Short answer: the Power Sound Audio (PSA) TRIAX for the higher ranking, the Monoprice Monolith 16 THX Ultra for the lower price. The Power Sound Audio (PSA) TRIAX ranks #3 of 97 subwoofers at $7995. The Monoprice Monolith 16 THX Ultra ranks #13 at $2300, $5695 cheaper.
The case for the Monoprice Monolith 16 THX Ultra: 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 price matters more than the ranking. Buy the Power Sound Audio (PSA) TRIAX if the ranking matters more than the price.
Specifications Side By Side
| Monoprice Monolith 16 THX Ultra | Power Sound Audio (PSA) TRIAX | |
|---|---|---|
| Price | $2,300 | $7995 |
| Ranked | #13 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #3 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 15 Hz | 107.3 dB | - |
| Output SPL at 20 Hz | 118.4 dB | 119.8 dB |
| Output SPL at 25 Hz | 123.3 dB | 119.8 dB |
| Output SPL at 31.5 Hz | 125.1 dB | 119.8 dB |
| Output SPL at 40 Hz | 126.3 dB | 130.9 dB |
| Output SPL at 50 Hz | 126.5 dB | 130.9 dB |
| Output SPL at 63 Hz | 126.6 dB | 130.9 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 | - |
| CEA-2010-A Average (40-80Hz) | 126.5 dB | 130.9 dB (avg of 3/4 bands) |
| Dimensions | 25.6"H x 22.0"W x 28.1"D (650.2 x 558.8 x 713.7 mm) | 23.5"H x 31.0"W x 27.5"D (596.9 x 787.4 x 698.5 mm) |
| Weight | 171.5 lbs / 77.8 kg | 229.9 lbs / 104.3 kg |
| Warranty | 5 | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Audioholics | Manufacturer |
| Drivers | 16" (406mm) driver | 3x 15" (381mm) driver |
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 Reaction Audio PV-15X
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- See all 18 comparisons
- Links
Power Sound Audio (PSA) TRIAX: $7995
| CEA-2010-A Average (40-80Hz) | 130.9 dB (avg of 3/4 bands) |
|---|---|
| Country | United States |
| Dimensions | 23.5"H x 31.0"W x 27.5"D (596.9 x 787.4 x 698.5 mm) |
| Drivers | 3x 15" (381mm) driver |
| Enclosure | sealed |
| Measurement Source | Manufacturer |
| Output SPL at 20 Hz | 119.8 dB |
| Output SPL at 25 Hz | 119.8 dB |
| Output SPL at 31.5 Hz | 119.8 dB |
| Output SPL at 40 Hz | 130.9 dB |
| Output SPL at 50 Hz | 130.9 dB |
| Output SPL at 63 Hz | 130.9 dB |
| Warranty | 5 |
| Weight | 229.9 lbs / 104.3 kg |
- Head-to-Head Comparisons
- Power Sound Audio (PSA) TRIAX vs JTR Speakers Captivator 4000ULF
- Power Sound Audio (PSA) TRIAX vs JTR Speakers Orbit Shifter LFU
- Power Sound Audio (PSA) TRIAX vs JTR Speakers Orbit Shifter PRO
- Power Sound Audio (PSA) TRIAX vs JTR Speakers Captivator 215PRO
- Power Sound Audio (PSA) TRIAX vs JTR Speakers Captivator S2
- Power Sound Audio (PSA) TRIAX vs Reaction Audio PV-15X
- Power Sound Audio (PSA) TRIAX vs Monoprice Monolith M-215
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- 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.