Short answer: the Monoprice Monolith 16 THX Ultra for the higher ranking, the Monoprice Monolith M-15 V2 for the lower price. The Monoprice Monolith 16 THX Ultra ranks #13 of 97 subwoofers at $2300. The Monoprice Monolith M-15 V2 ranks #55 at $1500, $800 cheaper.
What the Monoprice Monolith 16 THX Ultra gets right: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked. The catch: Heavy at 78 kg and ported design can interact with room acoustics.
Buy the Monoprice Monolith 16 THX Ultra if the ranking matters more than the price. Buy the Monoprice Monolith M-15 V2 if the price matters more than the ranking.
Specifications Side By Side
| Monoprice Monolith 16 THX Ultra | Monoprice Monolith M-15 V2 | |
|---|---|---|
| Price | $2,300 | $1,500 |
| Ranked | #13 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #55 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Output SPL at 15 Hz | 107.3 dB | 106.3 dB |
| Output SPL at 20 Hz | 118.4 dB | 112.6 dB |
| Output SPL at 25 Hz | 123.3 dB | 116.6 dB |
| Output SPL at 31.5 Hz | 125.1 dB | 119.5 dB |
| Output SPL at 40 Hz | 126.3 dB | 120.9 dB |
| Output SPL at 50 Hz | 126.5 dB | 120.6 dB |
| Output SPL at 63 Hz | 126.6 dB | 120.0 dB |
| Output SPL at 80 Hz | 126.8 dB | 118.7 dB |
| Output SPL at 100 Hz | 127.2 dB | 120.1 dB |
| Output SPL at 125 Hz | 127.6 dB | 120.2 dB |
| CEA-2010-A Average (40-80Hz) | 126.5 dB | 120.0 dB |
| Dimensions | 25.6"H x 22.0"W x 28.1"D (650.2 x 558.8 x 713.7 mm) | 28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm) |
| Weight | 171.5 lbs / 77.8 kg | 132.9 lbs / 60.3 kg |
| Warranty | 5 | 5 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Manufacturer |
| Drivers | 16" (406mm) driver | 15" (381mm) driver |
| Output SPL at 12.5 Hz | - | 91.0 dB |
The Two Speakers In Full
Monoprice Monolith 16 THX Ultra: $2,300
Pros: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it.
Cons: Heavy at 78 kg and ported design can interact with room acoustics.
Notes: Product # 42031
| CEA-2010-A Average (40-80Hz) | 126.5 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 25.6"H x 22.0"W x 28.1"D (650.2 x 558.8 x 713.7 mm) |
| Drivers | 16" (406mm) driver |
| Enclosure | ported, front |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 107.3 dB |
| Output SPL at 20 Hz | 118.4 dB |
| Output SPL at 25 Hz | 123.3 dB |
| Output SPL at 31.5 Hz | 125.1 dB |
| Output SPL at 40 Hz | 126.3 dB |
| Output SPL at 50 Hz | 126.5 dB |
| Output SPL at 63 Hz | 126.6 dB |
| Output SPL at 80 Hz | 126.8 dB |
| Output SPL at 100 Hz | 127.2 dB |
| Output SPL at 125 Hz | 127.6 dB |
| Warranty | 5 |
| Weight | 171.5 lbs / 77.8 kg |
- Head-to-Head Comparisons
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- Monoprice Monolith 16 THX Ultra vs JTR Speakers Captivator 2400
- Monoprice Monolith 16 THX Ultra vs Reaction Audio PV-15X
- Monoprice Monolith 16 THX Ultra vs Monoprice Monolith M-215
- Monoprice Monolith 16 THX Ultra vs JTR Speakers Captivator S2
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- See all 18 comparisons
- Links
Monoprice Monolith M-15 V2: $1,500 Amazon
Notes: Product # 42851
| CEA-2010-A Average (40-80Hz) | 120.0 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, front |
| Measurement Source | Manufacturer |
| Output SPL at 12.5 Hz | 91.0 dB |
| Output SPL at 15 Hz | 106.3 dB |
| Output SPL at 20 Hz | 112.6 dB |
| Output SPL at 25 Hz | 116.6 dB |
| Output SPL at 31.5 Hz | 119.5 dB |
| Output SPL at 40 Hz | 120.9 dB |
| Output SPL at 50 Hz | 120.6 dB |
| Output SPL at 63 Hz | 120.0 dB |
| Output SPL at 80 Hz | 118.7 dB |
| Output SPL at 100 Hz | 120.1 dB |
| Output SPL at 125 Hz | 120.2 dB |
| Warranty | 5 |
| Weight | 132.9 lbs / 60.3 kg |
- Head-to-Head Comparisons
- Monoprice Monolith M-15 V2 vs SVS PB-4000
- Monoprice Monolith M-15 V2 vs Rythmik F18
- Monoprice Monolith M-15 V2 vs Monoprice Monolith M15-S
- Monoprice Monolith M-15 V2 vs HSU Research VTF-3 MK5 HP
- Monoprice Monolith M-15 V2 vs HSU Research VTF-15H MK2
- Monoprice Monolith M-15 V2 vs Rythmik FV15HP
- Monoprice Monolith M-15 V2 vs Monoprice Monolith M-215
- Monoprice Monolith M-15 V2 vs Reaction Audio PV-15X
- 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.