, and it ranks #63 of 212 against the MK2 #93 of 212. The MK2 is a 10-inch ported sub with 200W RMS offering excellent value and compact size, though its bass does not reach as deep.

Buy the HSU Research VTF-1 MK3 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, start with the Monoprice SW-12 instead.
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Specifications Side By Side
| HSU Research VTF-1 MK2 | HSU Research VTF-1 MK3 | |
|---|---|---|
| Price | $699 Discontinued | $749 Discontinued |
| Ranked | #93 of 212 in Medium Home Subwoofers (30-75 lbs) | #63 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Warranty | 7/2 | 7/2(+3) |
| Enclosure | ported, rear | ported, front |
| Output SPL at 25 Hz | 87.9 dB | 96.2 dB |
| Output SPL at 31.5 Hz | 105.1 dB | 108.6 dB |
| Output SPL at 40 Hz | 111.4 dB | 113.8 dB |
| Output SPL at 50 Hz | 113.2 dB | 115.0 dB |
| Output SPL at 63 Hz | 114.0 dB | 115.2 dB |
| Output SPL at 80 Hz | 113.0 dB | 113.6 dB |
| CEA-2010-A Average (40-80Hz) | 112.9 dB | 114.4 dB |
| Dimensions | 18”H x 14”W x 17”D (457.2 x 355.6 x 431.8 mm) | 19.5”H x 14.5”W x 19”D (495.3 x 368.3 x 482.6 mm) |
| Weight | 42.1 lbs (19.1 kg) | 42.1 lbs (19.1 kg) |
| Country | United States | United States |
| Measurement Source | Manufacturer | Audioholics |
| Amplifier Power | 200W RMS | 250W RMS / 1000W peak |
| Frequency Response | 25-32Hz | 25Hz (ported) |
| Drivers | 10” (254mm) driver | 10” (254mm) driver |
| Output SPL at 20 Hz | - | 93.5 dB |
| Output SPL at 100 Hz | - | 111.7 dB |
| Output SPL at 125 Hz | - | 110.4 dB |
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