Short answer: the HSU Research VTF-3 MK5 HP for the higher ranking, the Monoprice Monolith M15-S for the lower price. The HSU Research VTF-3 MK5 HP ranks #43 of 97 subwoofers at $1099. The Monoprice Monolith M15-S ranks #62 at $999, $100 cheaper.
On the HSU Research VTF-3 MK5 HP side: Ported cabinet delivers 121.4dB CEA-2010-A average, one of the best price-to-output ratios in this weight class. Set against that: Ported design requires careful room placement, mid-size 39 kg cabinet, and mid-range output.
Buy the HSU Research VTF-3 MK5 HP if the ranking matters more than the price. Buy the Monoprice Monolith M15-S if the price matters more than the ranking.
Specifications Side By Side
| HSU Research VTF-3 MK5 HP | Monoprice Monolith M15-S | |
|---|---|---|
| Price | $1,099 | $999 |
| Ranked | #43 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #62 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 15 Hz | 100.8 dB | 100.1 dB |
| Output SPL at 20 Hz | 108.2 dB | 105.6 dB |
| Output SPL at 25 Hz | 113.4 dB | 111.2 dB |
| Output SPL at 31.5 Hz | 118.2 dB | 115.2 dB |
| Output SPL at 40 Hz | 121.9 dB | 118.4 dB |
| Output SPL at 50 Hz | 122.3 dB | 119.3 dB |
| Output SPL at 63 Hz | 121.1 dB | 119.6 dB |
| Output SPL at 80 Hz | 120.4 dB | 118.9 dB |
| CEA-2010-A Average (40-80Hz) | 121.4 dB | 119.0 dB |
| Dimensions | 25.0"H x 17.25"W x 24.0"D (635.0 x 438.1 x 609.6 mm) | 23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm) |
| Weight | 85.1 lbs / 38.6 kg | 80 lbs / 36.3 kg |
| Warranty | 7/2(+3) | 5 |
| Cabinet Color | black | - |
| 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 |
The Two Speakers In Full
HSU Research VTF-3 MK5 HP: $1,099
Pros: Ported cabinet delivers 121.4dB CEA-2010-A average, one of the best price-to-output ratios in this weight class.
Cons: Ported design requires careful room placement, mid-size 39 kg cabinet, and mid-range output.
Notes: Price includes shipping
| CEA-2010-A Average (40-80Hz) | 121.4 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 25.0"H x 17.25"W x 24.0"D (635.0 x 438.1 x 609.6 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, front |
| Measurement Source | Manufacturer |
| Output SPL at 15 Hz | 100.8 dB |
| Output SPL at 20 Hz | 108.2 dB |
| Output SPL at 25 Hz | 113.4 dB |
| Output SPL at 31.5 Hz | 118.2 dB |
| Output SPL at 40 Hz | 121.9 dB |
| Output SPL at 50 Hz | 122.3 dB |
| Output SPL at 63 Hz | 121.1 dB |
| Output SPL at 80 Hz | 120.4 dB |
| Warranty | 7/2(+3) |
| Weight | 85.1 lbs / 38.6 kg |
- Head-to-Head Comparisons
- HSU Research VTF-3 MK5 HP vs HSU Research VTF-15H MK2
- HSU Research VTF-3 MK5 HP vs Rythmik FV15HP
- HSU Research VTF-3 MK5 HP vs SVS PB-4000
- HSU Research VTF-3 MK5 HP vs Monoprice Monolith M-15 V2
- HSU Research VTF-3 MK5 HP vs Rythmik F18
- HSU Research VTF-3 MK5 HP vs Monoprice Monolith M-215
- HSU Research VTF-3 MK5 HP vs Reaction Audio PV-15X
- HSU Research VTF-3 MK5 HP vs Monoprice Monolith 16 THX Ultra
- See all 16 comparisons
- Links
Monoprice Monolith M15-S: $999
Notes: Product # 35141
| 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 |
- 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-15H MK2
- 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
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.