Short answer: the HSU Research VTF-15H MK2. It ranks #50 of 110 subwoofers by sound quality, rated 4.2/5, at $1499. The Monoprice Monolith M15-S ranks #72, rated 4.1/5, at $999, $500 cheaper, which does not close the gap in sound quality.
What the HSU Research VTF-15H MK2 gets right: 15-inch ported driver delivers 121.8dB CEA-2010-A average from HSU Research’s long-running VTF series. The catch: Ported enclosure prone to room modes at certain frequencies, mid-large 50 kg (110.2 lbs) size, and $1,500 price point.
Buy the HSU Research VTF-15H MK2. It is rated higher for sound quality, and the $500 saving on the Monoprice Monolith M15-S is not enough to make up the difference.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| HSU Research VTF-15H MK2 | Monoprice Monolith M15-S | |
|---|---|---|
| Price | $1,499 | $999 |
| Ranked | #50 of 110 in Large Home Subwoofers (Over 75 lbs) | #72 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 15 Hz | 101.6 dB | 100.1 dB |
| Output SPL at 20 Hz | 108.4 dB | 105.6 dB |
| Output SPL at 25 Hz | 114.8 dB | 111.2 dB |
| Output SPL at 31.5 Hz | 119.4 dB | 115.2 dB |
| Output SPL at 40 Hz | 122.9 dB | 118.4 dB |
| Output SPL at 50 Hz | 122.5 dB | 119.3 dB |
| Output SPL at 63 Hz | 121.1 dB | 119.6 dB |
| Output SPL at 80 Hz | 120.5 dB | 118.9 dB |
| CEA-2010-A Average (40-80Hz) | 121.8 dB | 119.0 dB |
| Dimensions | 24"H x 18"W x 26"D (609.6 x 457.2 x 660.4 mm) | 23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm) |
| Weight | 110 lbs (49.9 kg) | 80 lbs (36.3 kg) |
| Warranty | 7/2(+3) | 5 |
| Cabinet Color | black, wood | - |
| Country | United States | United States |
| Measurement Source | Manufacturer | Manufacturer |
| Drivers | 15" (381mm) driver | 15" (381mm) driver |
| Output SPL at 100 Hz | - | 119.1 dB |
| Output SPL at 125 Hz | - | 118.9 dB |
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Prices on this page were last checked September 23, 2026 at 11:24 PM UTC. Product prices and availability are accurate as of that date/time 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.
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The Two Speakers In Full
HSU Research VTF-15H MK2: $1,499 eBay
Pros: 15-inch ported driver delivers 121.8dB CEA-2010-A average from HSU Research’s long-running VTF series.
Cons: Ported enclosure prone to room modes at certain frequencies, mid-large 50 kg size, and $1499 price point.
Notes: Price includes shipping
Full HSU Research VTF-15H MK2 review and specifications →
| CEA-2010-A Average (40-80Hz) | 121.8 dB |
|---|---|
| Cabinet Color | black, wood |
| Country | United States |
| Dimensions | 24"H x 18"W x 26"D (609.6 x 457.2 x 660.4 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, front |
| Measurement Source | Manufacturer |
| Output SPL at 15 Hz | 101.6 dB |
| Output SPL at 20 Hz | 108.4 dB |
| Output SPL at 25 Hz | 114.8 dB |
| Output SPL at 31.5 Hz | 119.4 dB |
| Output SPL at 40 Hz | 122.9 dB |
| Output SPL at 50 Hz | 122.5 dB |
| Output SPL at 63 Hz | 121.1 dB |
| Output SPL at 80 Hz | 120.5 dB |
| Warranty | 7/2(+3) |
| Weight | 110 lbs (49.9 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
- HSU Research VTF-15H MK2 vs SVS PB-3000
- HSU Research VTF-15H MK2 vs HSU Research VTF-3 MK5 HP
- HSU Research VTF-15H MK2 vs Rythmik FV15HP
- HSU Research VTF-15H MK2 vs SVS PB-4000
- HSU Research VTF-15H MK2 vs Monoprice Monolith M-15 V2
- HSU Research VTF-15H MK2 vs Chase Home Theater SS18.1
- HSU Research VTF-15H MK2 vs Rythmik F18
- HSU Research VTF-15H MK2 vs JBL 4645C
- See all 22 comparisons
Monoprice Monolith M15-S: $999 eBay
Pros: Published CEA-2010 specifications list 105.6 dB at 20 Hz and 119.0 dB through 40-80 Hz. The sealed enclosure with 15” (381mm) driver has the headroom for demanding film bass in a large room.
Cons: The 596.9H x 424.2W x 500.4D mm cabinet and 36.3 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
Notes: Product # 35141
Full Monoprice Monolith M15-S review and specifications →
| CEA-2010-A Average (40-80Hz) | 119.0 dB |
|---|---|
| Country | United States |
| Dimensions | 23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | sealed |
| Measurement Source | Manufacturer |
| Output SPL at 15 Hz | 100.1 dB |
| Output SPL at 20 Hz | 105.6 dB |
| Output SPL at 25 Hz | 111.2 dB |
| Output SPL at 31.5 Hz | 115.2 dB |
| Output SPL at 40 Hz | 118.4 dB |
| Output SPL at 50 Hz | 119.3 dB |
| Output SPL at 63 Hz | 119.6 dB |
| Output SPL at 80 Hz | 118.9 dB |
| Output SPL at 100 Hz | 119.1 dB |
| Output SPL at 125 Hz | 118.9 dB |
| Warranty | 5 |
| Weight | 80 lbs (36.3 kg) |
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
- Monoprice Monolith M15-S vs Rythmik F18
- Monoprice Monolith M15-S vs Monoprice Monolith M-15 V2
- Monoprice Monolith M15-S vs SVS PB-4000
- Monoprice Monolith M15-S vs HSU Research VTF-3 MK5 HP
- Monoprice Monolith M15-S vs Rythmik FV15HP
- Monoprice Monolith M15-S vs Monoprice Monolith M-215
- Monoprice Monolith M15-S vs Reaction Audio PV-15X
- Monoprice Monolith M15-S vs Monoprice Monolith 16 THX Ultra
- See all 15 comparisons