Short answer: the Power Sound Audio (PSA) TRIAX if sound quality matters most, the Rythmik F18 if price matters most. The Power Sound Audio (PSA) TRIAX ranks #5 of 110 subwoofers, rated 4.5/5, at $7995. The Rythmik F18 ranks #69, rated 4.1/5, at $2344, $5651 cheaper.
Buy the Power Sound Audio (PSA) TRIAX if sound quality matters more than the price. Buy the Rythmik F18 if the price matters more than sound quality.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Power Sound Audio (PSA) TRIAX | Rythmik F18 | |
|---|---|---|
| Price | $7995 | $1,850 |
| Ranked | #5 of 110 in Large Home Subwoofers (Over 75 lbs) | #69 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | sealed |
| Output SPL at 20 Hz | 119.8 dB | 106.2 dB |
| Output SPL at 25 Hz | 119.8 dB | 110.9 dB |
| Output SPL at 31.5 Hz | 119.8 dB | 114.3 dB |
| Output SPL at 40 Hz | 130.9 dB | 117.1 dB |
| Output SPL at 50 Hz | 130.9 dB | 119.1 dB |
| Output SPL at 63 Hz | 130.9 dB | 120.5 dB |
| CEA-2010-A Average (40-80Hz) | 130.9 dB (avg of 3/4 bands) | 119.5 dB |
| Dimensions | 23.5"H x 31"W x 27.5"D (596.9 x 787.4 x 698.5 mm) | 20.5"H x 20.5"W x 21"D (520.7 x 520.7 x 533.4 mm) |
| Weight | 229.9 lbs (104.3 kg) | 115.1 lbs (52.2 kg) |
| Warranty | 5 | 5/3 |
| Country | United States | United States |
| Measurement Source | Manufacturer | Data-bass |
| Drivers | 3x 15" (381mm) driver | 18" (457mm) driver |
| Inputs | XLR (balanced, with loop output) | XLR (2), RCA (line/LFE) |
| XLR Input | Yes | Yes |
| RCA Input | No | Yes |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | No |
| Output SPL at 10 Hz | - | 93.7 dB |
| Output SPL at 12.5 Hz | - | 97.4 dB |
| Output SPL at 15 Hz | - | 102.0 dB |
| Output SPL at 80 Hz | - | 121.2 dB |
| Output SPL at 100 Hz | - | 121.4 dB |
| Output SPL at 125 Hz | - | 121.4 dB |
| Cabinet Color | - | black |
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- JTR Speakers Captivator 4000ULF vs Power Sound Audio (PSA) TRIAX
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- JTR Speakers Captivator S2 vs Power Sound Audio (PSA) TRIAX
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
Power Sound Audio (PSA) TRIAX: $7995 eBay
Pros: Published CEA-2010 specifications list 119.8 dB at 20 Hz and 130.9 dB (avg of 3/4 bands) through 40-80 Hz. The sealed enclosure with 3x 15” (381mm) driver has the headroom for demanding film bass in a large room.
Cons: The 596.9H x 787.4W x 698.5D mm cabinet and 104.3 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
Full Power Sound Audio (PSA) TRIAX review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 130.9 dB (avg of 3/4 bands) |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 23.5"H x 31"W x 27.5"D (596.9 x 787.4 x 698.5 mm) |
| Drivers | 3x 15" (381mm) driver |
| Enclosure | sealed |
| HDMI Input | No |
| Inputs | XLR (balanced, with loop output) |
| Measurement Source | Manufacturer |
| Optical Input | No |
| 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 |
| RCA Input | No |
| TRS Input | No |
| USB Input | No |
| Warranty | 5 |
| Weight | 229.9 lbs (104.3 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
- Power Sound Audio (PSA) TRIAX vs JTR Speakers Captivator 4000ULF
- Power Sound Audio (PSA) TRIAX vs JTR Speakers Captivator 215PRO
- 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 S2
- Power Sound Audio (PSA) TRIAX vs Monoprice Monolith 16 THX Ultra
- Power Sound Audio (PSA) TRIAX vs Reaction Audio PV-15X
- Power Sound Audio (PSA) TRIAX vs Monoprice Monolith M-215
- See all 14 comparisons
Rythmik F18: $1,850 Rythmik Audio eBay
Pros: Independent CEA-2010 testing records 106.2 dB at 20 Hz and 119.5 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.
Cons: The 520.7H x 520.7W x 533.4D mm cabinet and 52.2 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
Full Rythmik F18 review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 119.5 dB |
| Cabinet Color | black |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 20.5"H x 20.5"W x 21"D (520.7 x 520.7 x 533.4 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | sealed |
| HDMI Input | No |
| Inputs | XLR (2), RCA (line/LFE) |
| Measurement Source | Data-bass |
| Optical Input | No |
| Output SPL at 10 Hz | 93.7 dB |
| Output SPL at 12.5 Hz | 97.4 dB |
| Output SPL at 15 Hz | 102.0 dB |
| Output SPL at 20 Hz | 106.2 dB |
| Output SPL at 25 Hz | 110.9 dB |
| Output SPL at 31.5 Hz | 114.3 dB |
| Output SPL at 40 Hz | 117.1 dB |
| Output SPL at 50 Hz | 119.1 dB |
| Output SPL at 63 Hz | 120.5 dB |
| Output SPL at 80 Hz | 121.2 dB |
| Output SPL at 100 Hz | 121.4 dB |
| Output SPL at 125 Hz | 121.4 dB |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5/3 |
| Weight | 115.1 lbs (52.2 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Rythmik F18 vs Perlisten Audio R212s
- Rythmik F18 vs Monoprice Monolith M15-S
- Rythmik F18 vs Monoprice Monolith M-15 V2
- Rythmik F18 vs SVS PB-4000
- Rythmik F18 vs HSU Research VTF-3 MK5 HP
- Rythmik F18 vs HSU Research VTF-15H MK2
- Rythmik F18 vs Rythmik FV15HP
- Rythmik F18 vs HSU Research VTF-3 MK3
- See all 24 comparisons